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