clang <command...>

Clang LLVM compiler

Arguments

NameDescription
commandfilepaths

Options

NameDescription
-###Print (but do not run) the commands to run for this compilation
--analyzer-output <command>Static analyzer report output format
--analyzeRun the static analyzer
-arcmt-migrate-emit-errorsEmit ARC errors even if the migrator can fix them
-arcmt-migrate-report-output <command>Output path for the plist report
-B <command>Add <dir> to search path for binaries and object files used implicitly
-CCInclude comments from within macros in preprocessed output
-cl-denorms-are-zeroOpenCL only. Allow denormals to be flushed to zero
-cl-fast-relaxed-mathOpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines __FAST_RELAXED_MATH__
-cl-finite-math-onlyOpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf
-cl-fp32-correctly-rounded-divide-sqrtOpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded
-cl-kernel-arg-infoOpenCL only. Generate kernel argument metadata
-cl-mad-enableOpenCL only. Allow use of less precise MAD computations in the generated binary
-cl-no-signed-zerosOpenCL only. Allow use of less precise no signed zeros computations in the generated binary
-cl-opt-disableOpenCL only. This option disables all optimizations. By default optimizations are enabled
-cl-single-precision-constantOpenCL only. Treat double precision floating-point constant as single precision constant
-cl-std <command>OpenCL language standard to compile for
-cl-strict-aliasingOpenCL only. This option is added for compatibility with OpenCL 1.0
-cl-uniform-work-group-sizeOpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel
-cl-unsafe-math-optimizationsOpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable
--config <command>Specifies configuration file
--cuda-compile-host-deviceCompile CUDA code for both host and device (default). Has no effect on non-CUDA compilations
--cuda-device-onlyCompile CUDA code for device only
--cuda-host-onlyCompile CUDA code for host only. Has no effect on non-CUDA compilations
--cuda-include-ptx <command>Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once
--cuda-noopt-device-debugEnable device-side debug info generation. Disables ptxas optimizations
--cuda-path-ignore-envIgnore environment variables to detect CUDA installation
--cuda-path <command>CUDA installation path
-cxx-isystem <command>Add directory to the C++ SYSTEM include search path
-CInclude comments in preprocessed output
-cOnly run preprocess, compile, and assemble steps
-dDPrint macro definitions in -E mode in addition to normal output
-dependency-dot <command>Filename to write DOT-formatted header dependencies to
-dependency-file <command>Filename (or -) to write dependency output to
-dIPrint include directives in -E mode in addition to normal output
-dMPrint macro definitions in -E mode instead of normal output
-dsym-dir <command>Directory to output dSYM's (if any) to
-D <command>=<value> Define <macro> to <value> (or 1 if <value> omitted)
-emit-astEmit Clang AST files for source inputs
-emit-interface-stubsGenerate Interface Stub Files
-emit-llvmUse the LLVM representation for assembler and object files
-emit-merged-ifsGenerate Interface Stub Files, emit merged text not binary
--emit-static-libEnable linker job to emit a static library
-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clangTrivial 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
-EOnly run the preprocessor
-faapcs-bitfield-loadFollows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only)
-faapcs-bitfield-widthFollow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only)
-faccess-control
-faddrsigEmit an address-significance table
-faligned-allocationEnable C++17 aligned allocation functions
-fallow-editor-placeholdersTreat editor placeholders as valid source code
-fansi-escape-codesUse ANSI escape codes for diagnostics
-fapinotes-cache-path <command>Does nothing; API notes are no longer cached separately from modules
-fapinotes-modulesEnable module-based external API notes support
-fapinotes-swift-version <command>Specify the Swift version to use when filtering API notes
-fapinotesEnable external API notes support
-fapple-kextUse Apple's kernel extensions ABI
-fapple-link-rtlibForce linking the clang builtins runtime library
-fapple-pragma-packEnable Apple gcc-compatible #pragma pack handling
-fapplication-extensionRestrict code to those available for App Extensions
-fasm-blocks
-fautolink
-fbasic-block-sections <command>Place each function's basic blocks in unique sections (ELF Only) : all | labels | none | list=<file>
-fblocksEnable the 'blocks' language feature
-fborland-extensionsAccept non-standard constructs supported by the Borland compiler
-fbranch-target-identificationEmit branch target identification instructions for indirect branch destinations
-fbuild-session-file <command>Use the last modification time of <file> as the build session timestamp
-fbuild-session-timestamp <command>Time when the current build session started
-fbuiltin-module-mapLoad the clang builtins module map file
-fc++-static-destructors
-fcall-saved-x10Make the x10 register call-saved (AArch64 only)
-fcall-saved-x11Make the x11 register call-saved (AArch64 only)
-fcall-saved-x12Make the x12 register call-saved (AArch64 only)
-fcall-saved-x13Make the x13 register call-saved (AArch64 only)
-fcall-saved-x14Make the x14 register call-saved (AArch64 only)
-fcall-saved-x15Make the x15 register call-saved (AArch64 only)
-fcall-saved-x18Make the x18 register call-saved (AArch64 only)
-fcall-saved-x8Make the x8 register call-saved (AArch64 only)
-fcall-saved-x9Make the x9 register call-saved (AArch64 only)
-fcaret-diagnostics
-fcf-protection [command]Instrument control-flow architecture protection
-fchar8_tEnable C++ builtin type char8_t
-fclang-abi-compat <command>Attempt to match the ABI of Clang <version>
-fcolor-diagnosticsEnable colors in diagnostics
-fcomment-block-commands <command>Treat each comma separated argument in <arg> as a documentation comment block command
-fcommonPlace uninitialized global variables in a common block
-fcomplete-member-pointersRequire member pointer base types to be complete if they would be significant under the Microsoft ABI
-fconstant-cfstrings
-fconvergent-functionsAssume functions may be convergent
-fcoroutines-tsEnable support for the C++ Coroutines TS
-fcoverage-mappingGenerate coverage mapping to enable code coverage analysis
-fcs-profile-generate [command]Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fcuda-approx-transcendentalsUse approximate transcendental functions
-fcuda-flush-denormals-to-zeroFlush denormal floating point values to zero in CUDA device mode
-fcuda-short-ptrUse 32-bit pointers for accessing const/local/shared address spaces
-fcxx-exceptionsEnable C++ exceptions
-fdata-sectionsPlace each data in its own section
-fdebug-compilation-dir <command>The compilation directory to embed in the debug info
-fdebug-default-version <command>Default DWARF version to use, if a -g option caused DWARF debug info to be produced
-fdebug-info-for-profilingEmit extra debug info to make sample profile more accurate
-fdebug-macroEmit macro debug information
-fdebug-prefix-map <command>Remap file source paths in debug info
-fdebug-ranges-base-addressUse DWARF base address selection entries in .debug_ranges
-fdebug-types-sectionPlace debug types in their own section (ELF Only)
-fdeclspecAllow __declspec as a keyword
-fdelayed-template-parsingParse templated function definitions at the end of the translation unit
-fdelete-null-pointer-checksTreat usage of null pointers as undefined behavior (default)
-fdiagnostics-absolute-pathsPrint absolute paths in diagnostics
-fdiagnostics-hotness-threshold <command>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
-fdiagnostics-parseable-fixitsPrint fix-its in machine parseable form
-fdiagnostics-print-source-range-infoPrint source range spans in numeric form
-fdiagnostics-show-hotnessEnable profile hotness information in diagnostic line
-fdiagnostics-show-note-include-stackDisplay include stacks for diagnostic notes
-fdiagnostics-show-optionPrint option name with mappable diagnostics
-fdiagnostics-show-template-treePrint a template comparison tree for differing templates
-fdigraphsEnable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default)
-fdiscard-value-namesDiscard value names in LLVM IR
-fdollars-in-identifiersAllow '$' in identifiers
-fdouble-square-bracket-attributesEnable '[[]]' attributes in all C and C++ language modes
-fdwarf-directory-asm
-fdwarf-exceptionsUse DWARF style exceptions
-felide-constructors
-feliminate-unused-debug-typesDo not emit debug info for defined but unused types
-fembed-bitcode-markerEmbed placeholder LLVM IR data as a marker
-fembed-bitcode [command]Embed LLVM bitcode
-femit-all-declsEmit all declarations, even if unused
-femulated-tlsUse emutls functions to access thread_local variables
-fenable-matrixEnable matrix data type and related builtin functions
-fescaping-block-tail-calls
-fexceptionsEnable support for exception handling
-fexperimental-new-constant-interpreterEnable the experimental new constant interpreter
-fexperimental-relative-c++-abi-vtablesUse the experimental C++ class ABI for classes with virtual tables
-fexperimental-strict-floating-pointEnables experimental strict floating point in LLVM
-ffast-mathAllow aggressive, lossy floating-point optimizations
-ffile-prefix-map <command>Remap file source paths in debug info and predefined preprocessor macros
-ffine-grained-bitfield-accessesUse separate accesses for consecutive bitfield runs with legal widths and alignments
-ffinite-loopsAssume all loops are finite
-ffinite-math-only
-ffixed-pointEnable fixed point types
-ffixed-r19Reserve register r19 (Hexagon only)
-ffixed-r9Reserve the r9 register (ARM only)
-ffixed-x10Reserve the x10 register (AArch64/RISC-V only)
-ffixed-x11Reserve the x11 register (AArch64/RISC-V only)
-ffixed-x12Reserve the x12 register (AArch64/RISC-V only)
-ffixed-x13Reserve the x13 register (AArch64/RISC-V only)
-ffixed-x14Reserve the x14 register (AArch64/RISC-V only)
-ffixed-x15Reserve the x15 register (AArch64/RISC-V only)
-ffixed-x16Reserve the x16 register (AArch64/RISC-V only)
-ffixed-x17Reserve the x17 register (AArch64/RISC-V only)
-ffixed-x18Reserve the x18 register (AArch64/RISC-V only)
-ffixed-x19Reserve the x19 register (AArch64/RISC-V only)
-ffixed-x1Reserve the x1 register (AArch64/RISC-V only)
-ffixed-x20Reserve the x20 register (AArch64/RISC-V only)
-ffixed-x21Reserve the x21 register (AArch64/RISC-V only)
-ffixed-x22Reserve the x22 register (AArch64/RISC-V only)
-ffixed-x23Reserve the x23 register (AArch64/RISC-V only)
-ffixed-x24Reserve the x24 register (AArch64/RISC-V only)
-ffixed-x25Reserve the x25 register (AArch64/RISC-V only)
-ffixed-x26Reserve the x26 register (AArch64/RISC-V only)
-ffixed-x27Reserve the x27 register (AArch64/RISC-V only)
-ffixed-x28Reserve the x28 register (AArch64/RISC-V only)
-ffixed-x29Reserve the x29 register (AArch64/RISC-V only)
-ffixed-x2Reserve the x2 register (AArch64/RISC-V only)
-ffixed-x30Reserve the x30 register (AArch64/RISC-V only)
-ffixed-x31Reserve the x31 register (AArch64/RISC-V only)
-ffixed-x3Reserve the x3 register (AArch64/RISC-V only)
-ffixed-x4Reserve the x4 register (AArch64/RISC-V only)
-ffixed-x5Reserve the x5 register (AArch64/RISC-V only)
-ffixed-x6Reserve the x6 register (AArch64/RISC-V only)
-ffixed-x7Reserve the x7 register (AArch64/RISC-V only)
-ffixed-x8Reserve the x8 register (AArch64/RISC-V only)
-ffixed-x9Reserve the x9 register (AArch64/RISC-V only)
-fforce-dwarf-frameAlways emit a debug frame section
-fforce-emit-vtablesEmits more virtual tables to improve devirtualization
-fforce-enable-int128Enable support for int128_t type
-ffp-contract <command>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
-ffp-exception-behavior <command>Specifies the exception behavior of floating-point operations
-ffp-model <command>Controls the semantics of floating-point calculations
-ffreestandingAssert that the compilation takes place in a freestanding environment
-ffunction-sectionsPlace each function in its own section
-fglobal-iselEnables the global instruction selector
-fgnu-inline-asm
-fgnu-keywordsAllow GNU-extension keywords regardless of language standard
-fgnu-runtimeGenerate output compatible with the standard GNU Objective-C runtime
-fgnu89-inlineUse the gnu89 inline semantics
-fgnuc-version <command>Sets various macros to claim compatibility with the given GCC version (default is 4.2.1)
-fgpu-allow-device-initAllow device side init function in HIP
-fgpu-defer-diagDefer host/device related diagnostic messages for CUDA/HIP
-fgpu-rdcGenerate relocatable device code, also known as separate compilation mode
-fhip-new-launch-apiUse new kernel launching API for HIP
-fignore-exceptionsEnable support for ignoring exception handling constructs
-fimplicit-module-mapsImplicitly search the file system for module map files
-fimplicit-modules
-finline-functionsInline suitable functions
-finline-hint-functionsInline functions which are (explicitly or implicitly) marked inline
-finstrument-function-entry-bareInstrument function entry only, after inlining, without arguments to the instrumentation call
-finstrument-functions-after-inliningLike -finstrument-functions, but insert the calls after inlining
-finstrument-functionsGenerate calls to instrument function entry and exit
-fintegrated-asEnable the integrated assembler
-fintegrated-cc1Run cc1 in-process
-fjump-tablesUse jump tables for lowering switches
-fkeep-static-constsKeep static const variables if unused
-flax-vector-conversions <command>Enable implicit vector bit-casts
-flegacy-pass-managerUse the legacy pass manager in LLVM
-flto-jobs <command>Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected)
-flto [command]Set LTO mode to either 'full' or 'thin'
-fmacro-prefix-map <command>Remap file source paths in predefined preprocessor macros
-fmath-errnoRequire math functions to indicate errors by setting errno
-fmax-tokens <command>Max total number of preprocessed tokens for -Wmax-tokens
-fmax-type-align <command>Specify the maximum alignment to enforce on pointers lacking an explicit alignment
-fmemory-profile [command]Enable heap memory profiling and dump results into <directory>
-fmerge-all-constantsAllow merging of constants
-fmessage-length <command>Format message diagnostics so that they fit within N columns
-fmodule-file[<name>=]<file> Specify the mapping of module name to precompiled module file, or load a module file if name is omitted
-fmodule-map-file <command>Load this module map file
-fmodule-name <command>Specify the name of the module to build
-fmodules-cache-path <command>Specify the module cache path
-fmodules-decluseRequire declaration of modules used within a module
-fmodules-disable-diagnostic-validationDisable validation of the diagnostic options when loading the module
-fmodules-ignore-macro <command>Ignore the definition of the given macro when building and loading modules
-fmodules-prune-after <command>Specify the interval (in seconds) after which a module file will be considered unused
-fmodules-prune-interval <command>Specify the interval (in seconds) between attempts to prune the module cache
-fmodules-search-allSearch even non-imported modules to resolve references
-fmodules-strict-decluseLike -fmodules-decluse but requires all headers to be in modules
-fmodules-tsEnable support for the C++ Modules TS
-fmodules-user-build-path <command>Specify the module user build path
-fmodules-validate-input-files-contentValidate PCM input files based on content if mtime differs
-fmodules-validate-once-per-build-sessionDon't verify input files for the modules if the module has been successfully validated or loaded during this build session
-fmodules-validate-system-headersValidate the system headers that a module depends on when loading the module
-fmodulesEnable the 'modules' language feature
-fms-compatibility-version <command>Dot-separated value representing the Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fms-compatibilityEnable full Microsoft Visual C++ compatibility
-fms-extensionsAccept some non-standard constructs supported by the Microsoft compiler
-fmsc-version <command>Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fnew-alignment <command>Specifies the largest alignment guaranteed by '::operator new(size_t)'
-fno-aapcs-bitfield-widthDo not follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only)
-fno-access-controlDisable C++ access control
-fno-addrsigDon't emit an address-significance table
-fno-allow-editor-placeholders
-fno-apinotes-modulesDisable module-based external API notes support
-fno-apinotesDisable external API notes support
-fno-apple-pragma-pack
-fno-application-extension
-fno-asm-blocks
-fno-assume-sane-operator-newDon't assume that C++'s global operator new can't alias any pointer
-fno-autolinkDisable generation of linker directives for automatic library linking
-fno-blocks
-fno-borland-extensions
-fno-builtin-value <arg>Disable implicit builtin knowledge of a specific function
-fno-builtinDisable implicit builtin knowledge of functions
-fno-c++-static-destructorsDisable C++ static destructor registration
-fno-caret-diagnostics
-fno-char8_tDisable C++ builtin type char8_t
-fno-color-diagnosticsDisable colors in diagnostics
-fno-commonCompile common globals like normal definitions
-fno-complete-member-pointersDo not require member pointer base types to be complete if they would be significant under the Microsoft ABI
-fno-constant-cfstringsDisable creation of CodeFoundation-type constant strings
-fno-constant-nsarray-literalsDisable creation of CodeFoundation-type constant initializer `NSArray`s from array literals
-fno-constant-nsdictionary-literalsDisable creation of CodeFoundation-type constant initializer `NSDictionary`s from dictionary literals
-fno-constant-nsnumber-literalsDisable creation of CodeFoundation-type constant initializer `NSNumber`s from number literals
-fno-coroutines-ts
-fno-coverage-mappingDisable code coverage analysis
-fno-crash-diagnosticsDisable auto-generation of preprocessed source files and a script for reproduction during a clang crash
-fno-cuda-approx-transcendentalsDon't use approximate transcendental functions
-fno-cuda-short-ptr
-fno-cxx-exceptions
-fno-cxx-modulesDisable modules for C++
-fno-data-sections
-fno-debug-info-for-profiling
-fno-debug-macroDo not emit macro debug information
-fno-debug-ranges-base-address
-fno-declspecDisallow __declspec as a keyword
-fno-delayed-template-parsingDisable delayed template parsing
-fno-delete-null-pointer-checksDo not treat usage of null pointers as undefined behavior
-fno-diagnostics-fixit-infoDo not include fixit information in diagnostics
-fno-diagnostics-show-hotness
-fno-digraphsDisallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:'
-fno-discard-value-namesDo not discard value names in LLVM IR
-fno-dollars-in-identifiersDisallow '$' in identifiers
-fno-double-square-bracket-attributesDisable '[[]]' attributes in all C and C++ language modes
-fno-dwarf-directory-asm
-fno-elide-constructorsDisable C++ copy constructor elision
-fno-elide-typeDo not elide types when printing diagnostics
-fno-eliminate-unused-debug-typesEmit debug info for defined but unused types
-fno-escaping-block-tail-calls
-fno-exceptionsDisable support for exception handling
-fno-experimental-relative-c++-abi-vtablesDo not use the experimental C++ class ABI for classes with virtual tables
-fno-fast-math
-fno-fine-grained-bitfield-accessesUse large-integer access for consecutive bitfield runs
-fno-finite-loopsDo not assume that any loop is finite
-fno-finite-math-only
-fno-fixed-pointDisable fixed point types
-fno-force-dwarf-frame
-fno-force-emit-vtables
-fno-force-enable-int128Disable support for int128_t type
-fno-function-sections
-fno-global-iselDisables the global instruction selector
-fno-gnu-inline-asmDisable GNU style inline asm
-fno-gnu89-inline
-fno-gpu-allow-device-initDon't allow device side init function in HIP
-fno-gpu-defer-diagDon't defer host/device related diagnostic messages for CUDA/HIP
-fno-gpu-rdc
-fno-hip-new-launch-apiDon't use new kernel launching API for HIP
-fno-implicit-modules
-fno-integrated-asDisable the integrated assembler
-fno-integrated-cc1Spawn a separate process for each cc1
-fno-jump-tablesDo not use jump tables for lowering switches
-fno-keep-static-constsDon't keep static const variables if unused
-fno-legacy-pass-managerUse the new pass manager in LLVM
-fno-ltoDisable LTO mode (default)
-fno-math-errno
-fno-memory-profileDisable heap memory profiling
-fno-merge-all-constantsDisallow merging of constants
-fno-modules-validate-system-headers
-fno-objc-arc-exceptions
-fno-objc-convert-messages-to-runtime-calls
-fno-objc-encode-cxx-class-template-spec
-fno-objc-exceptions
-fno-objc-infer-related-result-typeDo not infer Objective-C related result type based on method family
-fno-operator-namesDo not treat C++ operator name keywords as synonyms for operators
-fno-pascal-strings
-fno-pch-codegenDo not generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fno-pch-debuginfoDo not generate debug info for types in an object file built from this PCH and do not generate them elsewhere
-fno-pch-instantiate-templates
-fno-pltUse GOT indirection instead of PLT to make external function calls (x86 only)
-fno-prebuilt-implicit-modules
-fno-preserve-as-commentsDo not preserve comments in inline assembly
-fno-profile-arcs
-fno-profile-generateDisable generation of profile instrumentation
-fno-profile-instr-generateDisable generation of profile instrumentation
-fno-profile-instr-useDisable using instrumentation data for profile-guided optimization
-fno-pseudo-probe-for-profilingDo not emit pseudo probes for sample profiler
-fno-ptrauth-abi-versionDisable Pointer Authentication ABI versioning
-fno-ptrauth-kernel-abi-versionDisable Pointer Authentication kernel ABI versioning
-fno-reciprocal-math
-fno-register-global-dtors-with-atexitDon't use atexit or __cxa_atexit to register global destructors
-fno-relaxed-template-template-args
-fno-reroll-loops
-fno-rewrite-imports
-fno-rewrite-includes
-fno-ropi
-fno-rtlib-add-rpathDo not add -rpath with architecture-specific resource directory to the linker flags
-fno-rtti-dataDisable generation of RTTI data
-fno-rttiDisable generation of rtti information
-fno-rwpi
-fno-sanitize-address-poison-custom-array-cookieDisable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fno-sanitize-address-use-after-scopeDisable use-after-scope detection in AddressSanitizer
-fno-sanitize-address-use-odr-indicatorDisable ODR indicator globals
-fno-sanitize-blacklistDon't use blacklist file for sanitizers
-fno-sanitize-cfi-canonical-jump-tablesDo not make the jump table addresses canonical in the symbol table
-fno-sanitize-cfi-cross-dsoDisable control flow integrity (CFI) checks for cross-DSO calls
-fno-sanitize-coverage <command>Disable specified features of coverage instrumentation for Sanitizers
-fno-sanitize-memory-track-originsDisable origins tracking in MemorySanitizer
-fno-sanitize-memory-use-after-dtorDisable use-after-destroy detection in MemorySanitizer
-fno-sanitize-minimal-runtime
-fno-sanitize-recover <command>Disable recovery for specified sanitizers
-fno-sanitize-statsDisable sanitizer statistics gathering
-fno-sanitize-thread-atomicsDisable atomic operations instrumentation in ThreadSanitizer
-fno-sanitize-thread-func-entry-exitDisable function entry/exit instrumentation in ThreadSanitizer
-fno-sanitize-thread-memory-accessDisable memory access instrumentation in ThreadSanitizer
-fno-sanitize-trap [command]Disable trapping for sanitizers
-fno-semantic-interposition
-fno-short-enums
-fno-short-wcharForce wchar_t to be an unsigned int
-fno-show-columnDo not include column number on diagnostics
-fno-show-source-locationDo not include source location information with diagnostics
-fno-signed-charChar is unsigned
-fno-signed-zerosAllow optimizations that ignore the sign of floating point zeros
-fno-sized-deallocation
-fno-spell-checkingDisable spell-checking
-fno-split-dwarf-inlining
-fno-split-lto-unit
-fno-split-machine-functionsDisable late function splitting using profile information (x86 ELF)
-fno-stack-checkDisable stack checking
-fno-stack-clash-protectionDisable stack clash protection
-fno-stack-protectorDisable the use of stack protectors
-fno-stack-size-section
-fno-standalone-debugLimit debug information produced to reduce size of debug binary
-fno-strict-float-cast-overflowRelax language rules and try to match the behavior of the target's native float-to-int conversion instructions
-fno-strict-returnDon't treat control flow paths that fall off the end of a non-void function as unreachable
-fno-strict-vtable-pointers
-fno-syclDisable SYCL kernels compilation for device
-fno-temp-fileDirectly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes
-fno-test-coverage
-fno-threadsafe-staticsDo not emit code to make initialization of local statics thread safe
-fno-trigraphsDo not process trigraph sequences
-fno-unique-basic-block-section-names
-fno-unique-internal-linkage-names
-fno-unique-section-namesDon't use unique names for text and data sections
-fno-unroll-loopsTurn off loop unroller
-fno-use-cxa-atexitDon't use __cxa_atexit for calling destructors
-fno-use-init-arrayUse .ctors/.dtors instead of .init_array/.fini_array
-fno-use-line-directives
-fno-virtual-function-elimination
-fno-visibility-from-dllstorageclass
-fno-visibility-inlines-hidden-static-local-varDisables -fvisibility-inlines-hidden-static-local-var (this is the default on non-darwin targets)
-fno-whole-program-vtables
-fno-xray-always-emit-customevents
-fno-xray-always-emit-typedevents
-fno-xray-function-indexOmit function index section at the expense of single-function patching performance
-fno-xray-ignore-loops
-fno-xray-instrument
-fno-zero-initialized-in-bssDon't place zero initialized data in BSS
-fno-zvector
-fobjc-arc-exceptionsUse EH-safe code when synthesizing retains and releases in -fobjc-arc
-fobjc-arcSynthesize retain and release calls for Objective-C pointers
-fobjc-convert-messages-to-runtime-calls
-fobjc-disable-direct-methods-for-testingIgnore attribute objc_direct so that direct methods can be tested
-fobjc-encode-cxx-class-template-specFully encode c++ class template specialization
-fobjc-exceptionsEnable Objective-C exceptions
-fobjc-infer-related-result-type
-fobjc-relative-method-listsEnable relative method lists
-fobjc-runtime <command>Specify the target Objective-C runtime kind and version
-fobjc-weakEnable ARC-style weak references in Objective-C
-fopenmp-simdEmit OpenMP code only for SIMD-based constructs
-fopenmp-targets <command>Specify comma-separated list of triples OpenMP offloading targets to be supported
-fopenmpParse OpenMP pragmas and generate parallel code
-foptimization-record-file <command>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
-foptimization-record-passes <command>Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes)
-forder-file-instrumentationGenerate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
-fpack-struct <command>Specify the default maximum struct packing alignment
-fpascal-stringsRecognize and construct Pascal-style string literals
-fpass-plugin <command>Load pass plugin from a dynamic shared object file (only with new pass manager)
-fpatchable-function-entry <command>Generate M NOPs before function entry and N-M NOPs after function entry
-fpcc-struct-returnOverride the default ABI to return all structs on the stack
-fpch-codegenGenerate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fpch-debuginfoGenerate debug info for types in an object file built from this PCH and do not generate them elsewhere
-fpch-instantiate-templatesInstantiate templates already while building a PCH
-fpch-validate-input-files-contentValidate PCH input files based on content if mtime differs
-fplt
-fplugin <command>Load the named plugin (dynamic shared object)
-fprebuilt-implicit-modulesLook up implicit modules in the prebuilt module path
-fprebuilt-module-path <command>Specify the prebuilt module path
-fpreserve-as-comments
-fproc-stat-report <command>Save subprocess statistics to the given file
-fproc-stat-reportvalue <arg>Print subprocess statistics
-fprofile-arcs
-fprofile-exclude-files <command>Instrument only functions from files where names don't match all the regexes separated by a semi-colon
-fprofile-filter-files <command>Instrument only functions from files where names match any regex separated by a semi-colon
-fprofile-generate [command]Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fprofile-instr-generate [command]Generate instrumented code to collect execution counts into <file> (overridden by LLVM_PROFILE_FILE env var)
-fprofile-instr-use <command>Use instrumentation data for profile-guided optimization
-fprofile-remapping-file <command>Use the remappings described in <file> to match the profile data against names in the program
-fprofile-sample-accurateSpecifies that the sample profile is accurate
-fprofile-sample-use <command>Enable sample-based profile guided optimizations
-fprofile-update <command>Set update method of profile counters (atomic,prefer-atomic,single)
-fprofile-use <command>Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>
-fpseudo-probe-for-profilingEmit pseudo probes for sample profiler
-fptrauth-abi-version <command>Pointer Authentication ABI version
-fptrauth-auth-trapsEnable traps on authentication failures
-fptrauth-block-descriptor-pointersEnable signing block descriptors
-fptrauth-callsEnable signing and authentication of all indirect calls
-fptrauth-function-pointer-type-discriminationEnabling type discrimination on C function pointers
-fptrauth-indirect-gotosEnable signing and authentication of indirect goto targets
-fptrauth-intrinsicsEnable pointer-authentication intrinsics
-fptrauth-kernel-abi-versionEnable Pointer Authentication kernel ABI version
-fptrauth-objc-isa-maskingPre- and post-authentication masking mode of objective-c isa pointers
-fptrauth-objc-isa-mode <command>Authentication mode for ObjC isa field. Full auth if unspecified
-fptrauth-objc-isaEnable signing and authentication of Objective-C object's 'isa' field
-fptrauth-returnsEnable signing and authentication of return addresses
-fptrauth-softEnable software lowering of pointer authentication
-fptrauth-vtable-pointer-address-discriminationEnable address discrimination of vtable pointers
-fptrauth-vtable-pointer-type-discriminationEnable type discrimination of vtable pointers
-freciprocal-mathAllow division operations to be reassociated
-freg-struct-returnOverride the default ABI to return small structs in registers
-fregister-global-dtors-with-atexitUse atexit or __cxa_atexit to register global destructors
-frelaxed-template-template-argsEnable C++17 relaxed template template argument matching
-freroll-loopsTurn on loop reroller
-frewrite-imports
-frewrite-includes
-fropiGenerate read-only position independent code (ARM only)
-frtlib-add-rpathAdd -rpath with architecture-specific resource directory to the linker flags
-frtti-data
-frtti
-frwpiGenerate read-write position independent code (ARM only)
-fsanitize-address-field-padding <command>Level of field padding for AddressSanitizer
-fsanitize-address-globals-dead-strippingEnable linker dead stripping of globals in AddressSanitizer
-fsanitize-address-poison-custom-array-cookieEnable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fsanitize-address-use-after-scopeEnable use-after-scope detection in AddressSanitizer
-fsanitize-address-use-odr-indicatorEnable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size
-fsanitize-blacklist <command>Path to blacklist file for sanitizers
-fsanitize-cfi-canonical-jump-tablesMake the jump table addresses canonical in the symbol table
-fsanitize-cfi-cross-dsoEnable control flow integrity (CFI) checks for cross-DSO calls
-fsanitize-cfi-icall-generalize-pointersGeneralize pointers in CFI indirect call type signature checks
-fsanitize-coverage-allowlist <command>Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones
-fsanitize-coverage-blacklist <command>Deprecated, use -fsanitize-coverage-blocklist= instead
-fsanitize-coverage-blocklist <command>Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones
-fsanitize-coverage-whitelist <command>Deprecated, use -fsanitize-coverage-allowlist= instead
-fsanitize-coverage <command>Specify the type of coverage instrumentation for Sanitizers
-fsanitize-hwaddress-abi <command>Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused
-fsanitize-memory-track-origins [command]Enable origins tracking in MemorySanitizer
-fsanitize-memory-use-after-dtorEnable use-after-destroy detection in MemorySanitizer
-fsanitize-minimal-runtime
-fsanitize-recover <command>Enable recovery for specified sanitizers
-fsanitize-statsEnable sanitizer statistics gathering
-fsanitize-system-blacklist <command>Path to system blacklist file for sanitizers
-fsanitize-thread-atomicsEnable atomic operations instrumentation in ThreadSanitizer (default)
-fsanitize-thread-func-entry-exitEnable function entry/exit instrumentation in ThreadSanitizer (default)
-fsanitize-thread-memory-accessEnable memory access instrumentation in ThreadSanitizer (default)
-fsanitize-trap <command>Enable trapping for sanitizers
-fsanitize-undefined-strip-path-components <command>Strip (or keep only, if negative) a given number of path components when emitting check metadata
-fsanitize <command>Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks
-fsave-optimization-record [command]Generate an optimization record file in a specific format
-fseh-exceptionsUse SEH style exceptions
-fsemantic-interposition
-fshort-enumsAllocate to an enum type only as many bytes as it needs for the declared range of possible values
-fshort-wcharForce wchar_t to be a short unsigned int
-fshow-column
-fshow-overloads <command>Which overload candidates to show when overload resolution fails: best|all; defaults to all
-fsigned-charChar is signed
-fsigned-zeros
-fsized-deallocationEnable C++14 sized global deallocation functions
-fsjlj-exceptionsUse SjLj style exceptions
-fslp-vectorizeEnable the superword-level parallelism vectorization passes
-fsmall-block-descriptorsEnable small block descriptors
-fspell-checking
-fsplit-dwarf-inliningProvide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF
-fsplit-lto-unitEnables splitting of the LTO unit
-fsplit-machine-functionsEnable late function splitting using profile information (x86 ELF)
-fstack-checkEnable stack checking
-fstack-clash-protectionEnable stack clash protection
-fstack-protector-allEnable stack protectors for all functions
-fstack-protector-strongEnable 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
-fstack-protectorEnable 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
-fstack-size-sectionEmit section containing metadata on function stack sizes
-fstandalone-debugEmit full debug info for all types used by the program
-fstrict-enumsEnable optimizations based on the strict definition of an enum's value range
-fstrict-float-cast-overflowAssume that overflowing float-to-int casts are undefined (default)
-fstrict-return
-fstrict-vtable-pointersEnable optimizations based on the strict rules for overwriting polymorphic C++ objects
-fsyclEnable SYCL kernels compilation for device
-fsystem-moduleBuild this module as a system module. Only used with -emit-module
-ftarget-variant-availability-checksEnable availability checks for the target variant platform
-ftest-coverage
-fthin-link-bitcode <command>Write minimized bitcode to <file> for the ThinLTO thin link only
-fthinlto-index <command>Perform ThinLTO importing using provided function summary index
-fthreadsafe-statics
-ftime-report <command>(For new pass manager) "per-pass": one report for each pass; "per-pass-run": one report for each pass invocation
-ftime-trace-granularity <command>Minimum time granularity (in microseconds) traced by time profiler
-ftime-traceTurn on time profiler. Generates JSON file based on output filename
-ftrap-function <command>Issue call to specified function rather than a trap instruction
-ftrapv-handler <command>Specify the function to be called on overflow
-ftrapvTrap on integer overflow
-ftrigraphsProcess trigraph sequences
-ftrivial-auto-var-init-stop-after <command>Stop initializing trivial automatic stack variables after the specified number of instances
-ftrivial-auto-var-init <command>Initialize trivial automatic stack variables: uninitialized (default) | pattern
-funique-basic-block-section-namesUse unique names for basic block sections (ELF Only)
-funique-internal-linkage-namesUniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path
-funique-section-names
-funroll-loopsTurn on loop unroller
-fuse-cxa-atexit
-fuse-init-array
-fuse-line-directivesUse #line in preprocessed output
-fvalidate-ast-input-files-contentCompute 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
-fveclib <command>Use the given vector functions library
-fvectorizeEnable the loop vectorization passes
-fverbose-asmGenerate verbose assembly output
-fvirtual-function-eliminationEnables dead virtual function elimination optimization. Requires -flto=full
-fvisibility-dllexport <command>The visibility for dllexport definitions [-fvisibility-from-dllstorageclass]
-fvisibility-externs-dllimport <command>The visibility for dllimport external declarations [-fvisibility-from-dllstorageclass]
-fvisibility-externs-nodllstorageclass <command>The visibility for external declarations without an explicit DLL dllstorageclass [-fvisibility-from-dllstorageclass]
-fvisibility-from-dllstorageclassSet the visibility of symbols in the generated code from their DLL storage class
-fvisibility-global-new-delete-hiddenGive global C++ operator new and delete declarations hidden visibility
-fvisibility-inlines-hidden-static-local-varWhen -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default
-fvisibility-inlines-hiddenGive inline C++ member functions hidden visibility by default
-fvisibility-ms-compatGive global types 'default' visibility and global functions and variables 'hidden' visibility by default
-fvisibility-nodllstorageclass <command>The visibility for defintiions without an explicit DLL export class [-fvisibility-from-dllstorageclass]
-fvisibility <command>Set the default symbol visibility for all global declarations
-fwasm-exceptionsUse WebAssembly style exceptions
-fwhole-program-vtablesEnables whole-program vtable optimization. Requires -flto
-fwrapvTreat signed integer overflow as two's complement
-fwritable-stringsStore string literals as writable data
-fxray-always-emit-customeventsAlways emit __xray_customevent(...) calls even if the containing function is not always instrumented
-fxray-always-emit-typedeventsAlways emit __xray_typedevent(...) calls even if the containing function is not always instrumented
-fxray-always-instrument <command>DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute
-fxray-attr-list <command>Filename defining the list of functions/types for imbuing XRay attributes
-fxray-function-groups <command>Only instrument 1 of N groups
-fxray-function-index
-fxray-ignore-loopsDon't instrument functions with loops unless they also meet the minimum function size
-fxray-instruction-threshold <command>Sets the minimum function size to instrument with XRay
-fxray-instrumentation-bundle <command>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'
-fxray-instrumentGenerate XRay instrumentation sleds on function entry and exit
-fxray-link-depsTells clang to add the link dependencies for XRay
-fxray-modes <command>List of modes to link in by default into XRay instrumented binaries
-fxray-never-instrument <command>DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute
-fxray-selected-function-group <command>When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1
-fzero-initialized-in-bss
-fzvectorEnable System z vector language extension
-F <command>Add directory to framework include search path
--gcc-toolchain <command>Use the gcc toolchain at the given directory
-gcodeview-ghashEmit type record hashes in a .debug$H section
-gcodeviewGenerate CodeView debug information
-gcolumn-info
-gdwarf-2Generate source-level debug information with dwarf version 2
-gdwarf-3Generate source-level debug information with dwarf version 3
-gdwarf-4Generate source-level debug information with dwarf version 4
-gdwarf-5Generate source-level debug information with dwarf version 5
-gdwarfGenerate source-level debug information with the default dwarf version
-gembed-sourceEmbed source text in DWARF debug sections
-ginline-line-tables
-gline-directives-onlyEmit debug line info directives only
-gline-tables-onlyEmit debug line number tables only
-gmodulesGenerate debug info with external references to clang modules or precompiled headers
-gno-codeview-ghash
-gno-column-info
-gno-embed-sourceRestore the default behavior of not embedding source text in DWARF debug sections
-gno-inline-line-tablesDon't emit inline line tables
--gpu-instrument-lib <command>Instrument device library for HIP, which is a LLVM bitcode containing __cyg_profile_func_enter and __cyg_profile_func_exit
--gpu-max-threads-per-block <command>Default max threads per block for kernel launch bounds for HIP
-gsplit-dwarf <command>Set DWARF fission mode to either 'split' or 'single'
-gz <command>DWARF debug sections compression type
-G <command>Put objects of at most <size> bytes into small data section (MIPS / Hexagon)
-gGenerate source-level debug information
--help-hiddenDisplay help for hidden options
-helpDisplay available options
--hip-device-lib <command>HIP device library
--hip-linkLink clang-offload-bundler bundles for HIP
--hip-version <command>HIP version in the format of major.minor.patch
-HShow header includes and nesting depth
-I-Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path
-iapinotes-modules <command>Add directory to the API notes search path referenced by module name
-ibuiltinincEnable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it
-idirafter <command>Add directory to AFTER include search path
-iframeworkwithsysroot <command>Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot
-iframework <command>Add directory to SYSTEM framework search path
-imacros <command>Include macros from file before parsing
-include-pch <command>Include precompiled header file
-include <command>Include file before parsing
-index-header-mapMake the next included directory (-I or -F) an indexer header map
-index-ignore-macrosIgnore macros during indexing
-index-ignore-system-symbolsIgnore symbols from system headers
-index-record-codegen-nameRecord the codegen name for symbols
-index-store-path <command>Enable indexing with the specified data store path
-index-unit-output-path <command>Use <path> as the output path for this compilation unit in the index unit file
-iprefix <command>Set the -iwithprefix/-iwithprefixbefore prefix
-iquote <command>Add directory to QUOTE include search path
-isysroot <command>Set the system root directory (usually /)
-isystem-after <command>Add directory to end of the SYSTEM include search path
-isystem <command>Add directory to SYSTEM include search path
-ivfsoverlay <command>Overlay the virtual filesystem described by file over the real file system
-iwithprefixbefore <command>Set directory to include search path with prefix
-iwithprefix <command>Set directory to SYSTEM include search path with prefix
-iwithsysroot <command>Add directory to SYSTEM include search path, absolute paths are relative to -isysroot
-I <command>Add directory to include search path. 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
--libomptarget-nvptx-path <command>Path to libomptarget-nvptx libraries
-L <command>Add directory to library search path
-mabi <command>
-mabicallsEnable SVR4-style position-independent code (Mips only)
-maix-struct-returnReturn all structs in memory (PPC32 only)
-malign-branch-boundary <command>Specify the boundary's size to align branches
-malign-branch <command>Specify types of branches to align
-malign-doubleAlign doubles to two words in structs (x86 only)
-mbackchainLink stack frames through backchain on System Z
-mbranch-protection <command>Enforce targets of indirect branches and function returns
-mbranches-within-32B-boundariesAlign selected branches (fused, jcc, jmp) within 32-byte boundary
-mcmodel <command>
-mcmseAllow use of CMSE (Armv8-M Security Extensions)
-mcode-object-v3Legacy option to specify code object ABI V2 (-mnocode-object-v3) or V3 (-mcode-object-v3) (AMDGPU only)
-mcode-object-version <command>Specify code object ABI version. Defaults to 3. (AMDGPU only)
-mcrcAllow use of CRC instructions (ARM/Mips only)
-mcumodeSpecify CU (-mcumode) or WGP (-mno-cumode) wavefront execution mode (AMDGPU only)
-mdouble <command>Force double to be 32 bits or 64 bits
-MDWrite a depfile containing user and system headers
-meabi <command>Set EABI type, e.g. 4, 5 or gnu (default depends on triple)
-membedded-dataPlace constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS)
-menable-experimental-extensionsEnable use of experimental RISC-V extensions
-menable-unsafe-fp-mathAllow unsafe floating-point math optimizations which may decrease precision
-mexec-model <command>Execution model (WebAssembly only)
-mexecute-onlyDisallow generation of data access to code sections (ARM only)
-mextern-sdataAssume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
-mfentryInsert calls to fentry at function entry (x86/SystemZ only)
-mfix-cortex-a53-835769Workaround Cortex-A53 erratum 835769 (AArch64 only)
-mfp32Use 32-bit floating point registers (MIPS only)
-mfp64Use 64-bit floating point registers (MIPS only)
-MF <command>Write depfile output from -MMD, -MD, -MM, or -M to <file>
-mgeneral-regs-onlyGenerate code which only uses the general purpose registers (AArch64 only)
-mglobal-mergeEnable merging of globals
-mgpoptUse GP relative accesses for symbols known to be in a small data section (MIPS)
-MGAdd missing headers to depfile
-mharden-sls <command>Select straight-line speculation hardening scope
-mhvx-length <command>Set Hexagon Vector Length
-mhvx [command]Enable Hexagon Vector eXtensions
-miamcuUse Intel MCU ABI
-mignore-xcoff-visibilityNot emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file
--migrateRun the migrator
-mincremental-linker-compatible(integrated-as) Emit an object file which can be used with an incremental linker
-mindirect-jump <command>Change indirect jump instructions to inhibit speculation
-mios-version-min <command>Set iOS deployment target
-MJ <command>Write a compilation database entry per input
-mllvm <command>Additional arguments to forward to LLVM's option processing
-mlocal-sdataExtend the -G behaviour to object local data (MIPS)
-mlong-callsGenerate branches with extended addressability, usually via indirect jumps
-mlong-double-128Force long double to be 128 bits
-mlong-double-64Force long double to be 64 bits
-mlong-double-80Force long double to be 80 bits, padded to 128 bits for storage
-mlvi-cfiEnable only control-flow mitigations for Load Value Injection (LVI)
-mlvi-hardeningEnable all mitigations for Load Value Injection (LVI)
-mmacosx-version-min <command>Set Mac OS X deployment target
-mmadd4Enable the generation of 4-operand madd.s, madd.d and related instructions
-mmark-bti-propertyAdd .note.gnu.property with BTI to assembly files (AArch64 only)
-MMDWrite a depfile containing user headers
-mmemopsEnable generation of memop instructions
-mms-bitfieldsSet the default structure layout to be compatible with the Microsoft compiler standard
-mmsaEnable MSA ASE (MIPS only)
-mmtEnable MT ASE (MIPS only)
-MMLike -MMD, but also implies -E and writes to stdout by default
-mno-abicallsDisable SVR4-style position-independent code (Mips only)
-mno-backchain
-mno-crcDisallow use of CRC instructions (Mips only)
-mno-embedded-dataDo not place constants in the .rodata section instead of the .sdata if they meet the -G <size> threshold (MIPS)
-mno-execute-onlyAllow generation of data access to code sections (ARM only)
-mno-extern-sdataDo not assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
-mno-fix-cortex-a53-835769Don't workaround Cortex-A53 erratum 835769 (AArch64 only)
-mno-global-mergeDisable merging of globals
-mno-gpoptDo not use GP relative accesses for symbols known to be in a small data section (MIPS)
-mno-hvxDisable Hexagon Vector eXtensions
-mno-implicit-floatDon't generate implicit floating point instructions
-mno-incremental-linker-compatible(integrated-as) Emit an object file which cannot be used with an incremental linker
-mno-local-sdataDo not extend the -G behaviour to object local data (MIPS)
-mno-long-callsRestore the default behaviour of not generating long calls
-mno-lvi-cfiDisable control-flow mitigations for Load Value Injection (LVI)
-mno-lvi-hardeningDisable mitigations for Load Value Injection (LVI)
-mno-madd4Disable the generation of 4-operand madd.s, madd.d and related instructions
-mno-memopsDisable generation of memop instructions
-mno-movtDisallow use of movt/movw pairs (ARM only)
-mno-ms-bitfieldsDo not set the default structure layout to be compatible with the Microsoft compiler standard
-mno-msaDisable MSA ASE (MIPS only)
-mno-mtDisable MT ASE (MIPS only)
-mno-neg-immediatesDisallow converting instructions with negative immediates to their negation or inversion
-mno-nvjDisable generation of new-value jumps
-mno-nvsDisable generation of new-value stores
-mno-outline-atomicsDon't generate local calls to out-of-line atomic operations
-mno-outlineDisable function outlining (AArch64 only)
-mno-packetsDisable generation of instruction packets
-mno-pie-copy-relocations
-mno-relaxDisable linker relaxation
-mno-restrict-itAllow generation of deprecated IT blocks for ARMv8. It is off by default for ARMv8 Thumb mode
-mno-save-restoreDisable using library calls for save and restore
-mno-sesesDisable speculative execution side effect suppression (SESES)
-mno-speculative-load-hardening
-mno-stack-arg-probeDisable stack probes which are enabled by default
-mno-tls-direct-seg-refsDisable direct TLS access through segment registers
-mno-unaligned-accessForce all memory accesses to be aligned (AArch32/AArch64 only)
-mno-wavefrontsize64Specify wavefront size 32 mode (AMDGPU only)
-mnocrcDisallow use of CRC instructions (ARM only)
-mnop-mcountGenerate mcount/__fentry__ calls as nops. To activate they need to be patched in
-mnvjEnable generation of new-value jumps
-mnvsEnable generation of new-value stores
-module-dependency-dir <command>Directory to dump module dependencies to
-module-file-infoProvide information about a particular module file
-momit-leaf-frame-pointerOmit frame pointer setup for leaf functions
-moutline-atomicsGenerate local calls to out-of-line atomic operations
-moutlineEnable function outlining (AArch64 only)
-mpacked-stackUse packed stack layout (SystemZ only)
-mpacketsEnable generation of instruction packets
-mpad-max-prefix-size <command>Specify maximum number of prefixes to use for padding
-mpie-copy-relocationsUse copy relocations support for PIE builds
-mprefer-vector-width <command>Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions
-MPCreate phony target for each dependency (other than main file)
-mqdsp6-compatEnable hexagon-qdsp6 backward compatibility
-MQ <command>Specify name of main file output to quote in depfile
-mrecord-mcountGenerate a __mcount_loc section entry for each __fentry__ call
-mrelax-all(integrated-as) Relax all machine instructions
-mrelaxEnable linker relaxation
-mrestrict-itDisallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode
-mrtdMake StdCall calling convention the default
-msave-restoreEnable using library calls for save and restore
-msesesEnable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations
-msign-return-address <command>Select return address signing scope
-msmall-data-limit <command>Put global and static data smaller than the limit into a special section
-msoft-floatUse software floating point
-mspeculative-load-hardening
-mstack-alignment <command>Set the stack alignment
-mstack-arg-probeEnable stack probes
-mstack-probe-size <command>Set the stack probe size
-mstack-protector-guard-offset <command>Use the given offset for addressing the stack-protector guard
-mstack-protector-guard-reg <command>Use the given reg for addressing the stack-protector guard
-mstack-protector-guard <command>Use the given guard (global, tls) for addressing the stack-protector guard
-mstackrealignForce realign the stack at entry to every function
-msve-vector-bits <command>Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only)
-msvr4-struct-returnReturn small structs in registers (PPC32 only)
-mthread-model <command>The thread model to use, e.g. posix, single (posix by default)
-mtls-direct-seg-refsEnable direct TLS access through segment registers (default)
-mtls-size <command>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)
-mtp <command>Thread pointer access method (AArch32/AArch64 only)
-mtune <command>Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC
-MT <command>Specify name of main file output in depfile
-munaligned-accessAllow memory accesses to be unaligned (AArch32/AArch64 only)
-munsafe-fp-atomicsEnable unsafe floating point atomic instructions (AMDGPU only)
-MVUse NMake/Jom format for the depfile
-mwavefrontsize64Specify wavefront size 64 mode (AMDGPU only)
-MLike -MD, but also implies -E and writes to stdout by default
--no-cuda-include-ptx <command>Do not include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once
--no-cuda-version-checkDon't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture
--no-offload-arch <command>Remove CUDA/HIP offloading device architecture (e.g. sm_35, gfx906) from the list of devices to compile for. 'all' resets the list to its default value
-no-pthread
--no-system-header-prefix <command>Treat all #include paths starting with <prefix> as not including a system header
-nobuiltinincDisable builtin #include directories
-nogpuincDo not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers
-nogpulibDo not link device library for CUDA/HIP device compilation
-nostdinc++Disable standard #include directories for the C++ standard library
-ObjC++Treat source input files as Objective-C++ inputs
-objcmt-atomic-propertyMake migration to 'atomic' properties
-objcmt-migrate-allEnable migration to modern ObjC
-objcmt-migrate-annotationEnable migration to property and method annotations
-objcmt-migrate-designated-initEnable migration to infer NS_DESIGNATED_INITIALIZER for initializer methods
-objcmt-migrate-instancetypeEnable migration to infer instancetype for method result type
-objcmt-migrate-literalsEnable migration to modern ObjC literals
-objcmt-migrate-ns-macrosEnable migration to NS_ENUM/NS_OPTIONS macros
-objcmt-migrate-property-dot-syntaxEnable migration of setter/getter messages to property-dot syntax
-objcmt-migrate-propertyEnable migration to modern ObjC property
-objcmt-migrate-protocol-conformanceEnable migration to add protocol conformance on classes
-objcmt-migrate-readonly-propertyEnable migration to modern ObjC readonly property
-objcmt-migrate-readwrite-propertyEnable migration to modern ObjC readwrite property
-objcmt-migrate-subscriptingEnable migration to modern ObjC subscripting
-objcmt-ns-nonatomic-iosonlyEnable migration to use NS_NONATOMIC_IOSONLY macro for setting property's 'atomic' attribute
-objcmt-returns-innerpointer-propertyEnable migration to annotate property with NS_RETURNS_INNER_POINTER
-objcmt-whitelist-dir-path <command>Only modify files with a filename contained in the provided directory path
-ObjCTreat source input files as Objective-C inputs
--offload-arch <command>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
-o <command>Write output to <file>
-pgEnable mcount instrumentation
-pipeUse pipes between commands, when possible
--precompileOnly precompile the input
-print-effective-triplePrint the effective target triple
-print-file-name <command>Print the full library path of <file>
-print-ivar-layoutEnable Objective-C Ivar layout bitmap print trace
-print-libgcc-file-namePrint the library path for the currently used compiler runtime library ("libgcc.a" or "libclang_rt.builtins.*.a")
-print-prog-name <command>Print the full program path of <name>
-print-resource-dirPrint the resource directory pathname
-print-search-dirsPrint the paths used for finding libraries and programs
-print-supported-cpusPrint supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target)
-print-target-triplePrint the normalized target triple
-print-targetsPrint the registered targets
-pthreadSupport POSIX threads in generated code
--ptxas-path <command>Path to ptxas (used for compiling CUDA code)
-PDisable linemarker output in -E mode
-QnDo not emit metadata containing compiler name and version
-Qunused-argumentsDon't emit warning for unused driver arguments
-QyEmit metadata containing compiler name and version
-relocatable-pchWhether to build a relocatable precompiled header
-rewrite-legacy-objcRewrite Legacy Objective-C source to C++
-rewrite-objcRewrite Objective-C source to C++
--rocm-device-lib-path <command>ROCm device library path. Alternative to rocm-path
--rocm-path <command>ROCm installation path, used for finding and automatically linking required bitcode libraries
-Rpass-analysis <command>Report transformation analysis from optimization passes whose name matches the given POSIX regular expression
-Rpass-missed <command>Report missed transformations by optimization passes whose name matches the given POSIX regular expression
-Rpass <command>Report transformations performed by optimization passes whose name matches the given POSIX regular expression
-rtlib <command>Compiler runtime library to use
-Rremark <arg>Enable the specified remark
-save-stats [command]Save llvm statistics
-save-temps [command]Save intermediate compilation results
-serialize-diagnostics <command>Serialize compiler diagnostics to a file
-shared-libsanDynamically link the sanitizer runtime
-static-libsanStatically link the sanitizer runtime
-static-openmpUse the static host OpenMP runtime while linking
-std <command>Language standard to compile for
-stdlib++-isystem <command>Use directory as the C++ standard library include path
-stdlib <command>C++ standard library to use
-sycl-std <command>SYCL language standard to compile for
--system-header-prefix <command>Treat all #include paths starting with <prefix> as including a system header
-SOnly run preprocess and compilation steps
-target-variant <command>Generate code that may run on a particular variant of the deployment target
--target <command>Generate code for the given target
-Tbss <command>Set starting address of BSS to <addr>
-Tdata <command>Set starting address of DATA to <addr>
-timeTime individual commands
-traditional-cppEnable some traditional CPP emulation
-trigraphsProcess trigraph sequences
-Ttext <command>Set starting address of TEXT to <addr>
-T <command>Specify <script> as linker script
-undefUndef all system defines
-unwindlib <command>Unwind library to use
-U <command>Undefine macro <macro>
--verify-debug-infoVerify the binary representation of debug output
-verify-pchLoad and verify that a pre-compiled header file is not stale
--versionPrint version information
-vShow commands to run and use verbose output
-Wa,arg <arg>Pass the comma separated arguments in <arg> to the assembler
-WdeprecatedEnable warnings for deprecated constructs and define __DEPRECATED
-Wl,arg <arg>Pass the comma separated arguments in <arg> to the linker
-working-directory <command>Resolve file paths relative to the specified directory
-Wp,arg <arg>Pass the comma separated arguments in <arg> to the preprocessor
-Wwarning <arg>Enable the specified warning
-wSuppress all warnings
-Xanalyzer <command>Pass <arg> to the static analyzer
-Xarch_device <command>Pass <arg> to the CUDA/HIP device compilation
-Xarch_host <command>Pass <arg> to the CUDA/HIP host compilation
-Xassembler <command>Pass <arg> to the assembler
-Xclang <command>Pass <arg> to the clang compiler
-Xcuda-fatbinary <command>Pass <arg> to fatbinary invocation
-Xcuda-ptxas <command>Pass <arg> to the ptxas assembler
-Xlinker <command>Pass <arg> to the linker
-Xopenmp-target [command] <command>Pass <arg> to the target offloading toolchain identified by <triple>
-Xpreprocessor <command>Pass <arg> to the preprocessor
-x <command>Treat subsequent input files as having type <language>
-z <command>Pass -z <arg> to the linker