Reference tables

Compiler ids

These are return values of the get_id (Compiler family) and get_argument_syntax (Argument syntax) method in a compiler object.

Value	Compiler family	Argument syntax
arm	ARM compiler
armclang	ARMCLANG compiler
ccomp	The CompCert formally-verified C compiler
ccrx	Renesas RX Family C/C++ compiler
clang	The Clang compiler	gcc
clang-cl	The Clang compiler (MSVC compatible driver)	msvc
dmd	D lang reference compiler
emscripten	Emscripten WASM compiler
flang	Classic Flang Fortran compiler
g95	The G95 Fortran compiler
gcc	The GNU Compiler Collection	gcc
intel	Intel compiler (Linux and Mac)	gcc
intel-cl	Intel compiler (Windows)	msvc
intel-llvm	Intel oneAPI LLVM-based compiler
intel-llvm-cl	Intel oneAPI LLVM-based compiler (Windows)	msvc
lcc	Elbrus C/C++/Fortran Compiler
llvm	LLVM-based compiler (Swift, D)
llvm-flang	Flang Fortran compiler (LLVM-based)
mono	Xamarin C# compiler
mwccarm	Metrowerks C/C++ compiler for Embedded ARM
mwcceppc	Metrowerks C/C++ compiler for Embedded PowerPC
msvc	Microsoft Visual Studio	msvc
nagfor	The NAG Fortran compiler
nvidia_hpc	NVidia HPC SDK compilers
nvcc	NVidia CUDA compiler
open64	The Open64 Fortran Compiler
pathscale	The Pathscale Fortran compiler
pgi	Portland PGI C/C++/Fortran compilers
rustc	Rust compiler
sun	Sun Fortran compiler
c2000	Texas Instruments C/C++ Compiler (C2000)
c6000	Texas Instruments C/C++ Compiler (C6000)
ti	Texas Instruments C/C++ Compiler
valac	Vala compiler
xc16	Microchip XC16 C compiler
cython	The Cython compiler
nasm	The NASM compiler (Since 0.64.0)
yasm	The YASM compiler (Since 0.64.0)
ml	Microsoft Macro Assembler for x86 and x86_64 (Since 0.64.0)	msvc
armasm	Microsoft Macro Assembler for ARM and AARCH64 (Since 0.64.0)
mwasmarm	Metrowerks Assembler for Embedded ARM
mwasmeppc	Metrowerks Assembler for Embedded PowerPC

Linker ids

These are return values of the get_linker_id method in a compiler object.

Value	Linker family
ld.bfd	The GNU linker
ld.gold	The GNU gold linker
ld.lld	The LLVM linker, with the GNU interface
ld.mold	The fast MOLD linker
ld.solaris	Solaris and illumos
ld.wasm	emscripten's wasm-ld linker
ld.zigcc	The Zig linker (C/C++ frontend; GNU-like)
ld64	Apple ld64
ld64.lld	The LLVM linker, with the ld64 interface
link	MSVC linker
lld-link	The LLVM linker, with the MSVC interface
xilink	Used with Intel-cl only, MSVC like
optlink	optlink (used with DMD)
rlink	The Renesas linker, used with CCrx only
xc16-ar	The Microchip linker, used with XC16 only
ar2000	The Texas Instruments linker, used with C2000 only
ti-ar	The Texas Instruments linker
ar6000	The Texas Instruments linker, used with C6000 only
armlink	The ARM linker (arm and armclang compilers)
pgi	Portland/Nvidia PGI
nvlink	Nvidia Linker used with cuda
ccomp	CompCert used as the linker driver
mwldarm	The Metrowerks Linker with the ARM interface, used with mwccarm only
mwldeppc	The Metrowerks Linker with the PowerPC interface, used with mwcceppc only

For languages that don't have separate dynamic linkers such as C# and Java, the get_linker_id will return the compiler name.

Script environment variables

Value	Comment
MESONINTROSPECT	Command to run to run the introspection command, may be of the form python /path/to/meson introspect, user is responsible for splitting the path if necessary.
MESONREWRITE	Command to run to run the rewriting command, only set when running dist scripts
MESON_BUILD_ROOT	Absolute path to the build dir
MESON_DIST_ROOT	Points to the root of the staging directory, only set when running dist scripts
MESON_SOURCE_ROOT	Absolute path to the source dir
MESON_SUBDIR	Current subdirectory, only set for run_command

CPU families

These are returned by the cpu_family method of build_machine, host_machine and target_machine. For cross compilation they are set in the cross file.

Value	Comment
aarch64	64 bit ARM processor
alpha	DEC Alpha processor
arc	32 bit ARC processor
arm	32 bit ARM processor
avr	Atmel AVR processor
c2000	32 bit C2000 processor
c6000	32 bit C6000 processor
csky	32 bit CSky processor
dspic	16 bit Microchip dsPIC
e2k	MCST Elbrus processor
ft32	32 bit Bridgetek MCU
ia64	Itanium processor
loongarch64	64 bit Loongson processor
m68k	Motorola 68000 processor
microblaze	MicroBlaze processor
mips	32 bit MIPS processor
mips64	64 bit MIPS processor
msp430	16 bit MSP430 processor
parisc	HP PA-RISC processor
pic24	16 bit Microchip PIC24
ppc	32 bit PPC processors
ppc64	64 bit PPC processors
riscv32	32 bit RISC-V Open ISA
riscv64	64 bit RISC-V Open ISA
rl78	Renesas RL78
rx	Renesas RX 32 bit MCU
s390	IBM zSystem s390
s390x	IBM zSystem s390x
sh4	SuperH SH-4
sparc	32 bit SPARC
sparc64	SPARC v9 processor
sw_64	64 bit sunway processor
wasm32	32 bit Webassembly
wasm64	64 bit Webassembly
x86	32 bit x86 processor
x86_64	64 bit x86 processor

Any cpu family not listed in the above list is not guaranteed to remain stable in future releases.

Those porting from autotools should note that Meson does not add endianness to the name of the cpu_family. For example, autotools will call little endian PPC64 "ppc64le", Meson will not, you must also check the .endian() value of the machine for this information.

Operating system names

These are provided by the .system() method call.

Value	Comment
android	By convention only, subject to change
cygwin	Cygwin or MSYS2 environment on Windows
darwin	Either OSX or iOS
dragonfly	DragonFly BSD
emscripten	Emscripten's JavaScript environment
freebsd	FreeBSD and its derivatives
gnu	GNU Hurd
haiku
linux
netbsd
openbsd
windows	Native Windows (not Cygwin or MSYS2)
sunos	illumos and Solaris

Any string not listed above is not guaranteed to remain stable in future releases.

Kernel names (since 1.2.0)

Native names as returned by the .kernel() method.

Value	Comment
linux
freebsd
openbsd
netbsd
gnu	GNU Hurd
nt
xnu	Kernel of various Apple OSes
illumos	Kernel derived from OpenSolaris by community efforts
solaris	Kernel derived from OpenSolaris by Oracle
dragonfly
haiku
none	For e.g. bare metal embedded

Subsystem names (since 1.2.0)

A more specific description of the system in question. Most values are meant to be used in cross files only, as those platforms can not run Meson natively.

Value	Comment
macos	Apple macOS (formerly OSX)
ios	Apple iOS
ios-simulator
tvos	Apple tvOS
tvos-simulator
watchos	Apple watchOS
watchos-simulator

Language arguments parameter names

These are the parameter names for passing language specific arguments to your build target.

Language	compiler name	linker name
C	c_args	c_link_args
C++	cpp_args	cpp_link_args
C#	cs_args	cs_link_args
CUDA	cuda_args	cuda_link_args
D	d_args	d_link_args
Fortran	fortran_args	fortran_link_args
Java	java_args	java_link_args
Objective C	objc_args	objc_link_args
Objective C++	objcpp_args	objcpp_link_args
Rust	rust_args	rust_link_args
Vala	vala_args	vala_link_args
Cython	cython_args	cython_link_args
NASM	nasm_args	N/A
MASM	masm_args	N/A

All these <lang>_* options are specified per machine. See in specifying options per machine for on how to do this in cross builds.

Compiler and linker flag environment variables

These environment variables will be used to modify the compiler and linker flags.

It is recommended that you do not use these. They are provided purely to for backwards compatibility with other build systems. There are many caveats to their use, especially when rebuilding the project. It is highly recommended that you use the command line arguments instead.

Name	Comment
CFLAGS	Flags for the C compiler
CXXFLAGS	Flags for the C++ compiler
CUFLAGS	Flags for the CUDA compiler
OBJCFLAGS	Flags for the Objective C compiler
FFLAGS	Flags for the Fortran compiler
DFLAGS	Flags for the D compiler
VALAFLAGS	Flags for the Vala compiler
RUSTFLAGS	Flags for the Rust compiler
CYTHONFLAGS	Flags for the Cython compiler
LDFLAGS	The linker flags, used for all languages

N.B. these settings are specified per machine, and so the environment variables actually come in pairs. See the environment variables per machine section for details.

Function Attributes

These are the parameters names that are supported using compiler.has_function_attribute() or compiler.get_supported_function_attributes()

GCC __attribute__

These values are supported using the GCC style __attribute__ annotations, which are supported by GCC, Clang, and other compilers.

Name
alias
aligned
alloc_size
always_inline
artificial
cold
const
constructor
constructor_priority
deprecated
destructor
error
externally_visible
fallthrough
flatten
format
format_arg
force_align_arg_pointer³
gnu_inline
hot
ifunc
malloc
noclone
noinline
nonnull
noreturn
nothrow
null_terminated_string_arg⁷
optimize
packed
pure
retain⁴
returns_nonnull
section⁵
sentinel⁵
unused
used
vector_size⁶
visibility*
visibility:default†
visibility:hidden†
visibility:internal†
visibility:protected†
warning
warn_unused_result
weak
weakref

* Changed in 0.52.0 the "visibility" target no longer includes "protected", which is not present in Apple's clang.

† New in 0.52.0 These split visibility attributes are preferred to the plain "visibility" as they provide narrower checks.

³ New in 0.55.0

⁴ New in 0.62.0

⁵ New in 0.63.0

⁶ New in 1.1.0

⁷ New in 1.5.0

MSVC __declspec

These values are supported using the MSVC style __declspec annotation, which are supported by MSVC, GCC, Clang, and other compilers.

Name
dllexport
dllimport

Dependency lookup methods

These are the values that can be passed to dependency function's method keyword argument.

Name	Comment
auto	Automatic method selection
pkg-config	Use Pkg-Config
cmake	Look up as a CMake module
config-tool	Use a custom dep tool such as cups-config
system	System provided (e.g. OpenGL)
extraframework	A macOS/iOS framework

Compiler and Linker selection variables

N.B. these settings are specified per machine, and so the environment variables actually come in pairs. See the environment variables per machine section for details.

Language	Compiler	Linker	Note
C	CC	CC_LD
C++	CXX	CXX_LD
D	DC	DC_LD	Before 0.54 D_LD*
Fortran	FC	FC_LD	Before 0.54 F_LD*
Objective-C	OBJC	OBJC_LD
Objective-C++	OBJCXX	OBJCXX_LD	Before 0.54 OBJCPP_LD*
Rust	RUSTC	RUSTC_LD	Before 0.54 RUST_LD*
Vala	VALAC		Use CC_LD. Vala transpiles to C
C#	CSC	CSC	The linker is the compiler
Cython	CYTHON
nasm	NASM		Uses the C linker
archiver		AR

*The old environment variables are still supported, but are deprecated and will be removed in a future version of Meson.

changed in 1.3.0 Paths with spaces were split unconditionally to extract components such as the path to Ccache, intrinsic compiler flags like -m32 or --target, etc. This broke passing a hardcoded compiler path to CMake subprojects. To work around this, paths must be wrapped with double quotes:

export CC='"C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe"'

You can also set the values through machine files.

New in 1.3.0 Paths that point to an existing executable no longer need wrapping:

export CC='C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe'

Environment variables per machine

Since 0.54.0, Following Autotool and other legacy build systems, environment variables that affect machine-specific settings come in pairs: for every bare environment variable FOO, there is a suffixed FOO_FOR_BUILD, where FOO just affects the host machine configuration, while FOO_FOR_BUILD just affects the build machine configuration. For example:

• PKG_CONFIG_PATH_FOR_BUILD controls the paths pkg-config will search for just native: true dependencies (build machine).

• PKG_CONFIG_PATH controls the paths pkg-config will search for just native: false dependencies (host machine).

This mirrors the build. prefix used for (built-in) Meson options, which has the same meaning.

This is useful for cross builds. In the native builds, build = host, and the unsuffixed environment variables alone will suffice.

Prior to 0.54.0, there was no _FOR_BUILD-suffixed variables, and most environment variables only effected native machine configurations, though this wasn't consistent (e.g. PKG_CONFIG_PATH still affected cross builds).