This page lists the command line arguments currently supported by the
GCC-compatible clang and clang++ drivers.
.. program:: clang
.. option:: -B<dir>, --prefix <arg>, --prefix=<arg>
Add <dir> to search path for binaries and object files used implicitly
.. 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:: -Qunused-arguments
Don't emit warning for unused driver arguments
.. option:: -Wa,<arg>,<arg2>...
Pass the comma separated arguments in <arg> to the assembler
.. option:: -Wlarge-by-value-copy=<arg>
.. option:: -Xarch\_<arg1> <arg2>
.. option:: -Xcuda-fatbinary <arg>
Pass <arg> to fatbinary invocation
.. option:: -Xcuda-ptxas <arg>
Pass <arg> to the ptxas assembler
.. option:: -Z<arg>
.. option:: -a<arg>, --profile-blocks
.. option:: -all\_load
.. option:: -allowable\_client <arg>
.. option:: --analyze
Run the static analyzer
.. option:: --analyze-auto
.. option:: --analyzer-no-default-checks
.. option:: --analyzer-output<arg>
Static analyzer report output format (html|plist|plist-multi-file|plist-html|text).
.. option:: -ansi, --ansi
.. 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:: --constant-cfstrings
.. option:: -coverage, --coverage
.. 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-gpu-arch=<arg>, --no-cuda-gpu-arch=<arg>
CUDA GPU architecture (e.g. sm_35). May be specified more than once.
.. option:: --cuda-host-only
Compile CUDA code for host only. Has no effect on non-CUDA compilations.
.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug
Enable device-side debug info generation. Disables ptxas optimizations.
.. 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:: -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:: -exported\_symbols\_list <arg>
.. option:: -faligned-new=<arg>
.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals
Use approximate transcendental functions
.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero
Flush denormal floating point values to zero in CUDA 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:: --gcc-toolchain=<arg>, -gcc-toolchain <arg>
Use the gcc toolchain at the given directory
.. option:: -gcodeview
Generate CodeView debug information
.. option:: -headerpad\_max\_install\_names<arg>
.. option:: -help, --help
Display available options
.. option:: --help-hidden
.. 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:: -keep\_private\_externs
.. option:: -lazy\_framework <arg>
.. program:: clang1
.. option:: -lazy\_library <arg>
.. program:: clang
.. option:: -mbig-endian, -EB
.. 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:: -nocudainc
.. option:: -nocudalib
.. option:: -nodefaultlibs
.. option:: -nofixprebinding
.. option:: -nolibc
.. option:: -nomultidefs
.. option:: -nopie, -no-pie
.. option:: -noprebind
.. option:: -noseglinkedit
.. option:: -nostartfiles
.. option:: -nostdinc, --no-standard-includes
.. program:: clang1
.. option:: -nostdinc++
.. program:: clang
Disable standard #include directories for the C++ standard library
.. option:: -nostdlib, --no-standard-libraries
.. 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:: -p, --profile
.. option:: -pagezero\_size<arg>
.. option:: -pg
Enable mcount instrumentation
.. option:: -pie
.. 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-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-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-search-dirs, --print-search-dirs
Print the paths used for finding libraries and programs
.. option:: -private\_bundle
.. option:: -pthread, -no-pthread
Support POSIX threads in generated code
.. option:: -pthreads
.. option:: -rdynamic
.. 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, --shared
.. option:: -shared-libasan
.. option:: -shared-libgcc
.. option:: -single\_module
.. option:: -specs=<arg>, --specs=<arg>
.. option:: -static, --static
.. option:: -static-libgcc
.. option:: -static-libstdc++
.. 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:: -v, --verbose
Show commands to run and use verbose output
.. option:: --verify-debug-info
Verify the binary representation of debug output
.. option:: --version
.. 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:: -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>
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-llvm
Use the LLVM representation for assembler and object files
.. 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
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:: -fcomment-block-commands=<arg>,<arg2>...
Treat each comma separated argument in <arg> as a documentation comment block command
.. 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:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager
Enables an experimental new pass manager in LLVM.
.. option:: -finline-functions, -fno-inline-functions
Inline suitable functions
.. option:: -finline-hint-functions
Inline functions which are (explicitly or implicitly) marked inline
.. option:: -fno-crash-diagnostics
Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash
.. option:: -fno-sanitize-blacklist
Don't use blacklist file for sanitizers
.. option:: -fparse-all-comments
.. 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-use-after-scope, -fno-sanitize-address-use-after-scope
Enable use-after-scope detection in AddressSanitizer
.. option:: -fsanitize-blacklist=<arg>
Path to blacklist file for sanitizers
.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso
Enable control flow integrity (CFI) checks for cross-DSO calls.
.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>...
Specify the type of coverage instrumentation for Sanitizers
.. option:: -fsanitize-link-c++-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
Enable use-after-destroy detection in MemorySanitizer
.. option:: -fsanitize-recover, -fno-sanitize-recover
.. program:: clang1
.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>...
.. program:: clang
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>...
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-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error
.. 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:: --param <arg>, --param=<arg>
.. option:: -std=<arg>, --std=<arg>, --std <arg>
Language standard to compile for
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
Flags controlling how #includes are resolved to files.
.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg>
Add directory to include search path
.. option:: -I-, --include-barrier
Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path
.. 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:: -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
Validate the system headers that a module depends on when loading the module
.. option:: -fprebuilt-module-path=<directory>
Specify the prebuilt module path
.. option:: -i<arg>
.. 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:: --ptxas-path=<arg>
Path to ptxas (used for compiling CUDA code)
.. 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.
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
Flags allowing the state of the preprocessor to be dumped in various ways.
.. option:: -d
.. program:: clang1
.. option:: -d<arg>
.. program:: clang
.. option:: -dA
.. 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
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>
.. option:: -Wframe-larger-than=<arg>
.. option:: -fPIC, -fno-PIC
.. option:: -fPIE, -fno-PIE
.. option:: -faccess-control, -fno-access-control
.. 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-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:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables
.. option:: -fautolink, -fno-autolink
.. 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.
.. option:: -fcaret-diagnostics, -fno-caret-diagnostics
.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg>
.. option:: -fcolor-diagnostics, -fno-color-diagnostics
Use colors in diagnostics
.. option:: -fcommon, -fno-common
.. 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:: -fcoroutines-ts, -fno-coroutines-ts
Enable support for the C++ Coroutines TS
.. option:: -fcoverage-mapping, -fno-coverage-mapping
Generate coverage mapping to enable code coverage analysis
.. option:: -fcreate-profile
.. 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 (ELF Only)
.. 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-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:: -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=<number>
Prevent optimization remarks from being output if they do not have at least this profile count
.. 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:: -fdollars-in-identifiers, -fno-dollars-in-identifiers
Allow '$' in identifiers
.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm
.. option:: -felide-constructors, -fno-elide-constructors
.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols
.. 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:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg>
.. option:: -ferror-limit=<arg>
.. option:: -fexceptions, -fno-exceptions
Enable support for exception handling
.. option:: -fexec-charset=<arg>
.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg>
.. option:: -ffast-math, -fno-fast-math
Allow aggressive, lossy floating-point optimizations
.. option:: -ffinite-math-only, -fno-finite-math-only
.. option:: -ffor-scope, -fno-for-scope
.. option:: -ffp-contract=<arg>
Form fused FP ops (e.g. FMAs): fast (everywhere) | on (according to FP_CONTRACT pragma, default) | off (never fuse)
.. 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 (ELF Only)
.. 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:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities
.. option:: -fhonor-nans, -fno-honor-nans
.. option:: -fhosted
.. 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>
.. option:: -finstrument-functions
Generate calls to instrument function entry and exit
.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as
Enable the integrated assembler
.. option:: -fjump-tables, -fno-jump-tables
.. option:: -flax-vector-conversions, -fno-lax-vector-conversions
.. 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'
.. option:: -fmacro-backtrace-limit=<arg>
.. option:: -fmath-errno, -fno-math-errno
Require math functions to indicate errors by setting errno
.. option:: -fmax-type-align=<arg>
Specify the maximum alignment to enforce on pointers lacking an explicit alignment
.. option:: -fmerge-all-constants, -fno-merge-all-constants
.. option:: -fmessage-length=<arg>
.. option:: -fmodule-file-deps, -fno-module-file-deps
.. option:: -fmodule-file=<file>
Load this precompiled module file
.. option:: -fmodule-map-file=<file>
Load this module map file
.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <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:: -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<arg>
.. 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-operator-names
Do not treat C++ operator name keywords as synonyms for operators
.. option:: -fno-strict-modules-decluse
.. option:: -fno-working-directory
.. option:: -fnoopenmp-use-tls
.. 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-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:: -fomit-frame-pointer, -fno-omit-frame-pointer
.. option:: -fopenmp, -fno-openmp
.. option:: -fopenmp-dump-offload-linker-script
.. option:: -fopenmp-use-tls
.. option:: -fopenmp-version=<arg>
.. program:: clang1
.. option:: -fopenmp=<arg>
.. program:: clang
.. option:: -foperator-arrow-depth=<arg>
.. option:: -foptimization-record-file=<arg>
Specify the file name of any generated YAML optimization record
.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls
.. 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:: -fpcc-struct-return
Override the default ABI to return all structs on the stack
.. option:: -fpch-preprocess
.. option:: -fpic, -fno-pic
.. option:: -fpie, -fno-pie
.. option:: -fplugin=<dsopath>
Load the named plugin (dynamic shared object)
.. option:: -fpreserve-as-comments, -fno-preserve-as-comments
.. option:: -fprofile-arcs, -fno-profile-arcs
.. option:: -fprofile-dir=<arg>
.. 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-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
.. 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:: -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:: -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>
.. program:: clang1
.. option:: -frewrite-map-file=<arg>
.. program:: clang
.. option:: -fropi, -fno-ropi
.. option:: -frtti, -fno-rtti
.. option:: -frwpi, -fno-rwpi
.. option:: -fsave-optimization-record, -fno-save-optimization-record
Generate a YAML optimization record file
.. 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
.. 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
Place debug types in their own section (ELF Only)
.. option:: -fsplit-stack
.. option:: -fstack-protector, -fno-stack-protector
Enable stack protectors for functions potentially vulnerable to stack smashing
.. option:: -fstack-protector-all
Force the usage of stack protectors for all functions
.. option:: -fstack-protector-strong
Use a strong heuristic to apply stack protectors to functions
.. 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-overflow, -fno-strict-overflow
.. option:: -fstrict-return, -fno-strict-return
Always treat control flow paths that fall off the end of a non-void function as unreachable
.. 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:: -ftabstop=<arg>
.. option:: -ftemplate-backtrace-limit=<arg>
.. option:: -ftemplate-depth-<arg>
.. option:: -ftemplate-depth=<arg>
.. option:: -ftest-coverage
.. option:: -fthinlto-index=<arg>
Perform ThinLTO importing using provided function summary index
.. option:: -fthreadsafe-statics, -fno-threadsafe-statics
.. option:: -ftime-report
.. 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:: -funique-section-names, -fno-unique-section-names
Use unique names for text and data sections (ELF Only)
.. 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
Use .init_array instead of .ctors
.. option:: -fuse-ld=<arg>
.. option:: -fuse-line-directives, -fno-use-line-directives
.. option:: -fveclib=<arg>
Use the given vector functions library
.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize
Enable the loop vectorization passes
.. option:: -fverbose-asm, -fno-verbose-asm
.. option:: -fvisibility-inlines-hidden
Give inline C++ member functions default visibility by default
.. option:: -fvisibility-ms-compat
Give global types 'default' visibility and global functions and variables 'hidden' visibility by default
.. option:: -fvisibility=<arg>
Set the default symbol visibility for all global declarations
.. 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:: -fxray-always-instrument=<arg>
Filename defining the whitelist for imbuing the 'always instrument' XRay attribute.
.. 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-never-instrument=<arg>
Filename defining the whitelist for imbuing the 'never instrument' XRay attribute.
.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss
.. option:: -fzvector, -fno-zvector, -mzvector
Enable System z vector language extension
.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic
.. option:: -pedantic-errors, --pedantic-errors
.. 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-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-unsafe-math-optimizations
OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable.
.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg>
Put objects of at most <size> bytes into small data section (MIPS / Hexagon)
.. option:: -m16
.. option:: -m32
.. option:: -m64
.. option:: -mabi=<arg>
.. option:: -mabicalls, -mno-abicalls
Enable SVR4-style position-independent code (Mips only)
.. option:: -malign-double
Align doubles to two words in structs (x86 only)
.. option:: -march=<arg>
.. option:: -masm=<arg>
.. option:: -mbackchain, -mno-backchain
Link stack frames through backchain on System Z
.. option:: -mcheck-zero-division, -mno-check-zero-division
.. option:: -mcmodel=<arg>
.. option:: -mcompact-branches=<arg>
.. option:: -mconsole<arg>
.. option:: -mcpu=<arg>, -mv4 (equivalent to -mcpu=hexagonv4), -mv5 (equivalent to -mcpu=hexagonv5), -mv55 (equivalent to -mcpu=hexagonv55), -mv60 (equivalent to -mcpu=hexagonv60), -mv62 (equivalent to -mcpu=hexagonv62)
.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg>
.. option:: -mdll<arg>
.. option:: -mdouble-float
.. option:: -mdsp, -mno-dsp
.. option:: -mdspr2, -mno-dspr2
.. option:: -mdynamic-no-pic<arg>
.. option:: -meabi <arg>
Set EABI type, e.g. 4, 5 or gnu (default depends on triple)
.. option:: -mfentry
Insert calls to fentry at function entry (x86 only)
.. option:: -mfloat-abi=<arg>
.. option:: -mfp32
Use 32-bit floating point registers (MIPS only)
.. option:: -mfp64
Use 64-bit floating point registers (MIPS only)
.. option:: -mfpmath=<arg>
.. option:: -mfpu=<arg>
.. option:: -mglobal-merge, -mno-global-merge
Enable merging of globals
.. option:: -mgpopt, -mno-gpopt
Use GP relative accesses for symbols known to be in a small data section (MIPS)
.. option:: -mhard-float
.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg>
.. option:: -miamcu, -mno-iamcu
Use Intel MCU ABI
.. 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:: -mips16
.. option:: -mkernel
.. option:: -mldc1-sdc1, -mno-ldc1-sdc1
.. option:: -mlong-calls, -mno-long-calls
Generate branches with extended addressability, usually via indirect jumps.
.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg>
Set Mac OS X deployment target
.. option:: -mmadd4, -mno-madd4
Enable the generation of 4-operand madd.s, madd.d and related instructions.
.. option:: -mmcu=<arg>
.. option:: -mmicromips, -mno-micromips
.. option:: -mms-bitfields, -mno-ms-bitfields
Set the default structure layout to be compatible with the Microsoft compiler standard
.. 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:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer
Omit frame pointer setup for leaf functions
.. option:: -moslib=<arg>
.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations
Use copy relocations support for PIE builds
.. option:: -mqdsp6-compat
Enable hexagon-qdsp6 backward compatibility
.. option:: -mrecip
.. program:: clang1
.. option:: -mrecip=<arg1>,<arg2>...
.. program:: clang
.. option:: -mred-zone, -mno-red-zone
.. option:: -mregparm=<arg>
.. option:: -mrelax-all, -mno-relax-all
(integrated-as) Relax all machine instructions
.. option:: -mrtd, -mno-rtd
Make StdCall calling convention the default
.. option:: -msingle-float
.. option:: -msoft-float, -mno-soft-float
Use software floating point
.. option:: -mstack-alignment=<arg>
Set the stack alignment
.. option:: -mstack-probe-size=<arg>
Set the stack probe size
.. option:: -mstackrealign, -mno-stackrealign
Force realign the stack at entry to every function
.. option:: -mthread-model <arg>
The thread model to use, e.g. posix, single (posix by default)
.. option:: -mthreads<arg>
.. option:: -mthumb, -mno-thumb
.. option:: -mtune=<arg>
.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg>
.. option:: -municode<arg>
.. option:: -mvx, -mno-vx
.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings
.. option:: -mwatchos-version-min=<arg>
.. option:: -mwindows<arg>
.. option:: -mx32
.. option:: -mxgot, -mno-xgot
.. option:: -ffixed-x18
Reserve the x18 register (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:: -ffixed-r9
Reserve the r9 register (ARM only)
.. option:: -mcrc
Allow use of CRC instructions (ARM only)
.. 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:: -munaligned-access, -mno-unaligned-access
Allow memory accesses to be unaligned (AArch32/AArch64 only)
.. option:: -mhvx, -mno-hvx
Enable Hexagon Vector eXtensions
.. option:: -mhvx-double, -mno-hvx-double
Enable Hexagon Double Vector eXtensions
.. option:: -mieee-rnd-near
.. option:: -maltivec, -mno-altivec
.. option:: -mcmpb, -mno-cmpb
.. option:: -mcrbits, -mno-crbits
.. option:: -mcrypto, -mno-crypto
.. option:: -mdirect-move, -mno-direct-move
.. 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:: -mpopcntd, -mno-popcntd
.. option:: -mpower8-vector, -mno-power8-vector
.. option:: -mpower9-vector, -mno-power9-vector
.. option:: -mqpx, -mno-qpx
.. option:: -mvsx, -mno-vsx
.. option:: -msimd128, -mno-simd128
.. option:: -m3dnow, -mno-3dnow
.. option:: -m3dnowa, -mno-3dnowa
.. option:: -madx, -mno-adx
.. option:: -maes, -mno-aes
.. option:: -mavx, -mno-avx
.. option:: -mavx2, -mno-avx2
.. 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:: -mavx512vl, -mno-avx512vl
.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq
.. option:: -mbmi, -mno-bmi
.. option:: -mbmi2, -mno-bmi2
.. option:: -mclflushopt, -mno-clflushopt
.. option:: -mclwb, -mno-clwb
.. option:: -mclzero, -mno-clzero
.. option:: -mcx16, -mno-cx16
.. option:: -mf16c, -mno-f16c
.. option:: -mfma, -mno-fma
.. option:: -mfma4, -mno-fma4
.. option:: -mfsgsbase, -mno-fsgsbase
.. option:: -mfxsr, -mno-fxsr
.. option:: -mlwp, -mno-lwp
.. option:: -mlzcnt, -mno-lzcnt
.. option:: -mmmx, -mno-mmx
.. option:: -mmovbe, -mno-movbe
.. option:: -mmpx, -mno-mpx
.. option:: -mmwaitx, -mno-mwaitx
.. option:: -mpclmul, -mno-pclmul
.. option:: -mpku, -mno-pku
.. option:: -mpopcnt, -mno-popcnt
.. option:: -mprefetchwt1, -mno-prefetchwt1
.. option:: -mprfchw, -mno-prfchw
.. option:: -mrdrnd, -mno-rdrnd
.. option:: -mrdseed, -mno-rdseed
.. option:: -mrtm, -mno-rtm
.. option:: -msgx, -mno-sgx
.. option:: -msha, -mno-sha
.. 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:: -mx87, -m80387, -mno-x87
.. option:: -mxop, -mno-xop
.. option:: -mxsave, -mno-xsave
.. option:: -mxsavec, -mno-xsavec
.. option:: -mxsaveopt, -mno-xsaveopt
.. option:: -mxsaves, -mno-xsaves
Flags controlling how much optimization should be performed.
.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg>
.. option:: -Ofast<arg>
Flags controlling how much and what kind of debug information should be generated.
.. option:: -g, --debug, --debug=<arg>
Generate source-level debug information
.. 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, -gdwarf
Generate source-level debug information with dwarf version 4
.. option:: -gdwarf-5
Generate source-level debug information with dwarf version 5
.. option:: -gfull
.. option:: -gused
.. option:: -g0
.. option:: -g2
.. option:: -g3
.. option:: -ggdb0
.. option:: -ggdb1
.. option:: -ggdb2
.. option:: -ggdb3
.. 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
.. option:: -ggdb
.. option:: -glldb
.. option:: -gsce
.. option:: -gcolumn-info, -gno-column-info
.. option:: -gdwarf-aranges
.. option:: -ggnu-pubnames
.. option:: -grecord-gcc-switches, -gno-record-gcc-switches
.. option:: -gsplit-dwarf
.. option:: -gstrict-dwarf, -gno-strict-dwarf
.. option:: -gz
DWARF debug sections compression type
.. program:: clang1
.. option:: -gz=<arg>
.. program:: clang
DWARF debug sections compression type
Flags controlling the behavior of the Clang Static Analyzer.
.. option:: -Xanalyzer <arg>
Pass <arg> to the static analyzer
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:: -J<arg>
.. option:: -cpp
.. 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:: -fbackslash, -fno-backslash
.. 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:: -fdefault-double-8, -fno-default-double-8
.. option:: -fdefault-integer-8, -fno-default-integer-8
.. option:: -fdefault-real-8, -fno-default-real-8
.. 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:: -ffixed-form, -fno-fixed-form
.. option:: -ffixed-line-length-<arg>
.. option:: -ffpe-trap=<arg>
.. option:: -ffree-form, -fno-free-form
.. option:: -ffree-line-length-<arg>
.. option:: -ffrontend-optimize, -fno-frontend-optimize
.. option:: -fimplicit-none, -fno-implicit-none
.. 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:: -fintrinsic-modules-path, -fno-intrinsic-modules-path
.. 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:: -nocpp
.. option:: -static-libgfortran
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 BSS to <addr>
.. option:: -Ttext<addr>
Set starting address of BSS 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:: -e<arg>, --entry
.. option:: -filelist <arg>
.. option:: -l<arg>
.. option:: -r
.. option:: -rpath <arg>
.. option:: -s
.. 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