Provided by: castxml_0.6.3-1build2_amd64 
NAME
castxml - Create an XML representation of C++ declarations
SYNOPSIS
castxml ( <castxml-opt> | <clang-opt> | <src> )...
DESCRIPTION
Options interpreted by castxml are listed below. Remaining options are given to the internal
Clang compiler.
OPTIONS
--castxml-cc-<id> <cc>
--castxml-cc-<id> "(" <cc> <cc-opt>... ")"
Configure the internal Clang preprocessor and target platform to match that of the given compiler
command. The <id> must be "gnu", "msvc", "gnu-c", or "msvc-c". <cc> names a compiler (e.g.
"gcc") and <cc-opt>... specifies options that may affect its target (e.g. "-m32").
--castxml-output=<v>
Write castxml-format output to <src>.xml or file named by '-o' The <v> specifies the "epic" format
version number to generate, and must be '1'.
--castxml-gccxml
Write gccxml-format output to <src>.xml or file named by '-o' Use this option if you need an
output similar to the one generated by the legacy gccxml tool.
--castxml-start <name>[,<name>]...
Start AST traversal at declaration(s) with the given (qualified) name(s). Multiple names may be
specified as a comma-separated list or by repeating the option.
-help, --help
Print castxml and internal Clang compiler usage information
-o <file>
Write output to <file>
--version
Print castxml and internal Clang compiler version information
Help for the internal Clang compiler appears below.
---------------------------------------------------------------
OVERVIEW: clang LLVM compiler
USAGE: clang [options] file...
OPTIONS:
-### Print (but do not run) the commands to run for this compilation
--amdgpu-arch-tool=<value>
Tool used for detecting AMD GPU arch in the system.
--analyzer-output <value>
Static analyzer report output format
(html|plist|plist-multi-file|plist-html|sarif|sarif-html|text).
--analyze
Run the static analyzer
-arcmt-migrate-emit-errors
Emit ARC errors even if the migrator can fix them
-arcmt-migrate-report-output <value>
Output path for the plist report
-B <prefix>
Search $prefix$file for executables, libraries, and data files. If $prefix is a directory, search
$prefix/$file
-b <arg>
Pass -b <arg> to the linker on AIX
-CC Include comments from within macros in preprocessed output
-cl-denorms-are-zero
OpenCL only. Allow denormals to be flushed to zero.
-cl-ext=<value>
OpenCL only. Enable or disable OpenCL extensions/optional features. The argument is a
comma-separated sequence of one or more extension names, each prefixed by '+' or '-'.
-cl-fast-relaxed-math
OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines
__FAST_RELAXED_MATH__.
-cl-finite-math-only
OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or
+-Inf.
-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.
-cl-kernel-arg-info
OpenCL only. Generate kernel argument metadata.
-cl-mad-enable
OpenCL only. Allow use of less precise MAD computations in the generated binary.
-cl-no-signed-zeros
OpenCL only. Allow use of less precise no signed zeros computations in the generated binary.
-cl-no-stdinc
OpenCL only. Disables all standard includes containing non-native compiler types and functions.
-cl-opt-disable
OpenCL only. This option disables all optimizations. By default optimizations are enabled.
-cl-single-precision-constant
OpenCL only. Treat double precision floating-point constant as single precision constant.
-cl-std=<value>
OpenCL language standard to compile for.
-cl-strict-aliasing
OpenCL only. This option is added for compatibility with OpenCL 1.0.
-cl-uniform-work-group-size
OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to
clEnqueueNDRangeKernel
-cl-unsafe-math-optimizations
OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and
-cl-mad-enable.
--config=<file>
Specify configuration file
--cuda-compile-host-device
Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations.
--cuda-device-only
Compile CUDA code for device only
--cuda-feature=<value>
Manually specify the CUDA feature to use
--cuda-host-only
Compile CUDA code for host only. Has no effect on non-CUDA compilations.
--cuda-include-ptx=<value>
Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than
once.
--cuda-noopt-device-debug
Enable device-side debug info generation. Disables ptxas optimizations.
--cuda-path-ignore-env
Ignore environment variables to detect CUDA installation
--cuda-path=<value>
CUDA installation path
-cuid=<value>
An ID for compilation unit, which should be the same for the same compilation unit but different
for different compilation units. It is used to externalize device-side static variables for single
source offloading languages CUDA and HIP so that they can be accessed by the host code of the same
compilation unit.
-cxx-isystem <directory>
Add directory to the C++ SYSTEM include search path
-C Include comments in preprocessed output
-c Only run preprocess, compile, and assemble steps
-darwin-target-variant-triple <value>
Specify the darwin target variant triple
-darwin-target-variant <value>
Generate code for an additional runtime variant of the deployment target
-dD Print macro definitions in -E mode in addition to normal output
-dependency-dot <value> Filename to write DOT-formatted header dependencies to
-dependency-file <value>
Filename (or -) to write dependency output to
-dI Print include directives in -E mode in addition to normal output
-dM Print macro definitions in -E mode instead of normal output
-dsym-dir <dir>
Directory to output dSYM's (if any) to
-dumpdir <dumppfx>
Use <dumpfpx> as a prefix to form auxiliary and dump file names
-D <macro>=<value>
Define <macro> to <value> (or 1 if <value> omitted)
-emit-ast
Emit Clang AST files for source inputs
-emit-interface-stubs
Generate Interface Stub Files.
-emit-llvm
Use the LLVM representation for assembler and object files
-emit-merged-ifs
Generate Interface Stub Files, emit merged text not binary.
--emit-static-lib
Enable linker job to emit a static library.
--emit-symbol-graph= <value>
Generate Extract API information as a side effect of compilation.
--end-no-unused-arguments
Start emitting warnings for unused driver arguments
--extract-api-ignores=<value>
Comma separated list of files containing a new line separated list of API symbols to ignore when
extracting API information.
-extract-api
Extract API information
-E Only run the preprocessor
-faapcs-bitfield-load
Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM
only).
-faapcs-bitfield-width
Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the
field container type. (ARM only).
-faddrsig
Emit an address-significance table
-falign-loops=<N>
N must be a power of two. Align loops to the boundary
-faligned-allocation
Enable C++17 aligned allocation functions
-fallow-editor-placeholders
Treat editor placeholders as valid source code
-faltivec-src-compat=<value>
Source-level compatibility for Altivec vectors (for PowerPC targets). This includes results of
vector comparison (scalar for 'xl', vector for 'gcc') as well as behavior when initializing with a
scalar (splatting for 'xl', element zero only for 'gcc'). For 'mixed', the compatibility is as
'gcc' for 'vector bool/vector pixel' and as 'xl' for other types. Current default is 'mixed'.
-fansi-escape-codes
Use ANSI escape codes for diagnostics
-fapple-kext
Use Apple's kernel extensions ABI
-fapple-link-rtlib
Force linking the clang builtins runtime library
-fapple-pragma-pack
Enable Apple gcc-compatible #pragma pack handling
-fapplication-extension Restrict code to those available for App Extensions
-fapprox-func
Allow certain math function calls to be replaced with an approximately equivalent calculation
-fasync-exceptions
Enable EH Asynchronous exceptions
-fbasic-block-sections=<value>
Place each function's basic blocks in unique sections (ELF Only)
-fbinutils-version=<major.minor>
Produced object files can use all ELF features supported by this binutils version and newer. If
-fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means
that all ELF features can be used, regardless of binutils support. Defaults to 2.26.
-fblocks
Enable the 'blocks' language feature
-fborland-extensions
Accept non-standard constructs supported by the Borland compiler
-fbuild-session-file=<file>
Use the last modification time of <file> as the build session timestamp
-fbuild-session-timestamp=<time since Epoch in seconds>
Time when the current build session started
-fbuiltin-module-map
Load the clang builtins module map file.
-fc++-abi=<value>
C++ ABI to use. This will override the target C++ ABI.
-fcall-saved-x10
Make the x10 register call-saved (AArch64 only)
-fcall-saved-x11
Make the x11 register call-saved (AArch64 only)
-fcall-saved-x12
Make the x12 register call-saved (AArch64 only)
-fcall-saved-x13
Make the x13 register call-saved (AArch64 only)
-fcall-saved-x14
Make the x14 register call-saved (AArch64 only)
-fcall-saved-x15
Make the x15 register call-saved (AArch64 only)
-fcall-saved-x18
Make the x18 register call-saved (AArch64 only)
-fcall-saved-x8
Make the x8 register call-saved (AArch64 only)
-fcall-saved-x9
Make the x9 register call-saved (AArch64 only)
-fcaret-diagnostics-max-lines=<value>
Set the maximum number of source lines to show in a caret diagnostic (0 = no limit).
-fcf-protection=<value> Instrument control-flow architecture protection
-fcf-protection
Enable cf-protection in 'full' mode
-fchar8_t
Enable C++ builtin type char8_t
-fcheck-new
Do not assume C++ operator new may not return NULL
-fclang-abi-compat=<version>
Attempt to match the ABI of Clang <version>
-fcolor-diagnostics
Enable colors in diagnostics
-fcomment-block-commands=<arg>
Treat each comma separated argument in <arg> as a documentation comment block command
-fcommon
Place uninitialized global variables in a common block
-fcomplete-member-pointers
Require member pointer base types to be complete if they would be significant under the Microsoft
ABI
-fconstexpr-backtrace-limit=<value>
Set the maximum number of entries to print in a constexpr evaluation backtrace (0 = no limit)
-fconstexpr-depth=<value>
Set the maximum depth of recursive constexpr function calls
-fconstexpr-steps=<value>
Set the maximum number of steps in constexpr function evaluation
-fcoro-aligned-allocation
Prefer aligned allocation for C++ Coroutines
-fcoroutines
Enable support for the C++ Coroutines
-fcoverage-compilation-dir=<value>
The compilation directory to embed in the coverage mapping.
-fcoverage-mapping
Generate coverage mapping to enable code coverage analysis
-fcoverage-prefix-map=<old>=<new>
remap file source paths <old> to <new> in coverage mapping. If there are multiple options, prefix
replacement is applied in reverse order starting from the last one
-fcrash-diagnostics-dir=<dir>
Put crash-report files in <dir>
-fcrash-diagnostics=<value>
Set level of crash diagnostic reporting, (option: off, compiler, all)
-fcrash-diagnostics
Enable crash diagnostic reporting (default)
-fcs-profile-generate=<directory>
Generate instrumented code to collect context sensitive execution counts into
<directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fcs-profile-generate
Generate instrumented code to collect context sensitive execution counts into default.profraw
(overridden by LLVM_PROFILE_FILE env var)
-fcuda-approx-transcendentals
Use approximate transcendental functions
-fcuda-short-ptr
Use 32-bit pointers for accessing const/local/shared address spaces
-fcxx-exceptions
Enable C++ exceptions
-fcxx-modules
Enable modules for C++
-fdata-sections
Place each data in its own section
-fdebug-compilation-dir=<value>
The compilation directory to embed in the debug info
-fdebug-default-version=<value>
Default DWARF version to use, if a -g option caused DWARF debug info to be produced
-fdebug-info-for-profiling
Emit extra debug info to make sample profile more accurate
-fdebug-macro
Emit macro debug information
-fdebug-prefix-map=<old>=<new>
For paths in debug info, remap directory <old> to <new>. If multiple options match a path, the
last option wins
-fdebug-ranges-base-address
Use DWARF base address selection entries in .debug_ranges
-fdebug-types-section
Place debug types in their own section (ELF Only)
-fdeclspec
Allow __declspec as a keyword
-fdelayed-template-parsing
Parse templated function definitions at the end of the translation unit
-fdelete-null-pointer-checks
Treat usage of null pointers as undefined behavior (default)
-fdiagnostics-absolute-paths
Print absolute paths in diagnostics
-fdiagnostics-hotness-threshold=<value>
Prevent optimization remarks from being output if they do not have at least this profile count.
Use 'auto' to apply the threshold from profile summary
-fdiagnostics-misexpect-tolerance=<value>
Prevent misexpect diagnostics from being output if the profile counts are within N% of the
expected.
-fdiagnostics-parseable-fixits
Print fix-its in machine parseable form
-fdiagnostics-print-source-range-info
Print source range spans in numeric form
-fdiagnostics-show-hotness
Enable profile hotness information in diagnostic line
-fdiagnostics-show-note-include-stack
Display include stacks for diagnostic notes
-fdiagnostics-show-option
Print option name with mappable diagnostics
-fdiagnostics-show-template-tree
Print a template comparison tree for differing templates
-fdigraphs
Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default)
-fdirect-access-external-data
Don't use GOT indirection to reference external data symbols
-fdiscard-value-names
Discard value names in LLVM IR
-fdollars-in-identifiers
Allow '$' in identifiers
-fdriver-only
Only run the driver.
-fdwarf-exceptions
Use DWARF style exceptions
-feliminate-unused-debug-types
Do not emit debug info for defined but unused types
-fembed-bitcode-marker
Embed placeholder LLVM IR data as a marker
-fembed-bitcode=<option>
Embed LLVM bitcode
-fembed-bitcode
Embed LLVM IR bitcode as data
-fembed-offload-object=<value>
Embed Offloading device-side binary into host object file as a section.
-femit-all-decls
Emit all declarations, even if unused
-femit-compact-unwind-non-canonical
Try emitting Compact-Unwind for non-canonical entries. Maybe overriden by other constraints
-femit-dwarf-unwind=<value>
When to emit DWARF unwind (EH frame) info
-femulated-tls
Use emutls functions to access thread_local variables
-fenable-matrix
Enable matrix data type and related builtin functions
-fexceptions
Enable support for exception handling
-fexcess-precision=<value>
Allows control over excess precision on targets where native support for the precision types is
not available. By default, excess precision is used to calculate intermediate results following
the rules specified in ISO C99.
-fexperimental-library
Control whether unstable and experimental library features are enabled. This option enables
various library features that are either experimental (also known as TSes), or have been but are
not stable yet in the selected Standard Library implementation. It is not recommended to use this
option in production code, since neither ABI nor API stability are guaranteed. This is intended to
provide a preview of features that will ship in the future for experimentation purposes
-fexperimental-new-constant-interpreter
Enable the experimental new constant interpreter
-fexperimental-relative-c++-abi-vtables
Use the experimental C++ class ABI for classes with virtual tables
-fexperimental-sanitize-metadata-ignorelist=<value>
Disable sanitizer metadata for modules and functions that match the provided special case list
-fexperimental-sanitize-metadata=<value>
Specify the type of metadata to emit for binary analysis sanitizers
-fexperimental-strict-floating-point
Enables the use of non-default rounding modes and non-default exception handling on targets that
are not currently ready.
-fextend-arguments=<value>
Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions
-ffast-math
Allow aggressive, lossy floating-point optimizations
-ffile-compilation-dir=<value>
The compilation directory to embed in the debug info and coverage mapping.
-ffile-prefix-map=<value>
remap file source paths in debug info, predefined preprocessor macros and __builtin_FILE().
Implies -ffile-reproducible.
-ffile-reproducible
Use the target's platform-specific path separator character when expanding the __FILE__ macro
-ffine-grained-bitfield-accesses
Use separate accesses for consecutive bitfield runs with legal widths and alignments.
-ffinite-loops
Assume all loops are finite.
-ffinite-math-only
Allow floating-point optimizations that assume arguments and results are not NaNs or +-inf. This
defines the \_\_FINITE\_MATH\_ONLY\_\_ preprocessor macro.
-ffixed-a0
Reserve the a0 register (M68k only)
-ffixed-a1
Reserve the a1 register (M68k only)
-ffixed-a2
Reserve the a2 register (M68k only)
-ffixed-a3
Reserve the a3 register (M68k only)
-ffixed-a4
Reserve the a4 register (M68k only)
-ffixed-a5
Reserve the a5 register (M68k only)
-ffixed-a6
Reserve the a6 register (M68k only)
-ffixed-d0
Reserve the d0 register (M68k only)
-ffixed-d1
Reserve the d1 register (M68k only)
-ffixed-d2
Reserve the d2 register (M68k only)
-ffixed-d3
Reserve the d3 register (M68k only)
-ffixed-d4
Reserve the d4 register (M68k only)
-ffixed-d5
Reserve the d5 register (M68k only)
-ffixed-d6
Reserve the d6 register (M68k only)
-ffixed-d7
Reserve the d7 register (M68k only)
-ffixed-point
Enable fixed point types
-ffixed-r19
Reserve register r19 (Hexagon only)
-ffixed-r9
Reserve the r9 register (ARM only)
-ffixed-x10
Reserve the x10 register (AArch64/RISC-V only)
-ffixed-x11
Reserve the x11 register (AArch64/RISC-V only)
-ffixed-x12
Reserve the x12 register (AArch64/RISC-V only)
-ffixed-x13
Reserve the x13 register (AArch64/RISC-V only)
-ffixed-x14
Reserve the x14 register (AArch64/RISC-V only)
-ffixed-x15
Reserve the x15 register (AArch64/RISC-V only)
-ffixed-x16
Reserve the x16 register (AArch64/RISC-V only)
-ffixed-x17
Reserve the x17 register (AArch64/RISC-V only)
-ffixed-x18
Reserve the x18 register (AArch64/RISC-V only)
-ffixed-x19
Reserve the x19 register (AArch64/RISC-V only)
-ffixed-x1
Reserve the x1 register (AArch64/RISC-V only)
-ffixed-x20
Reserve the x20 register (AArch64/RISC-V only)
-ffixed-x21
Reserve the x21 register (AArch64/RISC-V only)
-ffixed-x22
Reserve the x22 register (AArch64/RISC-V only)
-ffixed-x23
Reserve the x23 register (AArch64/RISC-V only)
-ffixed-x24
Reserve the x24 register (AArch64/RISC-V only)
-ffixed-x25
Reserve the x25 register (AArch64/RISC-V only)
-ffixed-x26
Reserve the x26 register (AArch64/RISC-V only)
-ffixed-x27
Reserve the x27 register (AArch64/RISC-V only)
-ffixed-x28
Reserve the x28 register (AArch64/RISC-V only)
-ffixed-x29
Reserve the x29 register (AArch64/RISC-V only)
-ffixed-x2
Reserve the x2 register (AArch64/RISC-V only)
-ffixed-x30
Reserve the x30 register (AArch64/RISC-V only)
-ffixed-x31
Reserve the x31 register (AArch64/RISC-V only)
-ffixed-x3
Reserve the x3 register (AArch64/RISC-V only)
-ffixed-x4
Reserve the x4 register (AArch64/RISC-V only)
-ffixed-x5
Reserve the x5 register (AArch64/RISC-V only)
-ffixed-x6
Reserve the x6 register (AArch64/RISC-V only)
-ffixed-x7
Reserve the x7 register (AArch64/RISC-V only)
-ffixed-x8
Reserve the x8 register (AArch64/RISC-V only)
-ffixed-x9
Reserve the x9 register (AArch64/RISC-V only)
-fforce-dwarf-frame
Always emit a debug frame section
-fforce-emit-vtables
Emits more virtual tables to improve devirtualization
-fforce-enable-int128
Enable support for int128_t type
-ffp-contract=<value>
Form fused FP ops (e.g. FMAs)
-ffp-eval-method=<value>
Specifies the evaluation method to use for floating-point arithmetic.
-ffp-exception-behavior=<value>
Specifies the exception behavior of floating-point operations.
-ffp-model=<value>
Controls the semantics of floating-point calculations.
-ffreestanding
Assert that the compilation takes place in a freestanding environment
-ffuchsia-api-level=<value>
Set Fuchsia API level
-ffunction-sections
Place each function in its own section
-fglobal-isel
Enables the global instruction selector
-fgnu-keywords
Allow GNU-extension keywords regardless of language standard
-fgnu-runtime
Generate output compatible with the standard GNU Objective-C runtime
-fgnu89-inline
Use the gnu89 inline semantics
-fgnuc-version=<value>
Sets various macros to claim compatibility with the given GCC version (default is 4.2.1)
-fgpu-allow-device-init Allow device side init function in HIP (experimental)
-fgpu-default-stream=<value>
Specify default stream. The default value is 'legacy'. (HIP only)
-fgpu-defer-diag
Defer host/device related diagnostic messages for CUDA/HIP
-fgpu-flush-denormals-to-zero
Flush denormal floating point values to zero in CUDA/HIP device mode.
-fgpu-rdc
Generate relocatable device code, also known as separate compilation mode
-fgpu-sanitize
Enable sanitizer for AMDGPU target
-fhip-emit-relocatable
Compile HIP source to relocatable
-fhip-fp32-correctly-rounded-divide-sqrt
Specify that single precision floating-point divide and sqrt used in the program source are
correctly rounded (HIP device compilation only)
-fhip-kernel-arg-name
Specify that kernel argument names are preserved (HIP only)
-fhip-new-launch-api
Use new kernel launching API for HIP
-fhonor-infinities
Specify that floating-point optimizations are not allowed that assume arguments and results are
not +-inf.
-fhonor-nans
Specify that floating-point optimizations are not allowed that assume arguments and results are
not NANs.
-fignore-exceptions
Enable support for ignoring exception handling constructs
-fimplicit-module-maps
Implicitly search the file system for module map files.
-fincremental-extensions
Enable incremental processing extensions such as processingstatements on the global scope.
-finline-functions
Inline suitable functions
-finline-hint-functions Inline functions which are (explicitly or implicitly) marked inline
-finline-max-stacksize=<value>
Suppress inlining of functions whose stack size exceeds the given value
-finput-charset=<value> Specify the default character set for source files
-finstrument-function-entry-bare
Instrument function entry only, after inlining, without arguments to the instrumentation call
-finstrument-functions-after-inlining
Like -finstrument-functions, but insert the calls after inlining
-finstrument-functions
Generate calls to instrument function entry and exit
-fintegrated-as
Enable the integrated assembler
-fintegrated-cc1
Run cc1 in-process
-fintegrated-objemitter Use internal machine object code emitter.
-fjmc Enable just-my-code debugging
-fjump-tables
Use jump tables for lowering switches
-fkeep-persistent-storage-variables
Enable keeping all variables that have a persistent storage duration, including global, static and
thread-local variables, to guarantee that they can be directly addressed
-fkeep-static-consts
Keep static const variables even if unused
-flax-vector-conversions=<value>
Enable implicit vector bit-casts
-flto-jobs=<value>
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=auto
Enable LTO in 'full' mode
-flto=jobserver
Enable LTO in 'full' mode
-flto=<value>
Set LTO mode
-flto Enable LTO in 'full' mode
-fmacro-backtrace-limit=<value>
Set the maximum number of entries to print in a macro expansion backtrace (0 = no limit)
-fmacro-prefix-map=<value>
remap file source paths in predefined preprocessor macros and __builtin_FILE(). Implies
-ffile-reproducible.
-fmath-errno
Require math functions to indicate errors by setting errno
-fmax-tokens=<value>
Max total number of preprocessed tokens for -Wmax-tokens.
-fmax-type-align=<value>
Specify the maximum alignment to enforce on pointers lacking an explicit alignment
-fmemory-profile-use=<pathname>
Use memory profile for profile-guided memory optimization
-fmemory-profile=<directory>
Enable heap memory profiling and dump results into <directory>
-fmemory-profile
Enable heap memory profiling
-fmerge-all-constants
Allow merging of constants
-fmessage-length=<value>
Format message diagnostics so that they fit within N columns
-fminimize-whitespace
Ignore the whitespace from the input file when emitting preprocessor output. It will only contain
whitespace when necessary, e.g. to keep two minus signs from merging into to an increment
operator. Useful with the -P option to normalize whitespace such that two files with only
formatting changes are equal.
Only valid with -E on C-like inputs and incompatible with -traditional-cpp.
-fmodule-file=[<name>=]<file>
Specify the mapping of module name to precompiled module file, or load a module file if name is
omitted.
-fmodule-header=<kind>
Build a C++20 Header Unit from a header that should be found in the user (fmodule-header=user) or
system (fmodule-header=system) search path.
-fmodule-header
Build a C++20 Header Unit from a header.
-fmodule-map-file=<file>
Load this module map file
-fmodule-name=<name>
Specify the name of the module to build
-fmodule-output=<value> Save intermediate module file results when compiling a standard C++ module unit.
-fmodule-output
Save intermediate module file results when compiling a standard C++ module unit.
-fmodules-cache-path=<directory>
Specify the module cache path
-fmodules-decluse
Require declaration of modules used within a module
-fmodules-disable-diagnostic-validation
Disable validation of the diagnostic options when loading the module
-fmodules-ignore-macro=<value>
Ignore the definition of the given macro when building and loading modules
-fmodules-prune-after=<seconds>
Specify the interval (in seconds) after which a module file will be considered unused
-fmodules-prune-interval=<seconds>
Specify the interval (in seconds) between attempts to prune the module cache
-fmodules-search-all
Search even non-imported modules to resolve references
-fmodules-strict-decluse
Like -fmodules-decluse but requires all headers to be in modules
-fmodules-user-build-path <directory>
Specify the module user build path
-fmodules-validate-input-files-content
Validate PCM input files based on content if mtime differs
-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
-fmodules-validate-system-headers
Validate the system headers that a module depends on when loading the module
-fmodules
Enable the 'modules' language feature
-fms-compatibility-version=<value>
Dot-separated value representing the Microsoft compiler version number to report in _MSC_VER (0 =
don't define it (default))
-fms-compatibility
Enable full Microsoft Visual C++ compatibility
-fms-extensions
Accept some non-standard constructs supported by the Microsoft compiler
-fms-hotpatch
Ensure that all functions can be hotpatched at runtime
-fms-runtime-lib=<value>
Select Windows run-time library
-fmsc-version=<value>
Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fnew-alignment=<align> Specifies the largest alignment guaranteed by '::operator new(size_t)'
-fnew-infallible
Enable treating throwing global C++ operator new as always returning valid memory (annotates with
__attribute__((returns_nonnull)) and throw()). This is detectable in source.
-fno-aapcs-bitfield-width
Do not follow the AAPCS standard requirement stating that volatile bit-field width is dictated by
the field container type. (ARM only).
-fno-access-control
Disable C++ access control
-fno-addrsig
Don't emit an address-significance table
-fno-assume-sane-operator-new
Don't assume that C++'s global operator new can't alias any pointer
-fno-assume-unique-vtables
Disable optimizations based on vtable pointer identity
-fno-autolink
Disable generation of linker directives for automatic library linking
-fno-builtin-<value>
Disable implicit builtin knowledge of a specific function
-fno-builtin
Disable implicit builtin knowledge of functions
-fno-c++-static-destructors
Disable C++ static destructor registration
-fno-char8_t
Disable C++ builtin type char8_t
-fno-color-diagnostics
Disable colors in diagnostics
-fno-common
Compile common globals like normal definitions
-fno-complete-member-pointers
Do not require member pointer base types to be complete if they would be significant under the
Microsoft ABI
-fno-constant-cfstrings Disable creation of CodeFoundation-type constant strings
-fno-convergent-functions
Assume all functions may be convergent.
-fno-coverage-mapping
Disable code coverage analysis
-fno-crash-diagnostics
Disable auto-generation of preprocessed source files and a script for reproduction during a clang
crash
-fno-cuda-approx-transcendentals
Don't use approximate transcendental functions
-fno-cxx-modules
Disable modules for C++
-fno-debug-macro
Do not emit macro debug information
-fno-declspec
Disallow __declspec as a keyword
-fno-delayed-template-parsing
Disable delayed template parsing
-fno-delete-null-pointer-checks
Do not treat usage of null pointers as undefined behavior
-fno-diagnostics-fixit-info
Do not include fixit information in diagnostics
-fno-diagnostics-show-line-numbers
Show line numbers in diagnostic code snippets
-fno-digraphs
Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:'
-fno-direct-access-external-data
Use GOT indirection to reference external data symbols
-fno-discard-value-names
Do not discard value names in LLVM IR
-fno-dollars-in-identifiers
Disallow '$' in identifiers
-fno-elide-constructors Disable C++ copy constructor elision
-fno-elide-type
Do not elide types when printing diagnostics
-fno-eliminate-unused-debug-types
Emit debug info for defined but unused types
-fno-exceptions
Disable support for exception handling
-fno-experimental-relative-c++-abi-vtables
Do not use the experimental C++ class ABI for classes with virtual tables
-fno-experimental-sanitize-metadata=<value>
Disable emitting metadata for binary analysis sanitizers
-fno-file-reproducible
Use the host's platform-specific path separator character when expanding the __FILE__ macro
-fno-fine-grained-bitfield-accesses
Use large-integer access for consecutive bitfield runs.
-fno-finite-loops
Do not assume that any loop is finite.
-fno-fixed-point
Disable fixed point types
-fno-force-enable-int128
Disable support for int128_t type
-fno-global-isel
Disables the global instruction selector
-fno-gnu-inline-asm
Disable GNU style inline asm
-fno-gpu-allow-device-init
Don't allow device side init function in HIP (experimental)
-fno-gpu-defer-diag
Don't defer host/device related diagnostic messages for CUDA/HIP
-fno-hip-emit-relocatable
Do not override toolchain to compile HIP source to relocatable
-fno-hip-fp32-correctly-rounded-divide-sqrt
Don't specify that single precision floating-point divide and sqrt used in the program source are
correctly rounded (HIP device compilation only)
-fno-hip-kernel-arg-name
Don't specify that kernel argument names are preserved (HIP only)
-fno-hip-new-launch-api Don't use new kernel launching API for HIP
-fno-integrated-as
Disable the integrated assembler
-fno-integrated-cc1
Spawn a separate process for each cc1
-fno-integrated-objemitter
Use external machine object code emitter.
-fno-jump-tables
Do not use jump tables for lowering switches
-fno-keep-persistent-storage-variables
Disable keeping all variables that have a persistent storage duration, including global, static
and thread-local variables, to guarantee that they can be directly addressed
-fno-keep-static-consts Don't keep static const variables even if unused
-fno-knr-functions
Disable support for K&R C function declarations
-fno-lto
Disable LTO mode (default)
-fno-memory-profile
Disable heap memory profiling
-fno-merge-all-constants
Disallow merging of constants
-fno-modules-check-relocated<value>
Skip checks for relocated modules when loading PCM files
-fno-modules-validate-textual-header-includes
Do not enforce -fmodules-decluse and private header restrictions for textual headers. This flag
will be removed in a future Clang release.
-fno-new-infallible
Disable treating throwing global C++ operator new as always returning valid memory (annotates with
__attribute__((returns_nonnull)) and throw()). This is detectable in source.
-fno-objc-infer-related-result-type
do not infer Objective-C related result type based on method family
-fno-offload-lto
Disable LTO mode (default) for offload compilation
-fno-openmp-extensions
Disable all Clang extensions for OpenMP directives and clauses
-fno-operator-names
Do not treat C++ operator name keywords as synonyms for operators
-fno-optimize-sibling-calls
Disable tail call optimization, keeping the call stack accurate
-fno-pch-codegen
Do not generate code for uses of this PCH that assumes an explicit object file will be built for
the PCH
-fno-pch-debuginfo
Do not generate debug info for types in an object file built from this PCH and do not generate
them elsewhere
-fno-plt
Use GOT indirection instead of PLT to make external function calls (x86 only)
-fno-preserve-as-comments
Do not preserve comments in inline assembly
-fno-profile-generate
Disable generation of profile instrumentation.
-fno-profile-instr-generate
Disable generation of profile instrumentation.
-fno-profile-instr-use
Disable using instrumentation data for profile-guided optimization
-fno-pseudo-probe-for-profiling
Do not emit pseudo probes for sample profiling
-fno-register-global-dtors-with-atexit
Don't use atexit or __cxa_atexit to register global destructors
-fno-rtlib-add-rpath
Do not add -rpath with architecture-specific resource directory to the linker flags. When
--hip-link is specified, do not add -rpath with HIP runtime library directory to the linker flags
-fno-rtti-data
Disable generation of RTTI data
-fno-rtti
Disable generation of rtti information
-fno-sanitize-address-globals-dead-stripping
Disable linker dead stripping of globals in AddressSanitizer
-fno-sanitize-address-outline-instrumentation
Use default code inlining logic for the address sanitizer
-fno-sanitize-address-poison-custom-array-cookie
Disable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fno-sanitize-address-use-after-scope
Disable use-after-scope detection in AddressSanitizer
-fno-sanitize-address-use-odr-indicator
Disable ODR indicator globals
-fno-sanitize-cfi-canonical-jump-tables
Do not make the jump table addresses canonical in the symbol table
-fno-sanitize-cfi-cross-dso
Disable control flow integrity (CFI) checks for cross-DSO calls.
-fno-sanitize-coverage=<value>
Disable features of coverage instrumentation for Sanitizers
-fno-sanitize-hwaddress-experimental-aliasing
Disable aliasing mode in HWAddressSanitizer
-fno-sanitize-ignorelist
Don't use ignorelist file for sanitizers
-fno-sanitize-memory-param-retval
Disable detection of uninitialized parameters and return values
-fno-sanitize-memory-track-origins
Disable origins tracking in MemorySanitizer
-fno-sanitize-memory-use-after-dtor
Disable use-after-destroy detection in MemorySanitizer
-fno-sanitize-recover=<value>
Disable recovery for specified sanitizers
-fno-sanitize-stable-abi
Conventional ABI instrumentation for sanitizer runtime. Default: Conventional
-fno-sanitize-stats
Disable sanitizer statistics gathering.
-fno-sanitize-thread-atomics
Disable atomic operations instrumentation in ThreadSanitizer
-fno-sanitize-thread-func-entry-exit
Disable function entry/exit instrumentation in ThreadSanitizer
-fno-sanitize-thread-memory-access
Disable memory access instrumentation in ThreadSanitizer
-fno-sanitize-trap=<value>
Disable trapping for specified sanitizers
-fno-sanitize-trap
Disable trapping for all sanitizers
-fno-short-wchar
Force wchar_t to be an unsigned int
-fno-show-column
Do not include column number on diagnostics
-fno-show-source-location
Do not include source location information with diagnostics
-fno-signed-char
char is unsigned
-fno-signed-zeros
Allow optimizations that ignore the sign of floating point zeros
-fno-spell-checking
Disable spell-checking
-fno-split-machine-functions
Disable late function splitting using profile information (x86 ELF)
-fno-split-stack
Wouldn't use segmented stack
-fno-stack-clash-protection
Disable stack clash protection
-fno-stack-protector
Disable the use of stack protectors
-fno-standalone-debug
Limit debug information produced to reduce size of debug binary
-fno-strict-float-cast-overflow
Relax language rules and try to match the behavior of the target's native float-to-int conversion
instructions
-fno-strict-return
Don't treat control flow paths that fall off the end of a non-void function as unreachable
-fno-sycl
Disables SYCL kernels compilation for device
-fno-temp-file
Directly create compilation output files. This may lead to incorrect incremental builds if the
compiler crashes
-fno-threadsafe-statics Do not emit code to make initialization of local statics thread safe
-fno-trigraphs
Do not process trigraph sequences
-fno-unified-lto
Use distinct LTO pipelines
-fno-unique-section-names
Don't use unique names for text and data sections
-fno-unroll-loops
Turn off loop unroller
-fno-use-cxa-atexit
Don't use __cxa_atexit for calling destructors
-fno-use-init-array
Use .ctors/.dtors instead of .init_array/.fini_array
-fno-visibility-inlines-hidden-static-local-var
Disables -fvisibility-inlines-hidden-static-local-var (this is the default on non-darwin targets)
-fno-xray-function-index
Omit function index section at the expense of single-function patching performance
-fno-zero-initialized-in-bss
Don't place zero initialized data in BSS
-fobjc-arc-exceptions
Use EH-safe code when synthesizing retains and releases in -fobjc-arc
-fobjc-arc
Synthesize retain and release calls for Objective-C pointers
-fobjc-disable-direct-methods-for-testing
Ignore attribute objc_direct so that direct methods can be tested
-fobjc-encode-cxx-class-template-spec
Fully encode c++ class template specialization
-fobjc-exceptions
Enable Objective-C exceptions
-fobjc-runtime=<value>
Specify the target Objective-C runtime kind and version
-fobjc-weak
Enable ARC-style weak references in Objective-C
-foffload-lto=<value>
Set LTO mode for offload compilation
-foffload-lto
Enable LTO in 'full' mode for offload compilation
-fomit-frame-pointer
Omit the frame pointer from functions that don't need it. Some stack unwinding cases, such as
profilers and sanitizers, may prefer specifying -fno-omit-frame-pointer. On many targets, -O1 and
higher omit the frame pointer by default. -m[no-]omit-leaf-frame-pointer takes precedence for leaf
functions
-fopenmp-extensions
Enable all Clang extensions for OpenMP directives and clauses
-fopenmp-offload-mandatory
Do not create a host fallback if offloading to the device fails.
-fopenmp-simd
Emit OpenMP code only for SIMD-based constructs.
-fopenmp-target-debug
Enable debugging in the OpenMP offloading device RTL
-fopenmp-target-jit
Emit code that can be JIT compiled for OpenMP offloading. Implies -foffload-lto=full
-fopenmp-targets=<value>
Specify comma-separated list of triples OpenMP offloading targets to be supported
-fopenmp-version=<value>
Set OpenMP version (e.g. 45 for OpenMP 4.5, 50 for OpenMP 5.0). Default value is 50 for Clang and
11 for Flang
-fopenmp
Parse OpenMP pragmas and generate parallel code.
-foperator-arrow-depth=<value>
Maximum number of 'operator->'s to call for a member access
-foptimization-record-file=<file>
Specify the output name of the file containing the optimization remarks. Implies
-fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch>
options.
-foptimization-record-passes=<regex>
Only include passes which match a specified regular expression in the generated optimization
record (by default, include all passes)
-forder-file-instrumentation
Generate instrumented code to collect order file into default.profraw file (overridden by '=' form
of option or LLVM_PROFILE_FILE env var)
-fpack-struct=<value>
Specify the default maximum struct packing alignment
-fpascal-strings
Recognize and construct Pascal-style string literals
-fpass-plugin=<dsopath> Load pass plugin from a dynamic shared object file (only with new pass manager).
-fpatchable-function-entry=<N,M>
Generate M NOPs before function entry and N-M NOPs after function entry
-fpcc-struct-return
Override the default ABI to return all structs on the stack
-fpch-codegen
Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fpch-debuginfo
Generate debug info for types in an object file built from this PCH and do not generate them
elsewhere
-fpch-instantiate-templates
Instantiate templates already while building a PCH
-fpch-validate-input-files-content
Validate PCH input files based on content if mtime differs
-fplugin-arg-<name>-<arg>
Pass <arg> to plugin <name>
-fplugin=<dsopath>
Load the named plugin (dynamic shared object)
-fprebuilt-implicit-modules
Look up implicit modules in the prebuilt module path
-fprebuilt-module-path=<directory>
Specify the prebuilt module path
-fproc-stat-report=<value>
Save subprocess statistics to the given file
-fproc-stat-report<value>
Print subprocess statistics
-fprofile-arcs
Instrument code to produce gcov data files (*.gcda)
-fprofile-exclude-files=<value>
Instrument only functions from files where names don't match all the regexes separated by a
semi-colon
-fprofile-filter-files=<value>
Instrument only functions from files where names match any regex separated by a semi-colon
-fprofile-function-groups=<N>
Partition functions into N groups and select only functions in group i to be instrumented using
-fprofile-selected-function-group
-fprofile-generate=<directory>
Generate instrumented code to collect execution counts into <directory>/default.profraw
(overridden by LLVM_PROFILE_FILE env var)
-fprofile-generate
Generate instrumented code to collect execution counts into default.profraw (overridden by
LLVM_PROFILE_FILE env var)
-fprofile-instr-generate=<file>
Generate instrumented code to collect execution counts into <file> (overridden by
LLVM_PROFILE_FILE env var)
-fprofile-instr-generate
Generate instrumented code to collect execution counts into default.profraw file (overridden by
'=' form of option or LLVM_PROFILE_FILE env var)
-fprofile-instr-use=<value>
Use instrumentation data for profile-guided optimization
-fprofile-list=<value>
Filename defining the list of functions/files to instrument. The file uses the sanitizer special
case list format.
-fprofile-remapping-file=<file>
Use the remappings described in <file> to match the profile data against names in the program
-fprofile-sample-accurate
Specifies that the sample profile is accurate
-fprofile-sample-use=<value>
Enable sample-based profile guided optimizations
-fprofile-selected-function-group=<i>
Partition functions into N groups using -fprofile-function-groups and select only functions in
group i to be instrumented. The valid range is 0 to N-1 inclusive
-fprofile-update=<method>
Set update method of profile counters
-fprofile-use=<pathname>
Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads
from <pathname>/default.profdata. Otherwise, it reads from file <pathname>.
-fprotect-parens
Determines whether the optimizer honors parentheses when floating-point expressions are evaluated
-fpseudo-probe-for-profiling
Emit pseudo probes for sample profiling
-frandomize-layout-seed-file=<file>
File holding the seed used by the randomize structure layout feature
-frandomize-layout-seed=<seed>
The seed used by the randomize structure layout feature
-freciprocal-math
Allow division operations to be reassociated
-freg-struct-return
Override the default ABI to return small structs in registers
-fregister-global-dtors-with-atexit
Use atexit or __cxa_atexit to register global destructors
-frelaxed-template-template-args
Enable C++17 relaxed template template argument matching
-freroll-loops
Turn on loop reroller
-fropi Generate read-only position independent code (ARM only)
-frtlib-add-rpath
Add -rpath with architecture-specific resource directory to the linker flags. When --hip-link is
specified, also add -rpath with HIP runtime library directory to the linker flags
-frwpi Generate read-write position independent code (ARM only)
-fsafe-buffer-usage-suggestions
Display suggestions to update code associated with -Wunsafe-buffer-usage warnings
-fsample-profile-use-profi
Use profi to infer block and edge counts
-fsanitize-address-destructor=<value>
Set the kind of module destructors emitted by AddressSanitizer instrumentation. These destructors
are emitted to unregister instrumented global variables when code is unloaded (e.g. via
`dlclose()`).
-fsanitize-address-field-padding=<value>
Level of field padding for AddressSanitizer
-fsanitize-address-globals-dead-stripping
Enable linker dead stripping of globals in AddressSanitizer
-fsanitize-address-outline-instrumentation
Always generate function calls for address sanitizer instrumentation
-fsanitize-address-poison-custom-array-cookie
Enable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fsanitize-address-use-after-return=<mode>
Select the mode of detecting stack use-after-return in AddressSanitizer
-fsanitize-address-use-after-scope
Enable use-after-scope detection in AddressSanitizer
-fsanitize-address-use-odr-indicator
Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs
at the cost of an increase in binary size
-fsanitize-blacklist=<value>
Alias for -fsanitize-ignorelist=
-fsanitize-cfi-canonical-jump-tables
Make the jump table addresses canonical in the symbol table
-fsanitize-cfi-cross-dso
Enable control flow integrity (CFI) checks for cross-DSO calls.
-fsanitize-cfi-icall-experimental-normalize-integers
Normalize integers in CFI indirect call type signature checks
-fsanitize-cfi-icall-generalize-pointers
Generalize pointers in CFI indirect call type signature checks
-fsanitize-coverage-allowlist=<value>
Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the
provided special case list, except the blocked ones
-fsanitize-coverage-ignorelist=<value>
Disable sanitizer coverage instrumentation for modules and functions that match the provided
special case list, even the allowed ones
-fsanitize-coverage=<value>
Specify the type of coverage instrumentation for Sanitizers
-fsanitize-hwaddress-abi=<value>
Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This
option is currently unused.
-fsanitize-hwaddress-experimental-aliasing
Enable aliasing mode in HWAddressSanitizer
-fsanitize-ignorelist=<value>
Path to ignorelist file for sanitizers
-fsanitize-memory-param-retval
Enable detection of uninitialized parameters and return values
-fsanitize-memory-track-origins=<value>
Enable origins tracking in MemorySanitizer
-fsanitize-memory-track-origins
Enable origins tracking in MemorySanitizer
-fsanitize-memory-use-after-dtor
Enable use-after-destroy detection in MemorySanitizer
-fsanitize-memtag-mode=<value>
Set default MTE mode to 'sync' (default) or 'async'
-fsanitize-recover=<value>
Enable recovery for specified sanitizers
-fsanitize-stable-abi
Stable ABI instrumentation for sanitizer runtime. Default: Conventional
-fsanitize-stats
Enable sanitizer statistics gathering.
-fsanitize-system-ignorelist=<value>
Path to system ignorelist file for sanitizers
-fsanitize-thread-atomics
Enable atomic operations instrumentation in ThreadSanitizer (default)
-fsanitize-thread-func-entry-exit
Enable function entry/exit instrumentation in ThreadSanitizer (default)
-fsanitize-thread-memory-access
Enable memory access instrumentation in ThreadSanitizer (default)
-fsanitize-trap=<value> Enable trapping for specified sanitizers
-fsanitize-trap
Enable trapping for all sanitizers
-fsanitize-undefined-strip-path-components=<number>
Strip (or keep only, if negative) a given number of path components when emitting check metadata.
-fsanitize=<check>
Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for
available checks
-fsave-optimization-record=<format>
Generate an optimization record file in a specific format
-fsave-optimization-record
Generate a YAML optimization record file
-fseh-exceptions
Use SEH style exceptions
-fshort-enums
Allocate to an enum type only as many bytes as it needs for the declared range of possible values
-fshort-wchar
Force wchar_t to be a short unsigned int
-fshow-overloads=<value>
Which overload candidates to show when overload resolution fails. Defaults to 'all'
-fshow-skipped-includes Show skipped includes in -H output.
-fsigned-char
char is signed
-fsized-deallocation
Enable C++14 sized global deallocation functions
-fsjlj-exceptions
Use SjLj style exceptions
-fslp-vectorize
Enable the superword-level parallelism vectorization passes
-fspell-checking-limit=<value>
Set the maximum number of times to perform spell checking on unrecognized identifiers (0 = no
limit)
-fsplit-dwarf-inlining
Provide minimal debug info in the object/executable to facilitate online symbolication/stack
traces in the absence of .dwo/.dwp files when using Split DWARF
-fsplit-lto-unit
Enables splitting of the LTO unit
-fsplit-machine-functions
Enable late function splitting using profile information (x86 ELF)
-fsplit-stack
Use segmented stack
-fstack-clash-protection
Enable stack clash protection
-fstack-protector-all
Enable stack protectors for all functions
-fstack-protector-strong
Enable stack protectors for some functions vulnerable to stack smashing. Compared to
-fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any
size (and any type), as well as any calls to alloca or the taking of an address from a local
variable
-fstack-protector
Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose
heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or
constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8
bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack
protector has a guard value added to the stack frame that is checked on function exit. The guard
value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable
will overwrite the guard value before overwriting the function's return address. The reference
stack guard value is stored in a global variable.
-fstack-size-section
Emit section containing metadata on function stack sizes
-fstack-usage
Emit .su file containing information on function stack sizes
-fstandalone-debug
Emit full debug info for all types used by the program
-fstrict-enums
Enable optimizations based on the strict definition of an enum's value range
-fstrict-flex-arrays=<n>
Enable optimizations based on the strict definition of flexible arrays
-fstrict-float-cast-overflow
Assume that overflowing float-to-int casts are undefined (default)
-fstrict-vtable-pointers
Enable optimizations based on the strict rules for overwriting polymorphic C++ objects
-fswift-async-fp=<option>
Control emission of Swift async extended frame info
-fsycl Enables SYCL kernels compilation for device
-fsyntax-only
Run the preprocessor, parser and semantic analysis stages
-fsystem-module
Build this module as a system module. Only used with -emit-module
-ftemplate-backtrace-limit=<value>
Set the maximum number of entries to print in a template instantiation backtrace (0 = no limit)
-ftemplate-depth=<value>
Set the maximum depth of recursive template instantiation
-ftest-coverage
Produce gcov notes files (*.gcno)
-fthin-link-bitcode=<value>
Write minimized bitcode to <file> for the ThinLTO thin link only
-fthinlto-index=<value> Perform ThinLTO importing using provided function summary index
-ftime-report=<value>
(For new pass manager) 'per-pass': one report for each pass; 'per-pass-run': one report for each
pass invocation
-ftime-trace-granularity=<value>
Minimum time granularity (in microseconds) traced by time profiler
-ftime-trace=<value>
Similar to -ftime-trace. Specify the JSON file or a directory which will contain the JSON file
-ftime-trace
Turn on time profiler. Generates JSON file based on output filename.
-ftrap-function=<value> Issue call to specified function rather than a trap instruction
-ftrapv-handler=<function name>
Specify the function to be called on overflow
-ftrapv
Trap on integer overflow
-ftrigraphs
Process trigraph sequences
-ftrivial-auto-var-init-stop-after=<value>
Stop initializing trivial automatic stack variables after the specified number of instances
-ftrivial-auto-var-init=<value>
Initialize trivial automatic stack variables. Defaults to 'uninitialized'
-funified-lto
Use the unified LTO pipeline
-funique-basic-block-section-names
Use unique names for basic block sections (ELF Only)
-funique-internal-linkage-names
Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path
-funroll-loops
Turn on loop unroller
-funsafe-math-optimizations
Allow unsafe floating-point math optimizations which may decrease precision
-fuse-cuid=<value>
Method to generate ID's for compilation units for single source offloading languages CUDA and HIP:
'hash' (ID's generated by hashing file path and command line options) | 'random' (ID's generated
as random numbers) | 'none' (disabled). Default is 'hash'. This option will be overridden by
option '-cuid=[ID]' if it is specified.
-fuse-line-directives
Use #line in preprocessed output
-fvalidate-ast-input-files-content
Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are
considered valid if both contents is identical
-fveclib=<value>
Use the given vector functions library
-fvectorize
Enable the loop vectorization passes
-fverbose-asm
Generate verbose assembly output
-fvirtual-function-elimination
Enables dead virtual function elimination optimization. Requires -flto=full
-fvisibility-dllexport=<value>
The visibility for dllexport definitions [-fvisibility-from-dllstorageclass]
-fvisibility-externs-dllimport=<value>
The visibility for dllimport external declarations [-fvisibility-from-dllstorageclass]
-fvisibility-externs-nodllstorageclass=<value>
The visibility for external declarations without an explicit DLL dllstorageclass
[-fvisibility-from-dllstorageclass]
-fvisibility-from-dllstorageclass
Set the visibility of symbols in the generated code from their DLL storage class
-fvisibility-global-new-delete-hidden
Give global C++ operator new and delete declarations hidden visibility
-fvisibility-inlines-hidden-static-local-var
When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will
also be given hidden visibility by default
-fvisibility-inlines-hidden
Give inline C++ member functions hidden visibility by default
-fvisibility-ms-compat
Give global types 'default' visibility and global functions and variables 'hidden' visibility by
default
-fvisibility-nodllstorageclass=<value>
The visibility for definitions without an explicit DLL export class
[-fvisibility-from-dllstorageclass]
-fvisibility=<value>
Set the default symbol visibility for all global definitions
-fwasm-exceptions
Use WebAssembly style exceptions
-fwhole-program-vtables Enables whole-program vtable optimization. Requires -flto
-fwrapv
Treat signed integer overflow as two's complement
-fwritable-strings
Store string literals as writable data
-fxl-pragma-pack
Enable IBM XL #pragma pack handling
-fxray-always-emit-customevents
Always emit __xray_customevent(...) calls even if the containing function is not always
instrumented
-fxray-always-emit-typedevents
Always emit __xray_typedevent(...) calls even if the containing function is not always
instrumented
-fxray-always-instrument=<value>
DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute.
-fxray-attr-list=<value>
Filename defining the list of functions/types for imbuing XRay attributes.
-fxray-function-groups=<value>
Only instrument 1 of N groups
-fxray-ignore-loops
Don't instrument functions with loops unless they also meet the minimum function size
-fxray-instruction-threshold=<value>
Sets the minimum function size to instrument with XRay
-fxray-instrumentation-bundle=<value>
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-instrument
Generate XRay instrumentation sleds on function entry and exit
-fxray-link-deps
Link XRay runtime library when -fxray-instrument is specified (default)
-fxray-modes=<value>
List of modes to link in by default into XRay instrumented binaries.
-fxray-never-instrument=<value>
DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute.
-fxray-selected-function-group=<value>
When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0
to fxray-function-groups - 1
-fzero-call-used-regs=<value>
Clear call-used registers upon function return (AArch64/x86 only)
-fzvector
Enable System z vector language extension
-F <value>
Add directory to framework include search path
--gcc-install-dir=<value>
Use GCC installation in the specified directory. The directory ends with path components like
'lib{,32,64}/gcc{,-cross}/$triple/$version'. Note: executables (e.g. ld) used by the compiler are
not overridden by the selected GCC installation
--gcc-toolchain=<value> Specify a directory where Clang can find 'include' and
'lib{,32,64}/gcc{,-cross}/$triple/$version'. Clang will use the GCC installation with the largest
version
-gcodeview-command-line Emit compiler path and command line into CodeView debug information
-gcodeview-ghash
Emit type record hashes in a .debug$H section
-gcodeview
Generate CodeView debug information
-gdwarf-2
Generate source-level debug information with dwarf version 2
-gdwarf-3
Generate source-level debug information with dwarf version 3
-gdwarf-4
Generate source-level debug information with dwarf version 4
-gdwarf-5
Generate source-level debug information with dwarf version 5
-gdwarf32
Enables DWARF32 format for ELF binaries, if debug information emission is enabled.
-gdwarf64
Enables DWARF64 format for ELF binaries, if debug information emission is enabled.
-gdwarf
Generate source-level debug information with the default dwarf version
-gembed-source
Embed source text in DWARF debug sections
-gen-reproducer=<value> Emit reproducer on (option: off, crash (default), error, always)
-gline-directives-only
Emit debug line info directives only
-gline-tables-only
Emit debug line number tables only
-gmodules
Generate debug info with external references to clang modules or precompiled headers
-gno-codeview-command-line
Don't emit compiler path and command line into CodeView debug information
-gno-embed-source
Restore the default behavior of not embedding source text in DWARF debug sections
-gno-inline-line-tables Don't emit inline line tables.
--gpu-bundle-output
Bundle output files of HIP device compilation
--gpu-instrument-lib=<value>
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=<value>
Default max threads per block for kernel launch bounds for HIP
-gsplit-dwarf=<value>
Set DWARF fission mode
-gstrict-dwarf
Restrict DWARF features to those defined in the specified version, avoiding features from later
versions.
-gz=<value>
DWARF debug sections compression type
-G <size>
Put objects of at most <size> bytes into small data section (MIPS / Hexagon)
-g Generate source-level debug information
--help-hidden
Display help for hidden options
-help Display available options
--hip-device-lib=<value>
HIP device library
--hip-link
Link clang-offload-bundler bundles for HIP
--hip-path=<value>
HIP runtime installation path, used for finding HIP version and adding HIP include path.
--hip-version=<value>
HIP version in the format of major.minor.patch
--hipspv-pass-plugin=<dsopath>
path to a pass plugin for HIP to SPIR-V passes.
-H Show header includes and nesting depth
-I- Restrict all prior -I flags to double-quoted inclusion and remove current directory from include
path
-ibuiltininc
Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc.
Using -nobuiltininc after the option disables it
-idirafter <value>
Add directory to AFTER include search path
-iframeworkwithsysroot <directory>
Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot
-iframework <value>
Add directory to SYSTEM framework search path
-imacros <file>
Include macros from file before parsing
-include-pch <file>
Include precompiled header file
-include <file>
Include file before parsing
-index-header-map
Make the next included directory (-I or -F) an indexer header map
-iprefix <dir>
Set the -iwithprefix/-iwithprefixbefore prefix
-iquote <directory>
Add directory to QUOTE include search path
-isysroot <dir>
Set the system root directory (usually /)
-isystem-after <directory>
Add directory to end of the SYSTEM include search path
-isystem <directory>
Add directory to SYSTEM include search path
-ivfsoverlay <value>
Overlay the virtual filesystem described by file over the real file system
-iwithprefixbefore <dir>
Set directory to include search path with prefix
-iwithprefix <dir>
Set directory to SYSTEM include search path with prefix
-iwithsysroot <directory>
Add directory to SYSTEM include search path, absolute paths are relative to -isysroot
-I <dir>
Add directory to the end of the list of include search paths
--libomptarget-amdgcn-bc-path=<value>
Path to libomptarget-amdgcn bitcode library
--libomptarget-amdgpu-bc-path=<value>
Path to libomptarget-amdgcn bitcode library
--libomptarget-nvptx-bc-path=<value>
Path to libomptarget-nvptx bitcode library
-L <dir>
Add directory to library search path
-mabi=quadword-atomics
Enable quadword atomics ABI on AIX (AIX PPC64 only). Uses lqarx/stqcx. instructions.
-mabicalls
Enable SVR4-style position-independent code (Mips only)
-maix-struct-return
Return all structs in memory (PPC32 only)
-malign-branch-boundary=<value>
Specify the boundary's size to align branches
-malign-branch=<value>
Specify types of branches to align
-malign-double
Align doubles to two words in structs (x86 only)
-maltivec
Enable AltiVec vector initializer syntax
-mamdgpu-ieee
Sets the IEEE bit in the expected default floating point mode register. Floating point opcodes
that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008.
This option changes the ABI. (AMDGPU only)
-march=<value>
For a list of available architectures for the target use '-mcpu=help'
-mbackchain
Link stack frames through backchain on System Z
-mbranch-protection=<value>
Enforce targets of indirect branches and function returns
-mbranches-within-32B-boundaries
Align selected branches (fused, jcc, jmp) within 32-byte boundary
-mcabac
Enable CABAC instructions
-mcmodel=medany
Equivalent to -mcmodel=medium, compatible with RISC-V gcc.
-mcmodel=medlow
Equivalent to -mcmodel=small, compatible with RISC-V gcc.
-mcmse Allow use of CMSE (Armv8-M Security Extensions)
-mcode-object-version=<value>
Specify code object ABI version. Defaults to 4. (AMDGPU only)
-mcpu=<value>
For a list of available CPUs for the target use '-mcpu=help'
-mcrbits
Control the CR-bit tracking feature on PowerPC. ``-mcrbits`` (the enablement of CR-bit tracking
support) is the default for POWER8 and above, as well as for all other CPUs when optimization is
applied (-O2 and above).
-mcrc Allow use of CRC instructions (ARM/Mips only)
-mcumode
Specify CU wavefront execution mode (AMDGPU only)
-mdefault-visibility-export-mapping=<value>
Mapping between default visibility and export
-mdouble=<n
Force double to be <n> bits
-MD Write a depfile containing user and system headers
-meabi <value>
Set EABI type. Default depends on triple)
-membedded-data
Place constants in the .rodata section instead of the .sdata section even if they meet the -G
<size> threshold (MIPS)
-menable-experimental-extensions
Enable use of experimental RISC-V extensions.
-mexec-model=<value>
Execution model (WebAssembly only)
-mexecute-only
Disallow generation of data access to code sections (ARM only)
-mextern-sdata
Assume that externally defined data is in the small data if it meets the -G <size> threshold
(MIPS)
-mfentry
Insert calls to fentry at function entry (x86/SystemZ only)
-mfix-cmse-cve-2021-35465
Work around VLLDM erratum CVE-2021-35465 (ARM only)
-mfix-cortex-a53-835769 Workaround Cortex-A53 erratum 835769 (AArch64 only)
-mfix-cortex-a57-aes-1742098
Work around Cortex-A57 Erratum 1742098 (ARM only)
-mfix-cortex-a72-aes-1655431
Work around Cortex-A72 Erratum 1655431 (ARM only)
-mfp32 Use 32-bit floating point registers (MIPS only)
-mfp64 Use 64-bit floating point registers (MIPS only)
-mframe-chain=<value>
Select the frame chain model used to emit frame records (Arm only).
-mfunction-return=<value>
Replace returns with jumps to ``__x86_return_thunk`` (x86 only, error otherwise)
-MF <file>
Write depfile output from -MMD, -MD, -MM, or -M to <file>
-mgeneral-regs-only
Generate code which only uses the general purpose registers (AArch64/x86 only)
-mglobal-merge
Enable merging of globals
-mgpopt
Use GP relative accesses for symbols known to be in a small data section (MIPS)
-mguard=<value>
Enable or disable Control Flow Guard checks and guard tables emission
-MG Add missing headers to depfile
-mharden-sls=<value>
Select straight-line speculation hardening scope (ARM/AArch64/X86 only). <arg> must be: all, none,
retbr(ARM/AArch64), blr(ARM/AArch64), comdat(ARM/AArch64), nocomdat(ARM/AArch64), return(X86),
indirect-jmp(X86)
-mhvx-ieee-fp
Enable Hexagon HVX IEEE floating-point
-mhvx-length=<value>
Set Hexagon Vector Length
-mhvx-qfloat
Enable Hexagon HVX QFloat instructions
-mhvx=<value>
Enable Hexagon Vector eXtensions
-mhvx Enable Hexagon Vector eXtensions
-miamcu
Use Intel MCU ABI
-mignore-xcoff-visibility
Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility
in XCOFF object file
--migrate
Run the migrator
-mincremental-linker-compatible
(integrated-as) Emit an object file which can be used with an incremental linker
-mindirect-branch-cs-prefix
Add cs prefix to call and jmp to indirect thunk
-mindirect-jump=<value> Change indirect jump instructions to inhibit speculation
-mios-version-min=<value>
Set iOS deployment target
-MJ <value>
Write a compilation database entry per input
-mllvm=<arg>
Alias for -mllvm
-mllvm <value>
Additional arguments to forward to LLVM's option processing
-mlocal-sdata
Extend the -G behaviour to object local data (MIPS)
-mlong-calls
Generate branches with extended addressability, usually via indirect jumps.
-mlong-double-128
Force long double to be 128 bits
-mlong-double-64
Force long double to be 64 bits
-mlong-double-80
Force long double to be 80 bits, padded to 128 bits for storage
-mlvi-cfi
Enable only control-flow mitigations for Load Value Injection (LVI)
-mlvi-hardening
Enable all mitigations for Load Value Injection (LVI)
-mmacos-version-min=<value>
Set macOS deployment target
-mmadd4
Enable the generation of 4-operand madd.s, madd.d and related instructions.
-mmark-bti-property
Add .note.gnu.property with BTI to assembly files (AArch64 only)
-MMD Write a depfile containing user headers
-mmemops
Enable generation of memop instructions
-mmlir <value>
Additional arguments to forward to MLIR's option processing
-mms-bitfields
Set the default structure layout to be compatible with the Microsoft compiler standard
-mmsa Enable MSA ASE (MIPS only)
-mmt Enable MT ASE (MIPS only)
-MM Like -MMD, but also implies -E and writes to stdout by default
-mno-abicalls
Disable SVR4-style position-independent code (Mips only)
-mno-bti-at-return-twice
Do not add a BTI instruction after a setjmp or other return-twice construct (Arm/AArch64 only)
-mno-crc
Disallow use of CRC instructions (Mips only)
-mno-cumode
Specify WGP wavefront execution mode (AMDGPU only)
-mno-embedded-data
Do not place constants in the .rodata section instead of the .sdata if they meet the -G <size>
threshold (MIPS)
-mno-execute-only
Allow generation of data access to code sections (ARM only)
-mno-extern-sdata
Do not assume that externally defined data is in the small data if it meets the -G <size>
threshold (MIPS)
-mno-fix-cmse-cve-2021-35465
Don't work around VLLDM erratum CVE-2021-35465 (ARM only)
-mno-fix-cortex-a53-835769
Don't workaround Cortex-A53 erratum 835769 (AArch64 only)
-mno-fix-cortex-a57-aes-1742098
Don't work around Cortex-A57 Erratum 1742098 (ARM only)
-mno-fix-cortex-a72-aes-1655431
Don't work around Cortex-A72 Erratum 1655431 (ARM only)
-mno-fmv
Disable function multiversioning
-mno-gather
Disable generation of gather instructions in auto-vectorization(x86 only)
-mno-global-merge
Disable merging of globals
-mno-gpopt
Do not use GP relative accesses for symbols known to be in a small data section (MIPS)
-mno-hvx-ieee-fp
Disable Hexagon HVX IEEE floating-point
-mno-hvx-qfloat
Disable Hexagon HVX QFloat instructions
-mno-hvx
Disable Hexagon Vector eXtensions
-mno-implicit-float
Don't generate implicit floating point or vector instructions
-mno-incremental-linker-compatible
(integrated-as) Emit an object file which cannot be used with an incremental linker
-mno-local-sdata
Do not extend the -G behaviour to object local data (MIPS)
-mno-long-calls
Restore the default behaviour of not generating long calls
-mno-lvi-cfi
Disable control-flow mitigations for Load Value Injection (LVI)
-mno-lvi-hardening
Disable mitigations for Load Value Injection (LVI)
-mno-madd4
Disable the generation of 4-operand madd.s, madd.d and related instructions.
-mno-memops
Disable generation of memop instructions
-mno-movt
Disallow use of movt/movw pairs (ARM only)
-mno-ms-bitfields
Do not set the default structure layout to be compatible with the Microsoft compiler standard
-mno-msa
Disable MSA ASE (MIPS only)
-mno-mt
Disable MT ASE (MIPS only)
-mno-neg-immediates
Disallow converting instructions with negative immediates to their negation or inversion.
-mno-nvj
Disable generation of new-value jumps
-mno-nvs
Disable generation of new-value stores
-mno-outline-atomics
Don't generate local calls to out-of-line atomic operations
-mno-outline
Disable function outlining (AArch64 only)
-mno-packets
Disable generation of instruction packets
-mno-pic-data-is-text-relative
Don't assume data segments are relative to text segment
-mno-relax
Disable linker relaxation
-mno-restrict-it
Allow generation of complex IT blocks.
-mno-save-restore
Disable using library calls for save and restore
-mno-scatter
Disable generation of scatter instructions in auto-vectorization(x86 only)
-mno-seses
Disable speculative execution side effect suppression (SESES)
-mno-stack-arg-probe
Disable stack probes which are enabled by default
-mno-tgsplit
Disable threadgroup split execution mode (AMDGPU only)
-mno-tls-direct-seg-refs
Disable direct TLS access through segment registers
-mno-unaligned-access
Force all memory accesses to be aligned (AArch32/AArch64/LoongArch only)
-mno-wavefrontsize64
Specify wavefront size 32 mode (AMDGPU only)
-mnocrc
Disallow use of CRC instructions (ARM only)
-mnop-mcount
Generate mcount/__fentry__ calls as nops. To activate they need to be patched in.
-mnvj Enable generation of new-value jumps
-mnvs Enable generation of new-value stores
-module-dependency-dir <value>
Directory to dump module dependencies to
-module-file-info
Provide information about a particular module file
-momit-leaf-frame-pointer
Omit frame pointer setup for leaf functions
-moutline-atomics
Generate local calls to out-of-line atomic operations
-moutline
Enable function outlining (AArch64 only)
-mpacked-stack
Use packed stack layout (SystemZ only).
-mpackets
Enable generation of instruction packets
-mpad-max-prefix-size=<value>
Specify maximum number of prefixes to use for padding
-mpic-data-is-text-relative
Assume data segments are relative to text segment
-mprefer-vector-width=<value>
Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target
specific decisions.
-mprintf-kind=<value>
Specify the printf lowering scheme (AMDGPU only), allowed values are "hostcall"(printing happens
during kernel execution, this scheme relies on hostcalls which require system to support pcie
atomics) and "buffered"(printing happens after all kernel threads exit, this uses a printf buffer
and does not rely on pcie atomic support)
-MP Create phony target for each dependency (other than main file)
-mqdsp6-compat
Enable hexagon-qdsp6 backward compatibility
-MQ <value>
Specify name of main file output to quote in depfile
-mrecip=<value>
Control use of approximate reciprocal and reciprocal square root instructions followed by <n>
iterations of Newton-Raphson refinement. <value> = ( ['!'] ['vec-'] ('rcp'|'sqrt') [('h'|'s'|'d')]
[':'<n>] ) | 'all' | 'default' | 'none'
-mrecip
Equivalent to '-mrecip=all'
-mrecord-mcount
Generate a __mcount_loc section entry for each __fentry__ call.
-mrelax-all
(integrated-as) Relax all machine instructions
-mrelax
Enable linker relaxation
-mrestrict-it
Disallow generation of complex IT blocks. It is off by default.
-mrtd Make StdCall calling convention the default
-mrvv-vector-bits=<value>
Specify the size in bits of an RVV vector register. Defaults to the vector length agnostic value
of "scalable". Accepts power of 2 values between 64 and 65536. Also accepts "zvl" to use the value
implied by -march/-mcpu. Value will be reflected in __riscv_v_fixed_vlen preprocessor define
(RISC-V only)
-msave-restore
Enable using library calls for save and restore
-mseses
Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity
mitigations
-msign-return-address=<value>
Select return address signing scope
-mskip-rax-setup
Skip setting up RAX register when passing variable arguments (x86 only)
-msmall-data-limit=<value>
Put global and static data smaller than the limit into a special section
-msoft-float
Use software floating point
-mstack-alignment=<value>
Set the stack alignment
-mstack-arg-probe
Enable stack probes
-mstack-probe-size=<value>
Set the stack probe size
-mstack-protector-guard-offset=<value>
Use the given offset for addressing the stack-protector guard
-mstack-protector-guard-reg=<value>
Use the given reg for addressing the stack-protector guard
-mstack-protector-guard-symbol=<value>
Use the given symbol for addressing the stack-protector guard
-mstack-protector-guard=<value>
Use the given guard (global, tls) for addressing the stack-protector guard
-mstackrealign
Force realign the stack at entry to every function
-msve-vector-bits=<value>
Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value
of "scalable". (AArch64 only)
-msvr4-struct-return
Return small structs in registers (PPC32 only)
-mtargetos=<value>
Set the deployment target to be the specified OS and OS version
-mtgsplit
Enable threadgroup split execution mode (AMDGPU only)
-mthread-model <value>
The thread model to use. Defaults to 'posix')
-mtls-direct-seg-refs
Enable direct TLS access through segment registers (default)
-mtls-size=<value>
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=<value>
Thread pointer access method. For AArch32: 'soft' uses a function call, or 'tpidrurw', 'tpidruro'
or 'tpidrprw' use the three CP15 registers. 'cp15' is an alias for 'tpidruro'. For AArch64:
'tpidr_el0', 'tpidr_el1', 'tpidr_el2', 'tpidr_el3' or 'tpidrro_el0' use the five system registers.
'elN' is an alias for 'tpidr_elN'.
-mtune=<value>
Only supported on AArch64, PowerPC, RISC-V, SystemZ, and X86
-MT <value>
Specify name of main file output in depfile
-munaligned-access
Allow memory accesses to be unaligned (AArch32/AArch64/LoongArch only)
-munsafe-fp-atomics
Enable generation of unsafe floating point atomic instructions. May generate more efficient code,
but may not respect rounding and denormal modes, and may give incorrect results for certain memory
destinations. (AMDGPU only)
-mvscale-max=<value>
Specify the vscale maximum. Defaults to the vector length agnostic value of "0". (AArch64/RISC-V
only)
-mvscale-min=<value>
Specify the vscale minimum. Defaults to "1". (AArch64/RISC-V only)
-MV Use NMake/Jom format for the depfile
-mwavefrontsize64
Specify wavefront size 64 mode (AMDGPU only)
-mxcoff-build-id=<0xHEXSTRING>
On AIX, request creation of a build-id string, "0xHEXSTRING", in the string table of the loader
section inside the linked binary
-mxcoff-roptr
Place constant objects with relocatable address values in the RO data section and add -bforceimprw
to the linker flags (AIX only)
-mzos-hlq-clang=<ClangHLQ>
High level qualifier for z/OS C++RT side deck datasets
-mzos-hlq-csslib=<CsslibHLQ>
High level qualifier for z/OS CSSLIB dataset
-mzos-hlq-le=<LeHLQ>
High level qualifier for z/OS Language Environment datasets
-mzos-sys-include=<SysInclude>
Path to system headers on z/OS
-M Like -MD, but also implies -E and writes to stdout by default
--no-cuda-include-ptx=<value>
Do not include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more
than once.
--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.
--no-default-config
Disable loading default configuration files
--no-gpu-bundle-output
Do not bundle output files of HIP device compilation
-no-hip-rt
Do not link against HIP runtime libraries
--no-offload-arch=<value>
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-offload-new-driver Don't Use the new driver for offloading compilation.
--no-system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as not including a system header.
-nobuiltininc
Disable builtin #include directories
-nogpuinc
Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers
-nogpulib
Do not link device library for CUDA/HIP device compilation
-nohipwrapperinc
Do not include the default HIP wrapper headers and include paths
-nostdinc++
Disable standard #include directories for the C++ standard library
--nvptx-arch-tool=<value>
Tool used for detecting NVIDIA GPU arch in the system.
-ObjC++
Treat source input files as Objective-C++ inputs
-objcmt-allowlist-dir-path=<value>
Only modify files with a filename contained in the provided directory path
-objcmt-atomic-property Make migration to 'atomic' properties
-objcmt-migrate-all
Enable migration to modern ObjC
-objcmt-migrate-annotation
Enable migration to property and method annotations
-objcmt-migrate-designated-init
Enable migration to infer NS_DESIGNATED_INITIALIZER for initializer methods
-objcmt-migrate-instancetype
Enable migration to infer instancetype for method result type
-objcmt-migrate-literals
Enable migration to modern ObjC literals
-objcmt-migrate-ns-macros
Enable migration to NS_ENUM/NS_OPTIONS macros
-objcmt-migrate-property-dot-syntax
Enable migration of setter/getter messages to property-dot syntax
-objcmt-migrate-property
Enable migration to modern ObjC property
-objcmt-migrate-protocol-conformance
Enable migration to add protocol conformance on classes
-objcmt-migrate-readonly-property
Enable migration to modern ObjC readonly property
-objcmt-migrate-readwrite-property
Enable migration to modern ObjC readwrite property
-objcmt-migrate-subscripting
Enable migration to modern ObjC subscripting
-objcmt-ns-nonatomic-iosonly
Enable migration to use NS_NONATOMIC_IOSONLY macro for setting property's 'atomic' attribute
-objcmt-returns-innerpointer-property
Enable migration to annotate property with NS_RETURNS_INNER_POINTER
-objcmt-whitelist-dir-path=<value>
Alias for -objcmt-allowlist-dir-path
-ObjC Treat source input files as Objective-C inputs
-object-file-name=<file>
Set the output <file> for debug infos
--offload-arch=<value>
Specify an offloading device architecture for CUDA, HIP, or OpenMP. (e.g. sm_35). If 'native' is
used the compiler will detect locally installed architectures. For HIP offloading, the device
architecture can be followed by target ID features delimited by a colon (e.g.
gfx908:xnack+:sramecc-). May be specified more than once.
--offload-device-only
Only compile for the offloading device.
--offload-host-device
Only compile for the offloading host.
--offload-host-only
Only compile for the offloading host.
--offload-link
Use the new offloading linker to perform the link job.
--offload-new-driver
Use the new driver for offloading compilation.
--offload=<value>
Specify comma-separated list of offloading target triples (CUDA and HIP only)
-o <file>
Write output to <file>
-pedantic
Warn on language extensions
-pg Enable mcount instrumentation
-pipe Use pipes between commands, when possible
--precompile
Only precompile the input
-print-diagnostic-options
Print all of Clang's warning options
-print-effective-triple Print the effective target triple
-print-file-name=<file> Print the full library path of <file>
-print-ivar-layout
Enable Objective-C Ivar layout bitmap print trace
-print-libgcc-file-name Print the library path for the currently used compiler runtime library
("libgcc.a" or "libclang_rt.builtins.*.a")
-print-multi-flags-experimental
Print the flags used for selecting multilibs (experimental)
-print-prog-name=<name> Print the full program path of <name>
-print-resource-dir
Print the resource directory pathname
-print-rocm-search-dirs Print the paths used for finding ROCm installation
-print-runtime-dir
Print the directory pathname containing clangs runtime libraries
-print-search-dirs
Print the paths used for finding libraries and programs
-print-supported-cpus
Print supported cpu models for the given target (if target is not specified, it will print the
supported cpus for the default target)
-print-target-triple
Print the normalized target triple
-print-targets
Print the registered targets
-pthread
Support POSIX threads in generated code
--ptxas-path=<value>
Path to ptxas (used for compiling CUDA code)
-P Disable linemarker output in -E mode
-p Enable mcount instrumentation with prof
-Qn Do not emit metadata containing compiler name and version
-Qunused-arguments
Don't emit warning for unused driver arguments
-Qy Emit metadata containing compiler name and version
-relocatable-pch
Whether to build a relocatable precompiled header
-rewrite-legacy-objc
Rewrite Legacy Objective-C source to C++
-rewrite-objc
Rewrite Objective-C source to C++
--rocm-device-lib-path=<value>
ROCm device library path. Alternative to rocm-path.
--rocm-path=<value>
ROCm installation path, used for finding and automatically linking required bitcode libraries.
-Rpass-analysis=<value> Report transformation analysis from optimization passes whose name matches the
given POSIX regular expression
-Rpass-missed=<value>
Report missed transformations by optimization passes whose name matches the given POSIX regular
expression
-Rpass=<value>
Report transformations performed by optimization passes whose name matches the given POSIX regular
expression
-rtlib=<value>
Compiler runtime library to use
-R<remark>
Enable the specified remark
-save-stats=<value>
Save llvm statistics.
-save-stats
Save llvm statistics.
-save-temps=<value>
Save intermediate compilation results.
-save-temps
Save intermediate compilation results
-serialize-diagnostics <value>
Serialize compiler diagnostics to a file
-shared-libsan
Dynamically link the sanitizer runtime
--start-no-unused-arguments
Don't emit warnings about unused arguments for the following arguments
-static-libsan
Statically link the sanitizer runtime (Not supported for ASan, TSan or UBSan on darwin)
-static-openmp
Use the static host OpenMP runtime while linking.
-std=<value>
Language standard to compile for
-stdlib++-isystem <directory>
Use directory as the C++ standard library include path
-stdlib=<value>
C++ standard library to use
-sycl-std=<value>
SYCL language standard to compile for.
--system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as including a system header.
-S Only run preprocess and compilation steps
--target=<value>
Generate code for the given target
-time Time individual commands
-traditional-cpp
Enable some traditional CPP emulation
-trigraphs
Process trigraph sequences
-T <script>
Specify <script> as linker script
-undef undef all system defines
-unwindlib=<value>
Unwind library to use
-U <macro>
Undefine macro <macro>
--verify-debug-info
Verify the binary representation of debug output
-verify-pch
Load and verify that a pre-compiled header file is not stale
--version
Print version information
-vfsoverlay <value>
Overlay the virtual filesystem described by file over the real file system. Additionally, pass
this overlay file to the linker if it supports it
-v Show commands to run and use verbose output
-Wa,<arg>
Pass the comma separated arguments in <arg> to the assembler
-Wdeprecated
Enable warnings for deprecated constructs and define __DEPRECATED
-Wl,<arg>
Pass the comma separated arguments in <arg> to the linker
-working-directory <value>
Resolve file paths relative to the specified directory
-Wp,<arg>
Pass the comma separated arguments in <arg> to the preprocessor
-W<warning>
Enable the specified warning
-w Suppress all warnings
-Xanalyzer <arg>
Pass <arg> to the static analyzer
-Xarch_device <arg>
Pass <arg> to the CUDA/HIP device compilation
-Xarch_host <arg>
Pass <arg> to the CUDA/HIP host compilation
-Xassembler <arg>
Pass <arg> to the assembler
-Xclang=<arg>
Alias for -Xclang
-Xclang <arg>
Pass <arg> to clang -cc1
-Xcuda-fatbinary <arg>
Pass <arg> to fatbinary invocation
-Xcuda-ptxas <arg>
Pass <arg> to the ptxas assembler
-Xlinker <arg>
Pass <arg> to the linker
-Xoffload-linker<triple> <arg>
Pass <arg> to the offload linkers or the ones idenfied by -<triple>
-Xopenmp-target=<triple> <arg>
Pass <arg> to the target offloading toolchain identified by <triple>.
-Xopenmp-target <arg>
Pass <arg> to the target offloading toolchain.
-Xpreprocessor <arg>
Pass <arg> to the preprocessor
-x <language>
Treat subsequent input files as having type <language>
-z <arg>
Pass -z <arg> to the linker
CastXML project maintained and supported by Kitware (kitware.com).
Ubuntu clang version 17.0.6 (5build1) Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir:
castxml version 0.6.3 April 2024 CASTXML(1)