.. ------------------------------------------------------------------- NOTE: This file is automatically generated by running clang-tblgen -gen-opt-docs. Do not edit this file by hand!! ------------------------------------------------------------------- ===================================== Clang command line argument reference ===================================== .. contents:: :local: Introduction ============ This page lists the command line arguments currently supported by the GCC-compatible ``clang`` and ``clang++`` drivers. .. program:: clang .. option:: -B<prefix>, --prefix <arg>, --prefix=<arg> Search $prefix/$triple-$file and $prefix$file for executables, libraries, includes, and data files used by the compiler. $prefix may or may not be a directory .. option:: -F<arg> Add directory to framework include search path .. option:: -ObjC Treat source input files as Objective-C inputs .. program:: clang1 .. option:: -ObjC++ .. program:: clang Treat source input files as Objective-C++ inputs .. option:: -Qn, -fno-ident Do not emit metadata containing compiler name and version .. option:: -Qunused-arguments Don't emit warning for unused driver arguments .. option:: -Qy, -fident Emit metadata containing compiler name and version .. option:: -Wa,<arg>,<arg2>... Pass the comma separated arguments in <arg> to the assembler .. option:: -Wlarge-by-value-copy=<arg> .. option:: -Xarch\_<arg1> <arg2> .. program:: clang1 .. option:: -Xarch\_device <arg> .. program:: clang Pass <arg> to the CUDA/HIP device compilation .. program:: clang2 .. option:: -Xarch\_host <arg> .. program:: clang Pass <arg> to the CUDA/HIP host compilation .. option:: -Xcuda-fatbinary <arg> Pass <arg> to fatbinary invocation .. option:: -Xcuda-ptxas <arg> Pass <arg> to the ptxas assembler .. option:: -Xopenmp-target <arg> Pass <arg> to the target offloading toolchain. .. program:: clang1 .. option:: -Xopenmp-target=<triple> <arg> .. program:: clang Pass <arg> to the target offloading toolchain identified by <triple>. .. option:: -Z<arg> .. option:: -a<arg>, --profile-blocks .. option:: -all\_load .. option:: -allowable\_client <arg> .. option:: --analyze Run the static analyzer .. option:: --analyzer-no-default-checks .. option:: --analyzer-output<arg> Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|sarif\|sarif-html\|text). .. option:: -arch <arg> .. program:: clang1 .. option:: -arch\_errors\_fatal .. program:: clang .. program:: clang2 .. option:: -arch\_only <arg> .. program:: clang .. option:: -arcmt-migrate-emit-errors Emit ARC errors even if the migrator can fix them .. option:: -arcmt-migrate-report-output <arg> Output path for the plist report .. option:: --autocomplete=<arg> .. option:: -bind\_at\_load .. option:: -bundle .. program:: clang1 .. option:: -bundle\_loader <arg> .. program:: clang .. option:: -client\_name<arg> .. option:: -compatibility\_version<arg> .. option:: --config <arg> Specifies configuration file .. option:: --constant-cfstrings .. option:: --cuda-compile-host-device Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. .. option:: --cuda-device-only Compile CUDA code for device only .. option:: --cuda-host-only Compile CUDA code for host only. Has no effect on non-CUDA compilations. .. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. .. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug Enable device-side debug info generation. Disables ptxas optimizations. .. option:: -cuid=<arg> An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. It is used to externalize device-side static variables for single source offloading languages CUDA and HIP so that they can be accessed by the host code of the same compilation unit. .. option:: -current\_version<arg> .. option:: -dead\_strip .. option:: -dependency-dot <arg> Filename to write DOT-formatted header dependencies to .. option:: -dependency-file <arg> Filename (or -) to write dependency output to .. option:: -dsym-dir<dir> Directory to output dSYM's (if any) to .. option:: -dumpmachine .. option:: -dumpversion .. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> .. option:: -dylib\_file <arg> .. option:: -dylinker .. program:: clang1 .. option:: -dylinker\_install\_name<arg> .. program:: clang .. option:: -dynamic .. option:: -dynamiclib .. option:: -emit-ast Emit Clang AST files for source inputs .. option:: --emit-static-lib Enable linker job to emit a static library. .. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang Trivial automatic variable initialization to zero is only here for benchmarks, it'll eventually be removed, and I'm OK with that because I'm only using it to benchmark .. option:: -exported\_symbols\_list <arg> .. option:: -faligned-new=<arg> .. option:: -ffixed-r19 Reserve register r19 (Hexagon only) .. option:: -fgpu-flush-denormals-to-zero, -fcuda-flush-denormals-to-zero, -fno-gpu-flush-denormals-to-zero Flush denormal floating point values to zero in CUDA/HIP device mode. .. option:: -fheinous-gnu-extensions .. option:: -flat\_namespace .. option:: -fopenmp-targets=<arg1>,<arg2>... Specify comma-separated list of triples OpenMP offloading targets to be supported .. option:: -force\_cpusubtype\_ALL .. program:: clang1 .. option:: -force\_flat\_namespace .. program:: clang .. program:: clang2 .. option:: -force\_load <arg> .. program:: clang .. option:: -framework <arg> .. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath Add -rpath with architecture-specific resource directory to the linker flags .. option:: -fsanitize-system-ignorelist=<arg>, -fsanitize-system-blacklist=<arg> Path to system ignorelist file for sanitizers .. option:: -fshow-skipped-includes #include files may be "skipped" due to include guard optimization or #pragma once. This flag makes -H show also such includes. .. option:: -fsystem-module Build this module as a system module. Only used with -emit-module .. option:: -fuse-cuid=<arg> Method to generate ID's for compilation units for single source offloading languages CUDA and HIP: 'hash' (ID's generated by hashing file path and command line options) \| 'random' (ID's generated as random numbers) \| 'none' (disabled). Default is 'hash'. This option will be overriden by option '-cuid=\[ID\]' if it is specified. .. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> Search for GCC installation in the specified directory on targets which commonly use GCC. The directory usually contains 'lib{,32,64}/gcc{,-cross}/$triple' and 'include'. If specified, sysroot is skipped for GCC detection. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation .. option:: -gcodeview Generate CodeView debug information .. option:: -gcodeview-ghash, -gno-codeview-ghash Emit type record hashes in a .debug$H section .. option:: --gpu-instrument-lib=<arg> Instrument device library for HIP, which is a LLVM bitcode containing \_\_cyg\_profile\_func\_enter and \_\_cyg\_profile\_func\_exit .. option:: --gpu-max-threads-per-block=<arg> Default max threads per block for kernel launch bounds for HIP .. option:: -headerpad\_max\_install\_names<arg> .. option:: -help, --help Display available options .. option:: --help-hidden Display help for hidden options .. option:: --hip-link Link clang-offload-bundler bundles for HIP .. option:: --hip-version=<arg> HIP version in the format of major.minor.patch .. option:: -ibuiltininc Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it .. option:: -image\_base <arg> .. option:: -index-header-map Make the next included directory (-I or -F) an indexer header map .. option:: -init <arg> .. option:: -install\_name <arg> .. option:: -interface-stub-version=<arg> .. option:: -keep\_private\_externs .. option:: -lazy\_framework <arg> .. program:: clang1 .. option:: -lazy\_library <arg> .. program:: clang .. option:: -mbig-endian, -EB .. option:: -mbranch-protection=<arg> Enforce targets of indirect branches and function returns .. option:: -menable-unsafe-fp-math Allow unsafe floating-point math optimizations which may decrease precision .. option:: -mharden-sls=<arg> Select straight-line speculation hardening scope .. option:: --migrate Run the migrator .. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> .. option:: -mlinker-version=<arg> .. option:: -mlittle-endian, -EL .. option:: -mllvm <arg> Additional arguments to forward to LLVM's option processing .. option:: -module-dependency-dir <arg> Directory to dump module dependencies to .. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> .. option:: -multi\_module .. option:: -multiply\_defined <arg> .. program:: clang1 .. option:: -multiply\_defined\_unused <arg> .. program:: clang .. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> .. option:: --no-cuda-version-check Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. .. option:: -no-integrated-cpp, --no-integrated-cpp .. option:: -no\_dead\_strip\_inits\_and\_terms .. option:: -nobuiltininc Disable builtin #include directories .. option:: -nodefaultlibs .. option:: -nofixprebinding .. option:: -nogpuinc, -nocudainc Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers .. option:: -nogpulib, -nocudalib Do not link device library for CUDA/HIP device compilation .. option:: -nolibc .. option:: -nomultidefs .. option:: -nopie, -no-pie .. option:: -noprebind .. option:: -noprofilelib .. option:: -noseglinkedit .. option:: -nostdinc, --no-standard-includes .. program:: clang1 .. option:: -nostdinc++ .. program:: clang Disable standard #include directories for the C++ standard library .. option:: -nostdlib++ .. option:: -nostdlibinc .. option:: -o<file>, --output <arg>, --output=<arg> Write output to <file> .. option:: -objcmt-atomic-property Make migration to 'atomic' properties .. option:: -objcmt-migrate-all Enable migration to modern ObjC .. option:: -objcmt-migrate-annotation Enable migration to property and method annotations .. option:: -objcmt-migrate-designated-init Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods .. option:: -objcmt-migrate-instancetype Enable migration to infer instancetype for method result type .. option:: -objcmt-migrate-literals Enable migration to modern ObjC literals .. option:: -objcmt-migrate-ns-macros Enable migration to NS\_ENUM/NS\_OPTIONS macros .. option:: -objcmt-migrate-property Enable migration to modern ObjC property .. option:: -objcmt-migrate-property-dot-syntax Enable migration of setter/getter messages to property-dot syntax .. option:: -objcmt-migrate-protocol-conformance Enable migration to add protocol conformance on classes .. option:: -objcmt-migrate-readonly-property Enable migration to modern ObjC readonly property .. option:: -objcmt-migrate-readwrite-property Enable migration to modern ObjC readwrite property .. option:: -objcmt-migrate-subscripting Enable migration to modern ObjC subscripting .. option:: -objcmt-ns-nonatomic-iosonly Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute .. option:: -objcmt-returns-innerpointer-property Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER .. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> Only modify files with a filename contained in the provided directory path .. option:: -object .. option:: --offload-arch=<arg>, --cuda-gpu-arch=<arg>, --no-offload-arch=<arg> CUDA offloading device architecture (e.g. sm\_35), or HIP offloading target ID in the form of a device architecture followed by target ID features delimited by a colon. Each target ID feature is a pre-defined string followed by a plus or minus sign (e.g. gfx908:xnack+:sramecc-). May be specified more than once. .. option:: -p, --profile .. option:: -pagezero\_size<arg> .. option:: -pg Enable mcount instrumentation .. option:: -pipe, --pipe Use pipes between commands, when possible .. option:: -prebind .. program:: clang1 .. option:: -prebind\_all\_twolevel\_modules .. program:: clang .. option:: -preload .. option:: --print-diagnostic-categories .. option:: -print-effective-triple, --print-effective-triple Print the effective target triple .. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> Print the full library path of <file> .. option:: -print-ivar-layout Enable Objective-C Ivar layout bitmap print trace .. option:: -print-libgcc-file-name, --print-libgcc-file-name Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") .. option:: -print-multi-directory, --print-multi-directory .. option:: -print-multi-lib, --print-multi-lib .. option:: -print-multiarch, --print-multiarch Print the multiarch target triple .. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> Print the full program path of <name> .. option:: -print-resource-dir, --print-resource-dir Print the resource directory pathname .. option:: -print-rocm-search-dirs, --print-rocm-search-dirs Print the paths used for finding ROCm installation .. option:: -print-runtime-dir, --print-runtime-dir Print the directory pathname containing clangs runtime libraries .. option:: -print-search-dirs, --print-search-dirs Print the paths used for finding libraries and programs .. option:: -print-target-triple, --print-target-triple Print the normalized target triple .. option:: -print-targets, --print-targets Print the registered targets .. option:: -private\_bundle .. option:: -pthread, -no-pthread Support POSIX threads in generated code .. option:: -pthreads .. option:: -read\_only\_relocs <arg> .. option:: -relocatable-pch, --relocatable-pch Whether to build a relocatable precompiled header .. option:: -remap .. option:: -rewrite-legacy-objc Rewrite Legacy Objective-C source to C++ .. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> Compiler runtime library to use .. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) Save llvm statistics. .. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) Save intermediate compilation results. .. option:: -sectalign <arg1> <arg2> <arg3> .. option:: -sectcreate <arg1> <arg2> <arg3> .. option:: -sectobjectsymbols <arg1> <arg2> .. option:: -sectorder <arg1> <arg2> <arg3> .. option:: -seg1addr<arg> .. option:: -seg\_addr\_table <arg> .. program:: clang1 .. option:: -seg\_addr\_table\_filename <arg> .. program:: clang .. option:: -segaddr <arg1> <arg2> .. option:: -segcreate <arg1> <arg2> <arg3> .. option:: -seglinkedit .. option:: -segprot <arg1> <arg2> <arg3> .. option:: -segs\_read\_<arg> .. program:: clang1 .. option:: -segs\_read\_only\_addr <arg> .. program:: clang .. program:: clang2 .. option:: -segs\_read\_write\_addr <arg> .. program:: clang .. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> Serialize compiler diagnostics to a file .. option:: -shared-libgcc .. option:: -shared-libsan, -shared-libasan Dynamically link the sanitizer runtime .. option:: -single\_module .. option:: -static-libgcc .. option:: -static-libsan Statically link the sanitizer runtime .. option:: -static-libstdc++ .. option:: -static-openmp Use the static host OpenMP runtime while linking. .. option:: -std-default=<arg> .. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> C++ standard library to use .. option:: -sub\_library<arg> .. program:: clang1 .. option:: -sub\_umbrella<arg> .. program:: clang .. option:: --sysroot=<arg>, --sysroot <arg> .. option:: --target-help .. option:: --target=<arg>, -target <arg> Generate code for the given target .. option:: -time Time individual commands .. option:: -traditional, --traditional .. option:: -traditional-cpp, --traditional-cpp Enable some traditional CPP emulation .. option:: -twolevel\_namespace .. program:: clang1 .. option:: -twolevel\_namespace\_hints .. program:: clang .. option:: -umbrella <arg> .. option:: -unexported\_symbols\_list <arg> .. option:: -unwindlib=<arg>, --unwindlib=<arg> Unwind library to use .. option:: -v, --verbose Show commands to run and use verbose output .. option:: --verify-debug-info Verify the binary representation of debug output .. option:: --version Print version information .. option:: -w, --no-warnings Suppress all warnings .. option:: -weak-l<arg> .. option:: -weak\_framework <arg> .. program:: clang1 .. option:: -weak\_library <arg> .. program:: clang .. program:: clang2 .. option:: -weak\_reference\_mismatches <arg> .. program:: clang .. option:: -whatsloaded .. option:: -why\_load, -whyload .. option:: -working-directory<arg>, -working-directory=<arg> Resolve file paths relative to the specified directory .. option:: -x<language>, --language <arg>, --language=<arg> Treat subsequent input files as having type <language> .. option:: -y<arg> Actions ======= The action to perform on the input. .. option:: -E, --preprocess Only run the preprocessor .. option:: -S, --assemble Only run preprocess and compilation steps .. option:: -c, --compile Only run preprocess, compile, and assemble steps .. option:: -emit-interface-stubs Generate Interface Stub Files. .. option:: -emit-llvm Use the LLVM representation for assembler and object files .. option:: -emit-merged-ifs Generate Interface Stub Files, emit merged text not binary. .. option:: -fsyntax-only .. option:: -module-file-info Provide information about a particular module file .. option:: --precompile Only precompile the input .. option:: -rewrite-objc Rewrite Objective-C source to C++ .. option:: -verify-pch Load and verify that a pre-compiled header file is not stale Compilation flags ================= Flags controlling the behavior of Clang during compilation. These flags have no effect during actions that do not perform compilation. .. option:: -Xassembler <arg> Pass <arg> to the assembler .. option:: -Xclang <arg> Pass <arg> to the clang compiler .. option:: -ansi, --ansi .. option:: -fc++-abi=<arg> C++ ABI to use. This will override the target C++ ABI. .. option:: -fclang-abi-compat=<version> Attempt to match the ABI of Clang <version> .. option:: -fcomment-block-commands=<arg>,<arg2>... Treat each comma separated argument in <arg> as a documentation comment block command .. option:: -fcomplete-member-pointers, -fno-complete-member-pointers Require member pointer base types to be complete if they would be significant under the Microsoft ABI .. option:: -fcrash-diagnostics-dir=<dir> Put crash-report files in <dir> .. option:: -fdeclspec, -fno-declspec Allow \_\_declspec as a keyword .. option:: -fdepfile-entry=<arg> .. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info .. option:: -fdiagnostics-format=<arg> .. option:: -fdiagnostics-parseable-fixits Print fix-its in machine parseable form .. option:: -fdiagnostics-print-source-range-info Print source range spans in numeric form .. option:: -fdiagnostics-show-category=<arg> .. option:: -fdiscard-value-names, -fno-discard-value-names Discard value names in LLVM IR .. option:: -fexperimental-relative-c++-abi-vtables, -fno-experimental-relative-c++-abi-vtables Use the experimental C++ class ABI for classes with virtual tables .. option:: -fexperimental-strict-floating-point Enables experimental strict floating point in LLVM. .. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses Use separate accesses for consecutive bitfield runs with legal widths and alignments. .. option:: -fglobal-isel, -fexperimental-isel, -fno-global-isel Enables the global instruction selector .. option:: -finline-functions, -fno-inline-functions Inline suitable functions .. option:: -finline-hint-functions Inline functions which are (explicitly or implicitly) marked inline .. option:: -flegacy-pass-manager, -fno-experimental-new-pass-manager, -fno-legacy-pass-manager Use the legacy pass manager in LLVM .. option:: -fno-crash-diagnostics Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash .. option:: -fno-sanitize-ignorelist, -fno-sanitize-blacklist Don't use ignorelist file for sanitizers .. option:: -fparse-all-comments .. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches .. option:: -fsanitize-address-destructor=<arg> Set destructor type used in ASan instrumentation .. option:: -fsanitize-address-field-padding=<arg> Level of field padding for AddressSanitizer .. option:: -fsanitize-address-globals-dead-stripping Enable linker dead stripping of globals in AddressSanitizer .. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer .. option:: -fsanitize-address-use-after-return=<mode> Select the mode of detecting stack use-after-return in AddressSanitizer .. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope Enable use-after-scope detection in AddressSanitizer .. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size .. option:: -fsanitize-cfi-canonical-jump-tables, -fno-sanitize-cfi-canonical-jump-tables Make the jump table addresses canonical in the symbol table .. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso Enable control flow integrity (CFI) checks for cross-DSO calls. .. option:: -fsanitize-cfi-icall-generalize-pointers Generalize pointers in CFI indirect call type signature checks .. option:: -fsanitize-coverage-allowlist=<arg>, -fsanitize-coverage-whitelist=<arg> Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones .. option:: -fsanitize-coverage-ignorelist=<arg>, -fsanitize-coverage-blacklist=<arg> Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones .. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... Specify the type of coverage instrumentation for Sanitizers .. option:: -fsanitize-hwaddress-abi=<arg> Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused. .. option:: -fsanitize-hwaddress-experimental-aliasing, -fno-sanitize-hwaddress-experimental-aliasing Enable aliasing mode in HWAddressSanitizer .. option:: -fsanitize-ignorelist=<arg>, -fsanitize-blacklist=<arg> Path to ignorelist file for sanitizers .. option:: -fsanitize-link-c++-runtime, -fno-sanitize-link-c++-runtime .. option:: -fsanitize-link-runtime, -fno-sanitize-link-runtime .. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins Enable origins tracking in MemorySanitizer .. program:: clang1 .. option:: -fsanitize-memory-track-origins=<arg> .. program:: clang Enable origins tracking in MemorySanitizer .. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor Enable use-after-destroy detection in MemorySanitizer .. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime .. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>..., -fsanitize-recover (equivalent to -fsanitize-recover=all) Enable recovery for specified sanitizers .. option:: -fsanitize-stats, -fno-sanitize-stats Enable sanitizer statistics gathering. .. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics Enable atomic operations instrumentation in ThreadSanitizer (default) .. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit Enable function entry/exit instrumentation in ThreadSanitizer (default) .. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access Enable memory access instrumentation in ThreadSanitizer (default) .. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>..., -fsanitize-trap (equivalent to -fsanitize-trap=all), -fsanitize-undefined-trap-on-error (equivalent to -fsanitize-trap=undefined) Enable trapping for specified sanitizers .. option:: -fsanitize-undefined-strip-path-components=<number> Strip (or keep only, if negative) a given number of path components when emitting check metadata. .. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks .. option:: -moutline, -mno-outline Enable function outlining (AArch64 only) .. option:: -moutline-atomics, -mno-outline-atomics Generate local calls to out-of-line atomic operations .. option:: --param <arg>, --param=<arg> .. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) .. option:: -std=<arg>, --std=<arg>, --std <arg> Language standard to compile for Preprocessor flags ~~~~~~~~~~~~~~~~~~ Flags controlling the behavior of the Clang preprocessor. .. option:: -C, --comments Include comments in preprocessed output .. option:: -CC, --comments-in-macros Include comments from within macros in preprocessed output .. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> Define <macro> to <value> (or 1 if <value> omitted) .. option:: -H, --trace-includes Show header includes and nesting depth .. option:: -P, --no-line-commands Disable linemarker output in -E mode .. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> Undefine macro <macro> .. option:: -Wp,<arg>,<arg2>... Pass the comma separated arguments in <arg> to the preprocessor .. option:: -Xpreprocessor <arg> Pass <arg> to the preprocessor .. option:: -fmacro-prefix-map=<arg> remap file source paths in predefined preprocessor macros Include path management ----------------------- Flags controlling how ``#include``\s are resolved to files. .. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> Add directory to include search path. For C++ inputs, if there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. If the same directory is in the SYSTEM include search paths, for example if also specified with -isystem, the -I option will be ignored .. option:: -I-, --include-barrier Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path .. option:: --amdgpu-arch-tool=<arg> Tool used for detecting AMD GPU arch in the system. .. option:: --cuda-path-ignore-env Ignore environment variables to detect CUDA installation .. option:: --cuda-path=<arg> CUDA installation path .. option:: -cxx-isystem<directory> Add directory to the C++ SYSTEM include search path .. option:: -fbuild-session-file=<file> Use the last modification time of <file> as the build session timestamp .. option:: -fbuild-session-timestamp=<time since Epoch in seconds> Time when the current build session started .. option:: -fmodule-file=\[<name>=\]<file> Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. .. option:: -fmodules-cache-path=<directory> Specify the module cache path .. option:: -fmodules-disable-diagnostic-validation Disable validation of the diagnostic options when loading the module .. option:: -fmodules-prune-after=<seconds> Specify the interval (in seconds) after which a module file will be considered unused .. option:: -fmodules-prune-interval=<seconds> Specify the interval (in seconds) between attempts to prune the module cache .. option:: -fmodules-user-build-path <directory> Specify the module user build path .. option:: -fmodules-validate-once-per-build-session Don't verify input files for the modules if the module has been successfully validated or loaded during this build session .. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers Validate the system headers that a module depends on when loading the module .. option:: -fprebuilt-module-path=<directory> Specify the prebuilt module path .. option:: --hip-path=<arg> HIP runtime installation path, used for finding HIP version and adding HIP include path. .. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> Add directory to AFTER include search path .. option:: -iframework<arg> Add directory to SYSTEM framework search path .. option:: -iframeworkwithsysroot<directory> Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot .. option:: -imacros<file>, --imacros<file>, --imacros=<arg> Include macros from file before parsing .. option:: -include<file>, --include<file>, --include=<arg> Include file before parsing .. option:: -include-pch <file> Include precompiled header file .. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> Set the -iwithprefix/-iwithprefixbefore prefix .. option:: -iquote<directory> Add directory to QUOTE include search path .. option:: -isysroot<dir> Set the system root directory (usually /) .. option:: -isystem<directory> Add directory to SYSTEM include search path .. option:: -isystem-after<directory> Add directory to end of the SYSTEM include search path .. option:: -ivfsoverlay<arg> Overlay the virtual filesystem described by file over the real file system .. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> Set directory to SYSTEM include search path with prefix .. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> Set directory to include search path with prefix .. option:: -iwithsysroot<directory> Add directory to SYSTEM include search path, absolute paths are relative to -isysroot .. option:: --libomptarget-amdgcn-bc-path=<arg> Path to libomptarget-amdgcn bitcode library .. option:: --libomptarget-nvptx-bc-path=<arg> Path to libomptarget-nvptx bitcode library .. option:: --ptxas-path=<arg> Path to ptxas (used for compiling CUDA code) .. option:: --rocm-path=<arg> ROCm installation path, used for finding and automatically linking required bitcode libraries. .. program:: clang1 .. option:: -stdlib++-isystem<directory> .. program:: clang Use directory as the C++ standard library include path .. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> Treat all #include paths starting with <prefix> as including a system header. Dependency file generation -------------------------- Flags controlling generation of a dependency file for ``make``-like build systems. .. option:: -M, --dependencies Like -MD, but also implies -E and writes to stdout by default .. option:: -MD, --write-dependencies Write a depfile containing user and system headers .. option:: -MF<file> Write depfile output from -MMD, -MD, -MM, or -M to <file> .. option:: -MG, --print-missing-file-dependencies Add missing headers to depfile .. option:: -MJ<arg> Write a compilation database entry per input .. option:: -MM, --user-dependencies Like -MMD, but also implies -E and writes to stdout by default .. option:: -MMD, --write-user-dependencies Write a depfile containing user headers .. option:: -MP Create phony target for each dependency (other than main file) .. option:: -MQ<arg> Specify name of main file output to quote in depfile .. option:: -MT<arg> Specify name of main file output in depfile .. option:: -MV Use NMake/Jom format for the depfile Dumping preprocessor state -------------------------- Flags allowing the state of the preprocessor to be dumped in various ways. .. option:: -d .. program:: clang1 .. option:: -d<arg> .. program:: clang .. option:: -dD Print macro definitions in -E mode in addition to normal output .. option:: -dI Print include directives in -E mode in addition to normal output .. option:: -dM Print macro definitions in -E mode instead of normal output Diagnostic flags ~~~~~~~~~~~~~~~~ Flags controlling which warnings, errors, and remarks Clang will generate. See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. .. option:: -R<remark> Enable the specified remark .. option:: -Rpass-analysis=<arg> Report transformation analysis from optimization passes whose name matches the given POSIX regular expression .. option:: -Rpass-missed=<arg> Report missed transformations by optimization passes whose name matches the given POSIX regular expression .. option:: -Rpass=<arg> Report transformations performed by optimization passes whose name matches the given POSIX regular expression .. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> Enable the specified warning .. option:: -Wdeprecated, -Wno-deprecated Enable warnings for deprecated constructs and define \_\_DEPRECATED .. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> Target-independent compilation options ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. option:: -Wframe-larger-than=<arg> .. option:: -fPIC, -fno-PIC .. option:: -fPIE, -fno-PIE .. option:: -faccess-control, -fno-access-control .. option:: -faddrsig, -fno-addrsig Emit an address-significance table .. option:: -falign-functions, -fno-align-functions .. program:: clang1 .. option:: -falign-functions=<arg> .. program:: clang .. program:: clang1 .. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation .. program:: clang Enable C++17 aligned allocation functions .. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders Treat editor placeholders as valid source code .. option:: -fallow-unsupported .. option:: -faltivec, -fno-altivec .. option:: -fansi-escape-codes Use ANSI escape codes for diagnostics .. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables Use Apple's kernel extensions ABI .. option:: -fapple-link-rtlib Force linking the clang builtins runtime library .. option:: -fapple-pragma-pack, -fno-apple-pragma-pack Enable Apple gcc-compatible #pragma pack handling .. option:: -fapplication-extension, -fno-application-extension Restrict code to those available for App Extensions .. option:: -fasm, -fno-asm .. option:: -fasm-blocks, -fno-asm-blocks .. option:: -fassociative-math, -fno-associative-math .. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new .. option:: -fast .. option:: -fastcp .. option:: -fastf .. option:: -fasync-exceptions, -fno-async-exceptions Enable EH Asynchronous exceptions .. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables .. option:: -fautolink, -fno-autolink .. option:: -fbasic-block-sections=<arg> Generate labels for each basic block or place each basic block or a subset of basic blocks in its own section. .. option:: -fbinutils-version=<major.minor> Produced object files can use all ELF features supported by this binutils version and newer. If -fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means that all ELF features can be used, regardless of binutils support. Defaults to 2.26. .. option:: -fblocks, -fno-blocks Enable the 'blocks' language feature .. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> .. option:: -fborland-extensions, -fno-borland-extensions Accept non-standard constructs supported by the Borland compiler .. option:: -fbracket-depth=<arg> .. option:: -fbuiltin, -fno-builtin .. option:: -fbuiltin-module-map Load the clang builtins module map file. .. program:: clang1 .. option:: -fc++-static-destructors, -fno-c++-static-destructors .. program:: clang .. option:: -fcaret-diagnostics, -fno-caret-diagnostics .. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) Instrument control-flow architecture protection. Options: return, branch, full, none. .. option:: -fcf-runtime-abi=<arg> .. option:: -fchar8\_t, -fno-char8\_t Enable C++ builtin type char8\_t .. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> .. option:: -fcolor-diagnostics, -fno-color-diagnostics Enable colors in diagnostics .. option:: -fcommon, -fno-common Place uninitialized global variables in a common block .. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> .. option:: -fconstant-cfstrings, -fno-constant-cfstrings .. option:: -fconstant-string-class=<arg> .. option:: -fconstexpr-backtrace-limit=<arg> .. option:: -fconstexpr-depth=<arg> .. option:: -fconstexpr-steps=<arg> .. option:: -fconvergent-functions Assume functions may be convergent .. option:: -fcoroutines-ts, -fno-coroutines-ts Enable support for the C++ Coroutines TS .. option:: -fcoverage-compilation-dir=<arg> The compilation directory to embed in the coverage mapping. .. option:: -fcoverage-mapping, -fno-coverage-mapping Generate coverage mapping to enable code coverage analysis .. option:: -fcoverage-prefix-map=<arg> remap file source paths in coverage mapping .. option:: -fcreate-profile .. option:: -fcs-profile-generate Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) .. program:: clang1 .. option:: -fcs-profile-generate=<directory> .. program:: clang Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) .. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals Use approximate transcendental functions .. option:: -fcuda-short-ptr, -fno-cuda-short-ptr Use 32-bit pointers for accessing const/local/shared address spaces .. option:: -fcxx-exceptions, -fno-cxx-exceptions Enable C++ exceptions .. option:: -fcxx-modules, -fno-cxx-modules .. option:: -fdata-sections, -fno-data-sections Place each data in its own section .. option:: -fdebug-compilation-dir=<arg>, -fdebug-compilation-dir <arg> The compilation directory to embed in the debug info .. option:: -fdebug-default-version=<arg> Default DWARF version to use, if a -g option caused DWARF debug info to be produced .. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling Emit extra debug info to make sample profile more accurate .. option:: -fdebug-macro, -fno-debug-macro Emit macro debug information .. option:: -fdebug-pass-arguments .. option:: -fdebug-pass-structure .. option:: -fdebug-prefix-map=<arg> remap file source paths in debug info .. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address Use DWARF base address selection entries in .debug\_ranges .. option:: -fdebug-types-section, -fno-debug-types-section Place debug types in their own section (ELF Only) .. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing Parse templated function definitions at the end of the translation unit .. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks Treat usage of null pointers as undefined behavior (default) .. option:: -fdenormal-fp-math=<arg> .. option:: -fdiagnostics-absolute-paths Print absolute paths in diagnostics .. option:: -fdiagnostics-color, -fno-diagnostics-color .. program:: clang1 .. option:: -fdiagnostics-color=<arg> .. program:: clang .. option:: -fdiagnostics-hotness-threshold=<value> Prevent optimization remarks from being output if they do not have at least this profile count. Use 'auto' to apply the threshold from profile summary .. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness Enable profile hotness information in diagnostic line .. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack Display include stacks for diagnostic notes .. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option Print option name with mappable diagnostics .. option:: -fdiagnostics-show-template-tree Print a template comparison tree for differing templates .. option:: -fdigraphs, -fno-digraphs Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) .. option:: -fdirect-access-external-data, -fno-direct-access-external-data Don't use GOT indirection to reference external data symbols .. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers Allow '$' in identifiers .. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes Enable '\[\[\]\]' attributes in all C and C++ language modes .. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm .. option:: -fdwarf-exceptions Use DWARF style exceptions .. option:: -felide-constructors, -fno-elide-constructors .. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols .. option:: -feliminate-unused-debug-types, -fno-eliminate-unused-debug-types Do not emit debug info for defined but unused types .. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) Embed LLVM bitcode (option: off, all, bitcode, marker) .. option:: -femit-all-decls Emit all declarations, even if unused .. option:: -femulated-tls, -fno-emulated-tls Use emutls functions to access thread\_local variables .. option:: -fenable-matrix Enable matrix data type and related builtin functions .. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> .. option:: -ferror-limit=<arg> .. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls .. option:: -fexceptions, -fno-exceptions Enable support for exception handling .. option:: -fexec-charset=<arg> .. option:: -fexperimental-new-constant-interpreter Enable the experimental new constant interpreter .. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> .. option:: -fextend-arguments=<arg> Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions .. option:: -ffast-math, -fno-fast-math Allow aggressive, lossy floating-point optimizations .. option:: -ffile-compilation-dir=<arg> The compilation directory to embed in the debug info and coverage mapping. .. option:: -ffile-prefix-map=<arg> remap file source paths in debug info and predefined preprocessor macros .. option:: -ffinite-loops, -fno-finite-loops Assume all loops are finite. .. option:: -ffinite-math-only, -fno-finite-math-only .. option:: -ffixed-point, -fno-fixed-point Enable fixed point types .. option:: -ffor-scope, -fno-for-scope .. option:: -fforce-dwarf-frame, -fno-force-dwarf-frame Always emit a debug frame section .. option:: -fforce-emit-vtables, -fno-force-emit-vtables Emits more virtual tables to improve devirtualization .. option:: -fforce-enable-int128, -fno-force-enable-int128 Enable support for int128\_t type .. option:: -ffp-contract=<arg> Form fused FP ops (e.g. FMAs): fast (fuses across statements disregarding pragmas) \| on (only fuses in the same statement unless dictated by pragmas) \| off (never fuses) \| fast-honor-pragmas (fuses across statements unless diectated by pragmas). Default is 'fast' for CUDA, 'fast-honor-pragmas' for HIP, and 'on' otherwise. .. option:: -ffp-exception-behavior=<arg> Specifies the exception behavior of floating-point operations. .. option:: -ffp-model=<arg> Controls the semantics of floating-point calculations. .. option:: -ffreestanding Assert that the compilation takes place in a freestanding environment .. option:: -ffunction-sections, -fno-function-sections Place each function in its own section .. option:: -fgnu-inline-asm, -fno-gnu-inline-asm .. option:: -fgnu-keywords, -fno-gnu-keywords Allow GNU-extension keywords regardless of language standard .. option:: -fgnu-runtime Generate output compatible with the standard GNU Objective-C runtime .. option:: -fgnu89-inline, -fno-gnu89-inline Use the gnu89 inline semantics .. option:: -fgnuc-version=<arg> Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) .. option:: -fgpu-allow-device-init, -fno-gpu-allow-device-init Allow device side init function in HIP (experimental) .. option:: -fgpu-defer-diag, -fno-gpu-defer-diag Defer host/device related diagnostic messages for CUDA/HIP .. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc Generate relocatable device code, also known as separate compilation mode .. option:: -fgpu-sanitize, -fno-gpu-sanitize Enable sanitizer for AMDGPU target .. option:: -fhip-fp32-correctly-rounded-divide-sqrt, -fno-hip-fp32-correctly-rounded-divide-sqrt Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only) .. option:: -fhip-new-launch-api, -fno-hip-new-launch-api Use new kernel launching API for HIP .. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities .. option:: -fhonor-nans, -fno-honor-nans .. option:: -fhosted .. option:: -fignore-exceptions Enable support for ignoring exception handling constructs .. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps Implicitly search the file system for module map files. .. option:: -fimplicit-modules, -fno-implicit-modules .. option:: -finput-charset=<arg> Specify the default character set for source files .. option:: -finstrument-function-entry-bare Instrument function entry only, after inlining, without arguments to the instrumentation call .. option:: -finstrument-functions Generate calls to instrument function entry and exit .. option:: -finstrument-functions-after-inlining Like -finstrument-functions, but insert the calls after inlining .. option:: -fintegrated-as, -fno-integrated-as, -integrated-as Enable the integrated assembler .. option:: -fintegrated-cc1, -fno-integrated-cc1 Run cc1 in-process .. option:: -fjump-tables, -fno-jump-tables Use jump tables for lowering switches .. option:: -fkeep-static-consts, -fno-keep-static-consts Keep static const variables if unused .. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) Enable implicit vector bit-casts .. option:: -flimited-precision=<arg> .. option:: -flto, -fno-lto Enable LTO in 'full' mode .. option:: -flto-jobs=<arg> Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) .. program:: clang1 .. option:: -flto=<arg> .. program:: clang Set LTO mode to either 'full' or 'thin' .. program:: clang2 .. option:: -flto=auto .. program:: clang .. program:: clang3 .. option:: -flto=jobserver .. program:: clang .. option:: -fmacro-backtrace-limit=<arg> .. option:: -fmath-errno, -fno-math-errno Require math functions to indicate errors by setting errno .. option:: -fmax-tokens=<arg> Max total number of preprocessed tokens for -Wmax-tokens. .. option:: -fmax-type-align=<arg> Specify the maximum alignment to enforce on pointers lacking an explicit alignment .. option:: -fmemory-profile, -fno-memory-profile Enable heap memory profiling .. program:: clang1 .. option:: -fmemory-profile=<directory> .. program:: clang Enable heap memory profiling and dump results into <directory> .. option:: -fmerge-all-constants, -fno-merge-all-constants Allow merging of constants .. option:: -fmessage-length=<arg> Format message diagnostics so that they fit within N columns .. option:: -fmodule-file-deps, -fno-module-file-deps .. option:: -fmodule-map-file=<file> Load this module map file .. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg> Specify the name of the module to build .. option:: -fmodules, -fno-modules Enable the 'modules' language feature .. option:: -fmodules-decluse, -fno-modules-decluse Require declaration of modules used within a module .. option:: -fmodules-ignore-macro=<arg> Ignore the definition of the given macro when building and loading modules .. option:: -fmodules-search-all, -fno-modules-search-all Search even non-imported modules to resolve references .. option:: -fmodules-strict-decluse Like -fmodules-decluse but requires all headers to be in modules .. option:: -fmodules-ts Enable support for the C++ Modules TS .. option:: -fmodules-validate-input-files-content Validate PCM input files based on content if mtime differs .. option:: -fms-compatibility, -fno-ms-compatibility Enable full Microsoft Visual C++ compatibility .. option:: -fms-compatibility-version=<arg> Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) .. option:: -fms-extensions, -fno-ms-extensions Accept some non-standard constructs supported by the Microsoft compiler .. option:: -fms-memptr-rep=<arg> .. option:: -fms-volatile .. option:: -fmsc-version=<arg> Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) .. option:: -fmudflap .. option:: -fmudflapth .. option:: -fnested-functions .. option:: -fnew-alignment=<align>, -fnew-alignment <arg> Specifies the largest alignment guaranteed by '::operator new(size\_t)' .. option:: -fnext-runtime .. option:: -fno-builtin-<arg> Disable implicit builtin knowledge of a specific function .. option:: -fno-elide-type Do not elide types when printing diagnostics .. option:: -fno-max-type-align .. option:: -fno-strict-modules-decluse .. option:: -fno-temp-file Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes .. option:: -fno-working-directory .. option:: -fno\_modules-validate-input-files-content .. program:: clang1 .. option:: -fno\_pch-validate-input-files-content .. program:: clang .. option:: -fnoxray-link-deps .. option:: -fobjc-abi-version=<arg> .. option:: -fobjc-arc, -fno-objc-arc Synthesize retain and release calls for Objective-C pointers .. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions Use EH-safe code when synthesizing retains and releases in -fobjc-arc .. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls .. option:: -fobjc-disable-direct-methods-for-testing Ignore attribute objc\_direct so that direct methods can be tested .. option:: -fobjc-encode-cxx-class-template-spec, -fno-objc-encode-cxx-class-template-spec Fully encode c++ class template specialization .. option:: -fobjc-exceptions, -fno-objc-exceptions Enable Objective-C exceptions .. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type .. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch .. option:: -fobjc-link-runtime .. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi .. option:: -fobjc-nonfragile-abi-version=<arg> .. option:: -fobjc-runtime=<arg> Specify the target Objective-C runtime kind and version .. option:: -fobjc-sender-dependent-dispatch .. option:: -fobjc-weak, -fno-objc-weak Enable ARC-style weak references in Objective-C .. option:: -foffload-lto, -fno-offload-lto Enable LTO in 'full' mode for offload compilation .. program:: clang1 .. option:: -foffload-lto=<arg> .. program:: clang Set LTO mode to either 'full' or 'thin' for offload compilation .. option:: -fomit-frame-pointer, -fno-omit-frame-pointer .. option:: -fopenmp, -fno-openmp Parse OpenMP pragmas and generate parallel code. .. option:: -fopenmp-simd, -fno-openmp-simd Emit OpenMP code only for SIMD-based constructs. .. option:: -fopenmp-version=<arg> .. program:: clang1 .. option:: -fopenmp=<arg> .. program:: clang .. option:: -foperator-arrow-depth=<arg> .. option:: -foperator-names, -fno-operator-names .. option:: -foptimization-record-file=<file> Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options. .. option:: -foptimization-record-passes=<regex> Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) .. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls .. option:: -forder-file-instrumentation Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) .. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> .. option:: -fpack-struct, -fno-pack-struct .. program:: clang1 .. option:: -fpack-struct=<arg> .. program:: clang Specify the default maximum struct packing alignment .. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings Recognize and construct Pascal-style string literals .. option:: -fpass-plugin=<dsopath> Load pass plugin from a dynamic shared object file (only with new pass manager). .. option:: -fpatchable-function-entry=<N,M> Generate M NOPs before function entry and N-M NOPs after function entry .. option:: -fpcc-struct-return Override the default ABI to return all structs on the stack .. option:: -fpch-codegen, -fno-pch-codegen Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH .. option:: -fpch-debuginfo, -fno-pch-debuginfo Generate debug info for types in an object file built from this PCH and do not generate them elsewhere .. option:: -fpch-instantiate-templates, -fno-pch-instantiate-templates Instantiate templates already while building a PCH .. option:: -fpch-preprocess .. option:: -fpch-validate-input-files-content Validate PCH input files based on content if mtime differs .. option:: -fpic, -fno-pic .. option:: -fpie, -fno-pie .. option:: -fplt, -fno-plt .. option:: -fplugin=<dsopath> Load the named plugin (dynamic shared object) .. option:: -fprebuilt-implicit-modules, -fno-prebuilt-implicit-modules Look up implicit modules in the prebuilt module path .. option:: -fpreserve-as-comments, -fno-preserve-as-comments .. option:: -fproc-stat-report<arg> Print subprocess statistics .. program:: clang1 .. option:: -fproc-stat-report=<arg> .. program:: clang Save subprocess statistics to the given file .. option:: -fprofile-arcs, -fno-profile-arcs .. option:: -fprofile-dir=<arg> .. option:: -fprofile-exclude-files=<arg> Instrument only functions from files where names don't match all the regexes separated by a semi-colon .. option:: -fprofile-filter-files=<arg> Instrument only functions from files where names match any regex separated by a semi-colon .. option:: -fprofile-generate, -fno-profile-generate Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) .. program:: clang1 .. option:: -fprofile-generate=<directory> .. program:: clang Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) .. option:: -fprofile-instr-generate, -fno-profile-instr-generate Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) .. program:: clang1 .. option:: -fprofile-instr-generate=<file> .. program:: clang Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) .. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use .. program:: clang1 .. option:: -fprofile-instr-use=<arg> .. program:: clang Use instrumentation data for profile-guided optimization .. option:: -fprofile-list=<arg> Filename defining the list of functions/files to instrument .. option:: -fprofile-remapping-file=<file> Use the remappings described in <file> to match the profile data against names in the program .. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate Specifies that the sample profile is accurate. If the sample profile is accurate, callsites without profile samples are marked as cold. Otherwise, treat callsites without profile samples as if we have no profile .. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use .. program:: clang1 .. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> .. program:: clang Enable sample-based profile guided optimizations .. option:: -fprofile-update=<method> Set update method of profile counters (atomic,prefer-atomic,single) .. program:: clang1 .. option:: -fprofile-use=<pathname> .. program:: clang Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. .. option:: -fpseudo-probe-for-profiling, -fno-pseudo-probe-for-profiling Emit pseudo probes for sample profiling .. option:: -freciprocal-math, -fno-reciprocal-math Allow division operations to be reassociated .. option:: -freg-struct-return Override the default ABI to return small structs in registers .. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit Use atexit or \_\_cxa\_atexit to register global destructors .. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args Enable C++17 relaxed template template argument matching .. option:: -freroll-loops, -fno-reroll-loops Turn on loop reroller .. option:: -fretain-comments-from-system-headers .. option:: -frewrite-imports, -fno-rewrite-imports .. option:: -frewrite-includes, -fno-rewrite-includes .. option:: -frewrite-map-file=<arg> .. option:: -fropi, -fno-ropi Generate read-only position independent code (ARM only) .. option:: -frounding-math, -fno-rounding-math .. option:: -frtti, -fno-rtti .. option:: -frtti-data, -fno-rtti-data .. option:: -frwpi, -fno-rwpi Generate read-write position independent code (ARM only) .. option:: -fsave-optimization-record, -fno-save-optimization-record Generate a YAML optimization record file .. program:: clang1 .. option:: -fsave-optimization-record=<format> .. program:: clang Generate an optimization record file in a specific format .. option:: -fseh-exceptions Use SEH style exceptions .. option:: -fsemantic-interposition, -fno-semantic-interposition .. option:: -fshort-enums, -fno-short-enums Allocate to an enum type only as many bytes as it needs for the declared range of possible values .. option:: -fshort-wchar, -fno-short-wchar Force wchar\_t to be a short unsigned int .. option:: -fshow-column, -fno-show-column .. option:: -fshow-overloads=<arg> Which overload candidates to show when overload resolution fails: best\|all; defaults to all .. option:: -fshow-source-location, -fno-show-source-location .. option:: -fsignaling-math, -fno-signaling-math .. option:: -fsigned-bitfields .. option:: -fsigned-char, -fno-signed-char, --signed-char char is signed .. option:: -fsigned-zeros, -fno-signed-zeros .. option:: -fsized-deallocation, -fno-sized-deallocation Enable C++14 sized global deallocation functions .. option:: -fsjlj-exceptions Use SjLj style exceptions .. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize Enable the superword-level parallelism vectorization passes .. option:: -fspell-checking, -fno-spell-checking .. option:: -fspell-checking-limit=<arg> .. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF .. option:: -fsplit-lto-unit, -fno-split-lto-unit Enables splitting of the LTO unit .. option:: -fsplit-machine-functions, -fno-split-machine-functions Enable late function splitting using profile information (x86 ELF) .. option:: -fsplit-stack, -fno-split-stack Use segmented stack .. option:: -fstack-clash-protection, -fno-stack-clash-protection Enable stack clash protection .. option:: -fstack-protector, -fno-stack-protector Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable. .. option:: -fstack-protector-all Enable stack protectors for all functions .. option:: -fstack-protector-strong Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable .. option:: -fstack-size-section, -fno-stack-size-section Emit section containing metadata on function stack sizes .. option:: -fstack-usage Emit .su file containing information on function stack sizes .. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug Emit full debug info for all types used by the program .. option:: -fstrict-aliasing, -fno-strict-aliasing .. option:: -fstrict-enums, -fno-strict-enums Enable optimizations based on the strict definition of an enum's value range .. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow Assume that overflowing float-to-int casts are undefined (default) .. option:: -fstrict-overflow, -fno-strict-overflow .. option:: -fstrict-return, -fno-strict-return .. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers Enable optimizations based on the strict rules for overwriting polymorphic C++ objects .. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa .. option:: -fsymbol-partition=<arg> .. option:: -ftabstop=<arg> .. option:: -ftemplate-backtrace-limit=<arg> .. option:: -ftemplate-depth-<arg> .. option:: -ftemplate-depth=<arg> .. option:: -ftest-coverage, -fno-test-coverage .. option:: -fthin-link-bitcode=<arg> Write minimized bitcode to <file> for the ThinLTO thin link only .. option:: -fthinlto-index=<arg> Perform ThinLTO importing using provided function summary index .. option:: -fthreadsafe-statics, -fno-threadsafe-statics .. option:: -ftime-report .. program:: clang1 .. option:: -ftime-report=<arg> .. program:: clang (For new pass manager) "per-pass": one report for each pass; "per-pass-run": one report for each pass invocation .. option:: -ftime-trace Turn on time profiler. Generates JSON file based on output filename. Results can be analyzed with chrome://tracing or `Speedscope App <https://www.speedscope.app>`_ for flamegraph visualization. .. option:: -ftime-trace-granularity=<arg> Minimum time granularity (in microseconds) traced by time profiler .. option:: -ftls-model=<arg> .. option:: -ftrap-function=<arg> Issue call to specified function rather than a trap instruction .. option:: -ftrapping-math, -fno-trapping-math .. option:: -ftrapv Trap on integer overflow .. option:: -ftrapv-handler <arg> .. program:: clang1 .. option:: -ftrapv-handler=<function name> .. program:: clang Specify the function to be called on overflow .. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs Process trigraph sequences .. option:: -ftrivial-auto-var-init-stop-after=<arg> Stop initializing trivial automatic stack variables after the specified number of instances .. option:: -ftrivial-auto-var-init=<arg> Initialize trivial automatic stack variables: uninitialized (default) \| pattern .. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names Use unique names for basic block sections (ELF Only) .. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path .. option:: -funique-section-names, -fno-unique-section-names .. option:: -funit-at-a-time, -fno-unit-at-a-time .. option:: -funroll-loops, -fno-unroll-loops Turn on loop unroller .. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations .. option:: -funsigned-bitfields .. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char .. option:: -funwind-tables, -fno-unwind-tables .. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit .. option:: -fuse-init-array, -fno-use-init-array .. option:: -fuse-ld=<arg> .. option:: -fuse-line-directives, -fno-use-line-directives Use #line in preprocessed output .. option:: -fvalidate-ast-input-files-content Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical .. option:: -fveclib=<arg> Use the given vector functions library .. option:: -fvectorize, -fno-vectorize, -ftree-vectorize Enable the loop vectorization passes .. option:: -fverbose-asm, -dA, -fno-verbose-asm Generate verbose assembly output .. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination Enables dead virtual function elimination optimization. Requires -flto=full .. option:: -fvisibility-dllexport=<arg> The visibility for dllexport defintions \[-fvisibility-from-dllstorageclass\] .. option:: -fvisibility-externs-dllimport=<arg> The visibility for dllimport external declarations \[-fvisibility-from-dllstorageclass\] .. option:: -fvisibility-externs-nodllstorageclass=<arg> The visibility for external declarations without an explicit DLL dllstorageclass \[-fvisibility-from-dllstorageclass\] .. option:: -fvisibility-from-dllstorageclass, -fno-visibility-from-dllstorageclass Set the visiblity of symbols in the generated code from their DLL storage class .. option:: -fvisibility-global-new-delete-hidden Give global C++ operator new and delete declarations hidden visibility .. option:: -fvisibility-inlines-hidden, -fno-visibility-inlines-hidden Give inline C++ member functions hidden visibility by default .. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default .. option:: -fvisibility-ms-compat Give global types 'default' visibility and global functions and variables 'hidden' visibility by default .. option:: -fvisibility-nodllstorageclass=<arg> The visibility for defintiions without an explicit DLL export class \[-fvisibility-from-dllstorageclass\] .. option:: -fvisibility=<arg> Set the default symbol visibility for all global declarations .. option:: -fwarn-stack-size=<arg> .. option:: -fwasm-exceptions Use WebAssembly style exceptions .. option:: -fwhole-program-vtables, -fno-whole-program-vtables Enables whole-program vtable optimization. Requires -flto .. option:: -fwrapv, -fno-wrapv Treat signed integer overflow as two's complement .. option:: -fwritable-strings Store string literals as writable data .. option:: -fxl-pragma-pack, -fno-xl-pragma-pack Enable IBM XL #pragma pack handling .. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented .. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented .. option:: -fxray-always-instrument=<arg> DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. .. option:: -fxray-attr-list=<arg> Filename defining the list of functions/types for imbuing XRay attributes. .. option:: -fxray-function-groups=<arg> Only instrument 1 of N groups .. option:: -fxray-function-index, -fno-xray-function-index .. option:: -fxray-ignore-loops, -fno-xray-ignore-loops Don't instrument functions with loops unless they also meet the minimum function size .. option:: -fxray-instruction-threshold<arg> .. program:: clang1 .. option:: -fxray-instruction-threshold=<arg> .. program:: clang Sets the minimum function size to instrument with XRay .. option:: -fxray-instrument, -fno-xray-instrument Generate XRay instrumentation sleds on function entry and exit .. option:: -fxray-instrumentation-bundle=<arg> Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'. 'function' includes both 'function-entry' and 'function-exit'. .. option:: -fxray-link-deps Tells clang to add the link dependencies for XRay. .. option:: -fxray-modes=<arg> List of modes to link in by default into XRay instrumented binaries. .. option:: -fxray-never-instrument=<arg> DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. .. option:: -fxray-selected-function-group=<arg> When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 .. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss .. option:: -fzvector, -fno-zvector, -mzvector Enable System z vector language extension .. option:: --gpu-bundle-output, --no-gpu-bundle-output Bundle output files of HIP device compilation .. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic Warn on language extensions .. option:: -pedantic-errors, --pedantic-errors OpenCL flags ------------ .. option:: -cl-denorms-are-zero OpenCL only. Allow denormals to be flushed to zero. .. option:: -cl-fast-relaxed-math OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. .. option:: -cl-finite-math-only OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. .. option:: -cl-fp32-correctly-rounded-divide-sqrt OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. .. option:: -cl-kernel-arg-info OpenCL only. Generate kernel argument metadata. .. option:: -cl-mad-enable OpenCL only. Allow use of less precise MAD computations in the generated binary. .. option:: -cl-no-signed-zeros OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. .. option:: -cl-no-stdinc OpenCL only. Disables all standard includes containing non-native compiler types and functions. .. option:: -cl-opt-disable OpenCL only. This option disables all optimizations. By default optimizations are enabled. .. option:: -cl-single-precision-constant OpenCL only. Treat double precision floating-point constant as single precision constant. .. option:: -cl-std=<arg> OpenCL language standard to compile for. .. option:: -cl-strict-aliasing OpenCL only. This option is added for compatibility with OpenCL 1.0. .. option:: -cl-uniform-work-group-size OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel .. option:: -cl-unsafe-math-optimizations OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. SYCL flags ---------- .. option:: -fsycl, -fno-sycl Enables SYCL kernels compilation for device .. option:: -sycl-std=<arg> SYCL language standard to compile for. Target-dependent compilation options ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> Put objects of at most <size> bytes into small data section (MIPS / Hexagon) .. option:: -ffixed-x1 Reserve the x1 register (AArch64/RISC-V only) .. option:: -ffixed-x10 Reserve the x10 register (AArch64/RISC-V only) .. option:: -ffixed-x11 Reserve the x11 register (AArch64/RISC-V only) .. option:: -ffixed-x12 Reserve the x12 register (AArch64/RISC-V only) .. option:: -ffixed-x13 Reserve the x13 register (AArch64/RISC-V only) .. option:: -ffixed-x14 Reserve the x14 register (AArch64/RISC-V only) .. option:: -ffixed-x15 Reserve the x15 register (AArch64/RISC-V only) .. option:: -ffixed-x16 Reserve the x16 register (AArch64/RISC-V only) .. option:: -ffixed-x17 Reserve the x17 register (AArch64/RISC-V only) .. option:: -ffixed-x18 Reserve the x18 register (AArch64/RISC-V only) .. option:: -ffixed-x19 Reserve the x19 register (AArch64/RISC-V only) .. option:: -ffixed-x2 Reserve the x2 register (AArch64/RISC-V only) .. option:: -ffixed-x20 Reserve the x20 register (AArch64/RISC-V only) .. option:: -ffixed-x21 Reserve the x21 register (AArch64/RISC-V only) .. option:: -ffixed-x22 Reserve the x22 register (AArch64/RISC-V only) .. option:: -ffixed-x23 Reserve the x23 register (AArch64/RISC-V only) .. option:: -ffixed-x24 Reserve the x24 register (AArch64/RISC-V only) .. option:: -ffixed-x25 Reserve the x25 register (AArch64/RISC-V only) .. option:: -ffixed-x26 Reserve the x26 register (AArch64/RISC-V only) .. option:: -ffixed-x27 Reserve the x27 register (AArch64/RISC-V only) .. option:: -ffixed-x28 Reserve the x28 register (AArch64/RISC-V only) .. option:: -ffixed-x29 Reserve the x29 register (AArch64/RISC-V only) .. option:: -ffixed-x3 Reserve the x3 register (AArch64/RISC-V only) .. option:: -ffixed-x30 Reserve the x30 register (AArch64/RISC-V only) .. option:: -ffixed-x31 Reserve the x31 register (AArch64/RISC-V only) .. option:: -ffixed-x4 Reserve the x4 register (AArch64/RISC-V only) .. option:: -ffixed-x5 Reserve the x5 register (AArch64/RISC-V only) .. option:: -ffixed-x6 Reserve the x6 register (AArch64/RISC-V only) .. option:: -ffixed-x7 Reserve the x7 register (AArch64/RISC-V only) .. option:: -ffixed-x8 Reserve the x8 register (AArch64/RISC-V only) .. option:: -ffixed-x9 Reserve the x9 register (AArch64/RISC-V only) .. option:: -m16 .. option:: -m32 .. option:: -m64 .. option:: -mabi=<arg> .. program:: clang1 .. option:: -mabi=vec-default .. program:: clang Enable the default Altivec ABI on AIX (AIX only). Uses only volatile vector registers. .. program:: clang2 .. option:: -mabi=vec-extabi .. program:: clang Enable the extended Altivec ABI on AIX (AIX only). Uses volatile and nonvolatile vector registers .. option:: -maix-struct-return Return all structs in memory (PPC32 only) .. option:: -malign-branch-boundary=<arg> Specify the boundary's size to align branches .. option:: -malign-branch=<arg1>,<arg2>... Specify types of branches to align .. option:: -malign-double Align doubles to two words in structs (x86 only) .. option:: -mamdgpu-ieee, -mno-amdgpu-ieee Sets the IEEE bit in the expected default floating point mode register. Floating point opcodes that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008. This option changes the ABI. (AMDGPU only) .. option:: -march=<arg> .. option:: -masm=<arg> .. option:: -mbackchain, -mno-backchain Link stack frames through backchain on System Z .. option:: -mbranches-within-32B-boundaries Align selected branches (fused, jcc, jmp) within 32-byte boundary .. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) .. option:: -mcode-object-v3, -mno-code-object-v3 Legacy option to specify code object ABI V3 (AMDGPU only) .. option:: -mcode-object-version=<version> Specify code object ABI version. Defaults to 3. (AMDGPU only) .. option:: -mconsole<arg> .. program:: clang1 .. option:: -mcpu=<arg>, -mv5 (equivalent to -mcpu=hexagonv5), -mv55 (equivalent to -mcpu=hexagonv55), -mv60 (equivalent to -mcpu=hexagonv60), -mv62 (equivalent to -mcpu=hexagonv62), -mv65 (equivalent to -mcpu=hexagonv65), -mv66 (equivalent to -mcpu=hexagonv66), -mv67 (equivalent to -mcpu=hexagonv67), -mv67t (equivalent to -mcpu=hexagonv67t), -mv68 (equivalent to -mcpu=hexagonv68) .. program:: clang .. option:: -mcrc, -mno-crc Allow use of CRC instructions (ARM/Mips only) .. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> .. option:: -mdll<arg> .. option:: -mdouble=<arg> Force double to be 32 bits or 64 bits .. option:: -mdynamic-no-pic<arg> .. option:: -meabi <arg> Set EABI type, e.g. 4, 5 or gnu (default depends on triple) .. option:: -menable-experimental-extensions Enable use of experimental RISC-V extensions. .. option:: -mfentry Insert calls to fentry at function entry (x86/SystemZ only) .. option:: -mfloat-abi=<arg> .. option:: -mfpmath=<arg> .. option:: -mfpu=<arg> .. option:: -mglobal-merge, -mno-global-merge Enable merging of globals .. option:: -mhard-float .. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> .. option:: -mhwmult=<arg> .. option:: -miamcu, -mno-iamcu Use Intel MCU ABI .. option:: -mignore-xcoff-visibility Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file .. option:: -mimplicit-float, -mno-implicit-float .. option:: -mimplicit-it=<arg> .. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible (integrated-as) Emit an object file which can be used with an incremental linker .. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> .. option:: -mkernel .. option:: -mlong-calls, -mno-long-calls Generate branches with extended addressability, usually via indirect jumps. .. option:: -mlvi-cfi, -mno-lvi-cfi Enable only control-flow mitigations for Load Value Injection (LVI) .. option:: -mlvi-hardening, -mno-lvi-hardening Enable all mitigations for Load Value Injection (LVI) .. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> Set Mac OS X deployment target .. option:: -mmcu=<arg> .. option:: -mms-bitfields, -mno-ms-bitfields Set the default structure layout to be compatible with the Microsoft compiler standard .. option:: -mnop-mcount Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. .. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer Omit frame pointer setup for leaf functions .. option:: -moslib=<arg> .. option:: -mpacked-stack, -mno-packed-stack Use packed stack layout (SystemZ only). .. option:: -mpad-max-prefix-size=<arg> Specify maximum number of prefixes to use for padding .. option:: -mprefer-vector-width=<arg> Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. .. option:: -mqdsp6-compat Enable hexagon-qdsp6 backward compatibility .. option:: -mrecip .. program:: clang1 .. option:: -mrecip=<arg1>,<arg2>... .. program:: clang .. option:: -mrecord-mcount Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. .. option:: -mred-zone, -mno-red-zone .. option:: -mregparm=<arg> .. option:: -mrelax, -mno-relax Enable linker relaxation .. option:: -mrelax-all, -mno-relax-all (integrated-as) Relax all machine instructions .. option:: -mretpoline, -mno-retpoline .. option:: -mrtd, -mno-rtd Make StdCall calling convention the default .. option:: -mseses, -mno-seses Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations .. option:: -msign-return-address=<arg> Select return address signing scope .. option:: -msim .. option:: -msoft-float, -mno-soft-float Use software floating point .. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening .. option:: -mstack-alignment=<arg> Set the stack alignment .. option:: -mstack-arg-probe, -mno-stack-arg-probe Enable stack probes .. option:: -mstack-probe-size=<arg> Set the stack probe size .. option:: -mstack-protector-guard-offset=<arg> Use the given offset for addressing the stack-protector guard .. option:: -mstack-protector-guard-reg=<arg> Use the given reg for addressing the stack-protector guard .. option:: -mstack-protector-guard=<arg> Use the given guard (global, tls) for addressing the stack-protector guard .. option:: -mstackrealign, -mno-stackrealign Force realign the stack at entry to every function .. option:: -msvr4-struct-return Return small structs in registers (PPC32 only) .. option:: -mthread-model <arg> The thread model to use, e.g. posix, single (posix by default) .. option:: -mthreads<arg> .. option:: -mthumb, -mno-thumb .. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs Enable direct TLS access through segment registers (default) .. option:: -mtls-size=<arg> Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) \| 24 (for 16MB, default) \| 32 (for 4GB) \| 48 (for 256TB, needs -mcmodel=large) .. program:: clang1 .. option:: -mtune=<arg> .. program:: clang Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. .. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> .. option:: -municode<arg> .. option:: -munsafe-fp-atomics, -mno-unsafe-fp-atomics Enable unsafe floating point atomic instructions (AMDGPU only) .. option:: -mvx, -mno-vx .. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings .. option:: -mwatchos-version-min=<arg> .. option:: -mwavefrontsize64, -mno-wavefrontsize64 Specify wavefront size 64 mode (AMDGPU only) .. option:: -mwindows<arg> .. option:: -mx32 AARCH64 ------- .. option:: -fcall-saved-x10 Make the x10 register call-saved (AArch64 only) .. option:: -fcall-saved-x11 Make the x11 register call-saved (AArch64 only) .. option:: -fcall-saved-x12 Make the x12 register call-saved (AArch64 only) .. option:: -fcall-saved-x13 Make the x13 register call-saved (AArch64 only) .. option:: -fcall-saved-x14 Make the x14 register call-saved (AArch64 only) .. option:: -fcall-saved-x15 Make the x15 register call-saved (AArch64 only) .. option:: -fcall-saved-x18 Make the x18 register call-saved (AArch64 only) .. option:: -fcall-saved-x8 Make the x8 register call-saved (AArch64 only) .. option:: -fcall-saved-x9 Make the x9 register call-saved (AArch64 only) .. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 Workaround Cortex-A53 erratum 835769 (AArch64 only) .. option:: -mgeneral-regs-only Generate code which only uses the general purpose registers (AArch64 only) .. option:: -mmark-bti-property Add .note.gnu.property with BTI to assembly files (AArch64 only) .. option:: -msve-vector-bits=<arg> Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) AMDGPU ------ .. option:: -mcumode, -mno-cumode Specify CU wavefront execution mode (AMDGPU only) .. option:: -mtgsplit, -mno-tgsplit Enable threadgroup split execution mode (AMDGPU only) ARM --- .. option:: -faapcs-bitfield-load Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). .. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). .. option:: -ffixed-r9 Reserve the r9 register (ARM only) .. option:: -mcmse Allow use of CMSE (Armv8-M Security Extensions) .. option:: -mexecute-only, -mno-execute-only, -mpure-code Disallow generation of data access to code sections (ARM only) .. option:: -mno-movt Disallow use of movt/movw pairs (ARM only) .. option:: -mno-neg-immediates Disallow converting instructions with negative immediates to their negation or inversion. .. option:: -mnocrc Disallow use of CRC instructions (ARM only) .. option:: -mrestrict-it, -mno-restrict-it Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. .. option:: -mtp=<arg> Thread pointer access method (AArch32/AArch64 only) .. option:: -munaligned-access, -mno-unaligned-access Allow memory accesses to be unaligned (AArch32/AArch64 only) Hexagon ------- .. option:: -mieee-rnd-near .. option:: -mmemops, -mno-memops Enable generation of memop instructions .. option:: -mnvj, -mno-nvj Enable generation of new-value jumps .. option:: -mnvs, -mno-nvs Enable generation of new-value stores .. option:: -mpackets, -mno-packets Enable generation of instruction packets Hexagon ------- .. option:: -mhvx, -mno-hvx Enable Hexagon Vector eXtensions .. option:: -mhvx-length=<arg> Set Hexagon Vector Length .. program:: clang1 .. option:: -mhvx=<arg> .. program:: clang Enable Hexagon Vector eXtensions M68k ---- .. option:: -ffixed-a0 Reserve the a0 register (M68k only) .. option:: -ffixed-a1 Reserve the a1 register (M68k only) .. option:: -ffixed-a2 Reserve the a2 register (M68k only) .. option:: -ffixed-a3 Reserve the a3 register (M68k only) .. option:: -ffixed-a4 Reserve the a4 register (M68k only) .. option:: -ffixed-a5 Reserve the a5 register (M68k only) .. option:: -ffixed-a6 Reserve the a6 register (M68k only) .. option:: -ffixed-d0 Reserve the d0 register (M68k only) .. option:: -ffixed-d1 Reserve the d1 register (M68k only) .. option:: -ffixed-d2 Reserve the d2 register (M68k only) .. option:: -ffixed-d3 Reserve the d3 register (M68k only) .. option:: -ffixed-d4 Reserve the d4 register (M68k only) .. option:: -ffixed-d5 Reserve the d5 register (M68k only) .. option:: -ffixed-d6 Reserve the d6 register (M68k only) .. option:: -ffixed-d7 Reserve the d7 register (M68k only) .. option:: -m68000 .. option:: -m68010 .. option:: -m68020 .. option:: -m68030 .. option:: -m68040 .. option:: -m68060 MIPS ---- .. option:: -mabicalls, -mno-abicalls Enable SVR4-style position-independent code (Mips only) .. option:: -mabs=<arg> .. option:: -mcheck-zero-division, -mno-check-zero-division .. option:: -mcompact-branches=<arg> .. option:: -mdouble-float .. option:: -mdsp, -mno-dsp .. option:: -mdspr2, -mno-dspr2 .. option:: -membedded-data, -mno-embedded-data Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) .. option:: -mextern-sdata, -mno-extern-sdata Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) .. option:: -mfp32 Use 32-bit floating point registers (MIPS only) .. option:: -mfp64 Use 64-bit floating point registers (MIPS only) .. option:: -mginv, -mno-ginv .. option:: -mgpopt, -mno-gpopt Use GP relative accesses for symbols known to be in a small data section (MIPS) .. option:: -mindirect-jump=<arg> Change indirect jump instructions to inhibit speculation .. option:: -mips16 .. option:: -mldc1-sdc1, -mno-ldc1-sdc1 .. option:: -mlocal-sdata, -mno-local-sdata Extend the -G behaviour to object local data (MIPS) .. option:: -mmadd4, -mno-madd4 Enable the generation of 4-operand madd.s, madd.d and related instructions. .. option:: -mmicromips, -mno-micromips .. option:: -mmsa, -mno-msa Enable MSA ASE (MIPS only) .. option:: -mmt, -mno-mt Enable MT ASE (MIPS only) .. option:: -mnan=<arg> .. option:: -mno-mips16 .. option:: -msingle-float .. option:: -mvirt, -mno-virt .. option:: -mxgot, -mno-xgot PowerPC ------- .. option:: -maltivec, -mno-altivec .. option:: -mcmpb, -mno-cmpb .. option:: -mcrbits, -mno-crbits .. option:: -mcrypto, -mno-crypto .. option:: -mdirect-move, -mno-direct-move .. option:: -mefpu2 .. option:: -mfloat128, -mno-float128 .. option:: -mfprnd, -mno-fprnd .. option:: -mhtm, -mno-htm .. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors .. option:: -misel, -mno-isel .. option:: -mlongcall, -mno-longcall .. option:: -mmfocrf, -mmfcrf, -mno-mfocrf .. option:: -mmma, -mno-mma .. option:: -mpaired-vector-memops, -mno-paired-vector-memops .. option:: -mpcrel, -mno-pcrel .. option:: -mpopcntd, -mno-popcntd .. option:: -mpower10-vector, -mno-power10-vector .. option:: -mpower8-vector, -mno-power8-vector .. option:: -mpower9-vector, -mno-power9-vector .. option:: -mprefixed, -mno-prefixed .. option:: -mprivileged .. option:: -mrop-protect .. option:: -msecure-plt .. option:: -mspe, -mno-spe .. option:: -mvsx, -mno-vsx WebAssembly ----------- .. option:: -matomics, -mno-atomics .. option:: -mbulk-memory, -mno-bulk-memory .. option:: -mexception-handling, -mno-exception-handling .. option:: -mmultivalue, -mno-multivalue .. option:: -mmutable-globals, -mno-mutable-globals .. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint .. option:: -mreference-types, -mno-reference-types .. option:: -msign-ext, -mno-sign-ext .. option:: -msimd128, -mno-simd128 .. option:: -mtail-call, -mno-tail-call WebAssembly Driver ------------------ .. option:: -mexec-model=<arg> Execution model (WebAssembly only) X86 --- .. option:: -m3dnow, -mno-3dnow .. option:: -m3dnowa, -mno-3dnowa .. option:: -madx, -mno-adx .. option:: -maes, -mno-aes .. option:: -mamx-bf16, -mno-amx-bf16 .. option:: -mamx-int8, -mno-amx-int8 .. option:: -mamx-tile, -mno-amx-tile .. option:: -mavx, -mno-avx .. option:: -mavx2, -mno-avx2 .. option:: -mavx512bf16, -mno-avx512bf16 .. option:: -mavx512bitalg, -mno-avx512bitalg .. option:: -mavx512bw, -mno-avx512bw .. option:: -mavx512cd, -mno-avx512cd .. option:: -mavx512dq, -mno-avx512dq .. option:: -mavx512er, -mno-avx512er .. option:: -mavx512f, -mno-avx512f .. option:: -mavx512ifma, -mno-avx512ifma .. option:: -mavx512pf, -mno-avx512pf .. option:: -mavx512vbmi, -mno-avx512vbmi .. option:: -mavx512vbmi2, -mno-avx512vbmi2 .. option:: -mavx512vl, -mno-avx512vl .. option:: -mavx512vnni, -mno-avx512vnni .. option:: -mavx512vp2intersect, -mno-avx512vp2intersect .. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq .. option:: -mavxvnni, -mno-avxvnni .. option:: -mbmi, -mno-bmi .. option:: -mbmi2, -mno-bmi2 .. option:: -mcldemote, -mno-cldemote .. option:: -mclflushopt, -mno-clflushopt .. option:: -mclwb, -mno-clwb .. option:: -mclzero, -mno-clzero .. option:: -mcx16, -mno-cx16 .. option:: -menqcmd, -mno-enqcmd .. option:: -mf16c, -mno-f16c .. option:: -mfma, -mno-fma .. option:: -mfma4, -mno-fma4 .. option:: -mfsgsbase, -mno-fsgsbase .. option:: -mfxsr, -mno-fxsr .. option:: -mgfni, -mno-gfni .. option:: -mhreset, -mno-hreset .. option:: -minvpcid, -mno-invpcid .. option:: -mkl, -mno-kl .. option:: -mlwp, -mno-lwp .. option:: -mlzcnt, -mno-lzcnt .. option:: -mmmx, -mno-mmx .. option:: -mmovbe, -mno-movbe .. option:: -mmovdir64b, -mno-movdir64b .. option:: -mmovdiri, -mno-movdiri .. option:: -mmwaitx, -mno-mwaitx .. option:: -mpclmul, -mno-pclmul .. option:: -mpconfig, -mno-pconfig .. option:: -mpku, -mno-pku .. option:: -mpopcnt, -mno-popcnt .. option:: -mprefetchwt1, -mno-prefetchwt1 .. option:: -mprfchw, -mno-prfchw .. option:: -mptwrite, -mno-ptwrite .. option:: -mrdpid, -mno-rdpid .. option:: -mrdrnd, -mno-rdrnd .. option:: -mrdseed, -mno-rdseed .. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk .. option:: -mrtm, -mno-rtm .. option:: -msahf, -mno-sahf .. option:: -mserialize, -mno-serialize .. option:: -msgx, -mno-sgx .. option:: -msha, -mno-sha .. option:: -mshstk, -mno-shstk .. option:: -msse, -mno-sse .. option:: -msse2, -mno-sse2 .. option:: -msse3, -mno-sse3 .. option:: -msse4.1, -mno-sse4.1 .. program:: clang1 .. option:: -msse4.2, -mno-sse4.2, -msse4 .. program:: clang .. option:: -msse4a, -mno-sse4a .. option:: -mssse3, -mno-ssse3 .. option:: -mtbm, -mno-tbm .. option:: -mtsxldtrk, -mno-tsxldtrk .. option:: -muintr, -mno-uintr .. option:: -mvaes, -mno-vaes .. option:: -mvpclmulqdq, -mno-vpclmulqdq .. option:: -mvzeroupper, -mno-vzeroupper .. option:: -mwaitpkg, -mno-waitpkg .. option:: -mwbnoinvd, -mno-wbnoinvd .. option:: -mwidekl, -mno-widekl .. option:: -mx87, -m80387, -mno-x87 .. option:: -mxop, -mno-xop .. option:: -mxsave, -mno-xsave .. option:: -mxsavec, -mno-xsavec .. option:: -mxsaveopt, -mno-xsaveopt .. option:: -mxsaves, -mno-xsaves RISCV ----- .. option:: -msave-restore, -mno-save-restore Enable using library calls for save and restore Long double flags ----------------- Selects the long double implementation .. option:: -mlong-double-128 Force long double to be 128 bits .. option:: -mlong-double-64 Force long double to be 64 bits .. option:: -mlong-double-80 Force long double to be 80 bits, padded to 128 bits for storage Optimization level ~~~~~~~~~~~~~~~~~~ Flags controlling how much optimization should be performed. .. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> .. option:: -Ofast<arg> Debug information generation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Flags controlling how much and what kind of debug information should be generated. Kind and level of debug information ----------------------------------- .. option:: -g, --debug, --debug=<arg> Generate source-level debug information .. option:: -gdwarf Generate source-level debug information with the default dwarf version .. option:: -gdwarf-2 Generate source-level debug information with dwarf version 2 .. option:: -gdwarf-3 Generate source-level debug information with dwarf version 3 .. option:: -gdwarf-4 Generate source-level debug information with dwarf version 4 .. option:: -gdwarf-5 Generate source-level debug information with dwarf version 5 .. option:: -gdwarf32 Enables DWARF32 format for ELF binaries, if debug information emission is enabled. .. option:: -gdwarf64 Enables DWARF64 format for ELF binaries, if debug information emission is enabled. .. option:: -gfull .. option:: -ginline-line-tables, -gno-inline-line-tables .. option:: -gused Debug level ___________ .. option:: -g0 .. option:: -g2 .. option:: -g3 .. option:: -ggdb0 .. option:: -ggdb1 .. option:: -ggdb2 .. option:: -ggdb3 .. option:: -gline-directives-only Emit debug line info directives only .. option:: -gline-tables-only, -g1, -gmlt Emit debug line number tables only .. option:: -gmodules Generate debug info with external references to clang modules or precompiled headers Debugger to tune debug information for ______________________________________ .. option:: -gdbx .. option:: -ggdb .. option:: -glldb .. option:: -gsce Debug information flags ----------------------- .. option:: -gcolumn-info, -gno-column-info .. option:: -gdwarf-aranges .. option:: -gembed-source, -gno-embed-source Embed source text in DWARF debug sections .. option:: -ggnu-pubnames, -gno-gnu-pubnames .. option:: -gpubnames, -gno-pubnames .. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches .. option:: -gsplit-dwarf, -gno-split-dwarf .. program:: clang1 .. option:: -gsplit-dwarf=<arg> .. program:: clang Set DWARF fission mode to either 'split' or 'single' .. option:: -gstrict-dwarf, -gno-strict-dwarf .. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) DWARF debug sections compression type Static analyzer flags ===================== Flags controlling the behavior of the Clang Static Analyzer. .. option:: -Xanalyzer <arg> Pass <arg> to the static analyzer Fortran compilation flags ========================= Flags that will be passed onto the ``gfortran`` compiler when Clang is given a Fortran input. .. option:: -A<arg>, --assert <arg>, --assert=<arg> .. option:: -A-<arg> .. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination .. option:: -falign-commons, -fno-align-commons .. option:: -fall-intrinsics, -fno-all-intrinsics .. option:: -fautomatic, -fno-automatic .. option:: -fbacktrace, -fno-backtrace .. option:: -fblas-matmul-limit=<arg> .. option:: -fbounds-check, -fno-bounds-check .. option:: -fcheck-array-temporaries, -fno-check-array-temporaries .. option:: -fcheck=<arg> .. option:: -fcoarray=<arg> .. option:: -fconvert=<arg> .. option:: -fcray-pointer, -fno-cray-pointer .. option:: -fd-lines-as-code, -fno-d-lines-as-code .. option:: -fd-lines-as-comments, -fno-d-lines-as-comments .. option:: -fdollar-ok, -fno-dollar-ok .. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized .. option:: -fdump-fortran-original, -fno-dump-fortran-original .. option:: -fdump-parse-tree, -fno-dump-parse-tree .. option:: -fexternal-blas, -fno-external-blas .. option:: -ff2c, -fno-f2c .. option:: -ffpe-trap=<arg> .. option:: -ffree-line-length-<arg> .. option:: -ffrontend-optimize, -fno-frontend-optimize .. option:: -finit-character=<arg> .. option:: -finit-integer=<arg> .. option:: -finit-local-zero, -fno-init-local-zero .. option:: -finit-logical=<arg> .. option:: -finit-real=<arg> .. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 .. option:: -fmax-array-constructor=<arg> .. option:: -fmax-errors=<arg> .. option:: -fmax-identifier-length, -fno-max-identifier-length .. option:: -fmax-stack-var-size=<arg> .. option:: -fmax-subrecord-length=<arg> .. option:: -fmodule-private, -fno-module-private .. option:: -fpack-derived, -fno-pack-derived .. option:: -fprotect-parens, -fno-protect-parens .. option:: -frange-check, -fno-range-check .. option:: -freal-4-real-10, -fno-real-4-real-10 .. option:: -freal-4-real-16, -fno-real-4-real-16 .. option:: -freal-4-real-8, -fno-real-4-real-8 .. option:: -freal-8-real-10, -fno-real-8-real-10 .. option:: -freal-8-real-16, -fno-real-8-real-16 .. option:: -freal-8-real-4, -fno-real-8-real-4 .. option:: -frealloc-lhs, -fno-realloc-lhs .. option:: -frecord-marker=<arg> .. option:: -frecursive, -fno-recursive .. option:: -frepack-arrays, -fno-repack-arrays .. option:: -fsecond-underscore, -fno-second-underscore .. option:: -fsign-zero, -fno-sign-zero .. option:: -fstack-arrays, -fno-stack-arrays .. option:: -funderscoring, -fno-underscoring .. option:: -fwhole-file, -fno-whole-file .. option:: -imultilib <arg> .. option:: -static-libgfortran Linker flags ============ Flags that are passed on to the linker .. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> Add directory to library search path .. option:: -Mach .. option:: -T<script> Specify <script> as linker script .. option:: -Tbss<addr> Set starting address of BSS to <addr> .. option:: -Tdata<addr> Set starting address of DATA to <addr> .. option:: -Ttext<addr> Set starting address of TEXT to <addr> .. option:: -Wl,<arg>,<arg2>... Pass the comma separated arguments in <arg> to the linker .. option:: -X .. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> Pass <arg> to the linker .. program:: clang1 .. option:: -Z .. program:: clang .. option:: -coverage, --coverage .. option:: -e<arg>, --entry .. option:: -filelist <arg> .. option:: --hip-device-lib=<arg> HIP device library .. option:: -l<arg> .. option:: --ld-path=<arg> .. option:: -nostartfiles .. program:: clang1 .. option:: -nostdlib, --no-standard-libraries .. program:: clang .. option:: -pie .. option:: -r .. option:: -rdynamic .. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> ROCm device library path. Alternative to rocm-path. .. option:: -rpath <arg> .. option:: -s .. option:: -shared, --shared .. option:: -specs=<arg>, --specs=<arg> .. option:: -static, --static .. option:: -static-pie .. option:: -t .. option:: -u<arg>, --force-link <arg>, --force-link=<arg> .. option:: -undef undef all system defines .. option:: -undefined<arg>, --no-undefined .. option:: -z <arg> Pass -z <arg> to the linker
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