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docs/yaml/objects/compiler.yaml
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Ludovic Rousseau
Documentation: remove duplicated text
17 май 2026, 16:55
17 май 2026, 16:55
cff370d
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name: compiler long_name: Compiler object description: | This object is returned by [[meson.get_compiler]]. It represents a compiler for a given language and allows you to query its properties. notes: - | These compiler checks do not use compiler arguments added with `add_*_arguments()`, via `-Dlang_args` on the command-line, or through `CFLAGS`/`LDFLAGS`, etc in the environment. Hence, you can trust that the tests will be fully self-contained, and won't fail because of custom flags added by other parts of the build file or by users. - | Note that if you have a single prefix with all your dependencies, you might find it easier to append to the environment variables `C_INCLUDE_PATH` with GCC/Clang and `INCLUDE` with MSVC to expand the default include path, and `LIBRARY_PATH` with GCC/Clang and `LIB` with MSVC to expand the default library search path. However, with GCC, these variables will be ignored when cross-compiling. In that case you need to use a specs file. See: http://www.mingw.org/wiki/SpecsFileHOWTO methods: # Helper methods to pre-define common posargs - name: _code returns: void description: You have found a bug if you can see this! posargs: code: type: str | file description: | The source code to check. If a string is passed, the code is used directly. If a [[@file]] object is passed, its content is used for the compiler check. # Helper methods to pre-define common kwargs - name: _args returns: void description: You have found a bug if you can see this! kwargs: args: type: array[str] description: | Used to pass an array of compiler arguments. Defining include paths for headers not in the default include path via `-Isome/path/to/header` is generally supported, however, usually not recommended. This is because include directories can also be specified via the `include_directories` or the `dependency` kwarg (if present). The same is also true for passing libraries to link with `-lfoo`. - name: _include_directories returns: void description: You have found a bug if you can see this! kwargs: include_directories: type: array[inc | str] since: 0.38.0 description: | Extra directories for header searches, created with the [[include_directories]] function. *(Since 1.10.0)* Strings are also accepted. - name: _dependencies returns: void description: You have found a bug if you can see this! kwargs: dependencies: type: dep | array[dep] description: Additionally dependencies required for compiling and / or linking. - name: _prefix returns: void description: You have found a bug if you can see this! kwargs: prefix: type: str | array[str] description: | Used to add `#include`s and other things that are required for the symbol to be declared. Since 1.0.0 an array is accepted too. When an array is passed, the items are concatenated together separated by a newline. System definitions should be passed via compiler args (eg: `_GNU_SOURCE` is often required for some symbols to be exposed on Linux, and it should be passed via `args` keyword argument). - name: _no_builtin_args returns: void description: You have found a bug if you can see this! kwargs: no_builtin_args: type: bool default: false description: When set to `true`, the compiler arguments controlled by built-in configuration options are not added. - name: _name returns: void description: You have found a bug if you can see this! kwargs: name: type: str description: | The name to use for printing a message about the compiler check. If this keyword argument is not passed, no message will be printed about the check. # Even more convenient - name: _common returns: void description: You have found a bug if you can see this! kwargs_inherit: - compiler._args - compiler._include_directories - compiler._dependencies - compiler._no_builtin_args - compiler._prefix - name: _compiles returns: void description: You have found a bug if you can see this! kwargs: required: type: bool | feature default: false since: 1.5.0 description: When set to `true`, Meson will halt if the check fails. When set to a [`feature`](Build-options.md#features) option, the feature will control if it is searched and whether to fail if not found. kwargs_inherit: - compiler._args - compiler._include_directories - compiler._dependencies - compiler._no_builtin_args - compiler._name - compiler._werror - name: _header returns: void description: You have found a bug if you can see this! kwargs_inherit: compiler._common kwargs: required: type: bool | feature default: false since: 0.50.0 description: When set to `true`, Meson will halt if the header check fails. When set to a [`feature`](Build-options.md#features) option, the feature will control if it is searched and whether to fail if not found. - name: _required returns: void description: You have found a bug if you can see this! kwargs: required: type: bool | feature default: false since: 1.3.0 description: When set to `true`, Meson will halt if the check fails. When set to a [`feature`](Build-options.md#features) option, the feature will control if it is searched and whether to fail if not found. - name: _werror returns: void description: You have found a bug if you can see this! kwargs: werror: type: bool default: false description: When set to `true`, compiler warnings are treated as error. since: 1.3.0 # Star of the actual functions - name: version returns: str description: Returns the compiler's version number as a string. - name: cmd_array returns: array[str] description: Returns an array containing the command(s) for the compiler. - name: alignment returns: int description: | Returns the alignment of the specified type. For C-like languages, the headers `stddef.h` and `stdio.h` are included implicitly for native compilation, only `stddef.h` is included when cross-compiling. posargs: typename: type: str description: The name of the type to check. kwargs_inherit: - compiler._args - compiler._prefix - compiler._dependencies # TODO: why not also allow passing `include_directories`? - name: run returns: runresult description: Attempts to compile and execute the given code fragment. posargs_inherit: compiler._code kwargs_inherit: compiler._compiles - name: get_id returns: str description: | Returns a string identifying the compiler. For example, `gcc`, `msvc`, [and more](Reference-tables.md#compiler-ids). - name: get_linker_id returns: str since: 0.53.0 description: | Returns a string identifying the linker. For example, `ld.bfd`, `link`, [and more](Reference-tables.md#linker-ids). - name: symbols_have_underscore_prefix returns: bool since: 0.37.0 description: Returns `true` if the C symbol mangling is one underscore (`_`) prefixed to the symbol. - name: has_member returns: bool description: Returns true if the type has the specified member. kwargs_inherit: - compiler._common - compiler._required posargs: typename: type: str description: The type to check. membername: type: str description: The member to check. - name: has_members returns: bool description: Returns `true` if the type has *all* the specified members. kwargs_inherit: - compiler._common - compiler._required posargs: typename: type: str description: The type to check. varargs: name: member type: str min_varargs: 1 description: The members to check - name: has_function returns: bool description: | Returns true if the given function is provided by the standard library or a library passed in with the `args` keyword. kwargs_inherit: - compiler._common - compiler._required posargs: funcname: type: str description: The function to check. - name: has_type returns: bool description: Returns `true` if the specified token is a type. kwargs_inherit: - compiler._common - compiler._required posargs: typename: type: str description: The type to check. - name: compute_int returns: int since: 0.40.0 kwargs_inherit: compiler._common description: | Computes the value of the given expression (as an example `1 + 2`). When cross compiling this is evaluated with an iterative algorithm, you can specify keyword arguments `low` (defaults to -1024), `high` (defaults to 1024) and `guess` to specify max and min values for the search and the value to try first. For C-like languages, the header `stddef.h` and `stdio.h` are included implicitly for native compilation, only `stddef.h` is included when cross-compiling. posargs: expr: type: str description: The expression to compute. kwargs: low: type: int default: -1024 description: The min value. high: type: int default: 1024 description: The max value. guess: type: int description: The value to try first. - name: sizeof returns: int description: | returns the size of the given type (e.g. `'int'`) or -1 if the type is unknown. For C-like languages, the header `stddef.h` and `stdio.h` are included implicitly for native compilation, only `stddef.h` is included when cross-compiling. kwargs_inherit: compiler._common posargs: typename: type: str description: The type to compute. - name: get_define returns: str since: 0.40.0 description: | Returns the given preprocessor symbol's value as a string or empty string if it is not defined. *(since 0.47.0)* This method will concatenate string literals as the compiler would. E.g. `"a" "b"` will become `"ab"`. kwargs_inherit: compiler._common posargs: definename: type: str description: The define to check. - name: has_define returns: bool since: 1.3.0 description: | Returns true if the given preprocessor symbol is *defined*. kwargs_inherit: compiler._common posargs: definename: type: str description: The define to check. - name: compiles returns: bool description: Returns true if the code compiles. posargs_inherit: compiler._code kwargs_inherit: compiler._compiles - name: links returns: bool description: | Returns true if the code compiles and links. *Since 0.60.0*, if the `file` object's suffix does not match the compiler object's language, the compiler corresponding to the suffix is used to compile the source, while the target of the `links` method is used to link the resulting object file. posargs_inherit: compiler._code kwargs_inherit: compiler._compiles - name: check_header returns: bool since: 0.47.0 description: | Returns true if the specified header is *usable* with the specified prefix, dependencies, and arguments. kwargs_inherit: compiler._header posargs: header_name: type: str description: The header to check. - name: has_header returns: bool description: | Returns true if the specified header is *exists* with the specified prefix, dependencies, and arguments. This method is faster than [[compiler.check_header]] since it only does a pre-processor check. kwargs_inherit: compiler._header posargs_inherit: compiler.check_header - name: has_header_symbol returns: bool description: | Detects whether a particular symbol is declared in the specified header. Symbols here include function, variable, `#define`, type definition, etc. kwargs_inherit: compiler._header posargs: header: type: str description: The header to check. symbol: type: str description: The symbol to check. - name: find_library returns: dep description: Tries to find the library specified in the positional argument. posargs: libname: type: str description: The library to find. kwargs: required: type: bool | feature default: true description: | If set `true`, Meson will abort with an error if the library could not be found. Otherwise, Meson will continue and the found method of the returned object will return `false`. When set to a [`feature`](Build-options.md#features) option, the feature will control if it is searched and whether to fail if not found. *(since 0.47.0)* The value of a `feature` option can also be passed here. has_headers: type: array[str] since: 0.50.0 description: | An array of headers that must be found as well. This check is equivalent to checking each header with a [[compiler.has_header]] call. When used, kwargs that [[compiler.has_header]] would accept can be passed here prefixed with `header_`, and will have the same effect on the header check. static: type: bool default: false since: 0.51.0 description: | If `true`, the search is limited to static libraries only. Setting this value to `false` (the default) will search for both shared *and* static libraries. disabler: type: bool default: false since: 0.49.0 description: If `true`, this method will return a [[@disabler]] on a failed check. dirs: type: array[str] description: | Additional directories to search in. By default the library is searched for in the system library directory (e.g. /usr/lib). Specifying more directories here, causes Meson to search in those directories as well as the system directories. # does not work, since all _common kwargs need to be prefixed `header_` here # kwargs_inherit: compiler._common header_args: type: array[str] since: 0.51.0 description: | When the `has_headers` kwarg is also used, this argument is passed to [[compiler.has_header]] as `args`. header_include_directories: type: array[inc | str] since: 0.51.0 description: | When the `has_headers` kwarg is also used, this argument is passed to [[compiler.has_header]] as `include_directories`. *(Since 1.10.0)* Strings are also accepted. header_dependencies: type: dep | array[dep] since: 0.51.0 description: | When the `has_headers` kwarg is also used, this argument is passed to [[compiler.has_header]] as `dependencies`. header_no_builtin_args: type: bool default: false since: 0.51.0 description: | When the `has_headers` kwarg is also used, this argument is passed to [[compiler.has_header]] as `no_builtin_args`. header_prefix: type: str since: 0.51.0 description: | When the `has_headers` kwarg is also used, this argument is passed to [[compiler.has_header]] as `prefix`. # Compiler arguments - name: has_argument returns: bool description: | Returns `true` if the compiler accepts the specified command line argument, that is, can compile code without erroring out or printing a warning about an unknown flag. posargs: argument: type: str description: The argument to check. kwargs_inherit: - compiler._required - name: has_multi_arguments since: 0.37.0 returns: bool description: | the same as [[compiler.has_argument]] but takes multiple arguments and uses them all in a single compiler invocation. varargs: name: arg type: str description: The arguments to check. kwargs_inherit: - compiler._required - name: get_supported_arguments returns: array[str] since: 0.43.0 varargs_inherit: compiler.has_multi_arguments description: | Returns an array containing only the arguments supported by the compiler, as if [[compiler.has_argument]] were called on them individually. kwargs: checked: type: str since: 0.59.0 default: "'off'" description: | Supported values: - `'off'`: Quietly ignore unsupported arguments - `'warn'`: Print a warning for unsupported arguments - `'require'`: Abort if at least one argument is not supported - name: first_supported_argument returns: array[str] since: 0.43.0 varargs_inherit: compiler.has_multi_arguments description: | Given an array of strings, returns a single-element array containing the first argument that passes the [[compiler.has_argument]] test or an empty array if none pass. # Linker arguments - name: has_link_argument since: 0.46.0 returns: bool description: | Returns `true` if the linker accepts the specified command line argument, that is, can compile and link code without erroring out or printing a warning about an unknown flag. Link arguments will be passed to the compiler, so should usually have the `-Wl,` prefix. On VisualStudio a `/link` argument will be prepended. posargs: argument: type: str description: The argument to check. kwargs_inherit: - compiler._required - name: has_multi_link_arguments since: 0.46.0 returns: bool description: | the same as [[compiler.has_link_argument]] but takes multiple arguments and uses them all in a single compiler invocation. varargs: name: arg type: str description: The link arguments to check. kwargs_inherit: - compiler._required - name: get_supported_link_arguments returns: array[str] since: 0.46.0 varargs_inherit: compiler.has_multi_link_arguments description: | Returns an array containing only the arguments supported by the compiler, as if [[compiler.has_link_argument]] were called on them individually. # TODO: why is this not present here? # kwargs: # checked: # type: str # since: 0.59.0 # default: "'off'" # description: | # Supported values: # - `'off'`: Quietly ignore unsupported arguments # - `'warn'`: Print a warning for unsupported arguments # - `'require'`: Abort if at least one argument is not supported - name: first_supported_link_argument returns: array[str] since: 0.46.0 varargs_inherit: compiler.has_multi_link_arguments description: | Given an array of strings, returns the first argument that passes the [[compiler.has_link_argument]] test or an empty array if none pass. - name: has_function_attribute returns: bool since: 0.48.0 description: | Returns `true` if the compiler supports the GNU style (`__attribute__(...)`) `name`. This is preferable to manual compile checks as it may be optimized for compilers that do not support such attributes. [This table](Reference-tables.md#gcc-__attribute__) lists all of the supported attributes. posargs: name: type: str description: The attribute name to check. kwargs_inherit: - compiler._required - name: get_supported_function_attributes returns: array[str] since: 0.48.0 description: | Returns an array containing any names that are supported GCC style attributes. Equivalent to [[compiler.has_function_attribute]] was called on each of them individually. # TODO: Again why doesn't this function have the checked kwarg? - name: get_argument_syntax returns: str since: 0.49.0 description: | returns a string identifying the type of arguments the compiler takes. Can be one of `gcc`, `msvc`, or an undefined string value. This method is useful for identifying compilers that are not gcc or msvc, but use the same argument syntax as one of those two compilers such as clang or icc, especially when they use different syntax on different operating systems. - name: preprocess returns: array[custom_idx] since: 0.64.0 description: | Preprocess an array of source files but do not compile them. The preprocessor will receive the same arguments (include directories, defines, etc) as with normal compilation. That includes for example args added with `add_project_arguments()`, or on the command line with `-Dc_args=-DFOO`. varargs: name: source type: str | file | custom_tgt | custom_idx | generated_list description: | Input source to preprocess. The following types are supported: - Strings relative to the current source directory - [[@file]] objects defined in any preceding build file - The return value of configure-time generators such as [[configure_file]] - The return value of build-time generators such as [[custom_target]] or [[generator.process]] kwargs_inherit: - compiler._include_directories kwargs: output: type: str description: | Template for name of preprocessed files: `@PLAINNAME@` is replaced by the source filename and `@BASENAME@` is replaced by the source filename without its extension. compile_args: type: array[str] description: | Extra flags to pass to the preprocessor dependencies: type: dep | array[dep] description: Additionally dependencies required. since: 1.1.0 depends: type: array[build_tgt | custom_tgt] description: | Specifies that this target depends on the specified target(s). These targets should be built before starting to preprocess an input. since: 1.4.0