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127 lines
7.0 KiB
127 lines
7.0 KiB
# Pkgconfig module |
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This module is a simple generator for |
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[pkg-config](https://pkg-config.freedesktop.org/) files. |
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## Usage |
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```meson |
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pkg = import('pkgconfig') |
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bar_dep = dependency('bar') |
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lib = library('foo', dependencies : [bar]) |
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pkg.generate(lib) |
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``` |
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### pkg.generate() |
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The generated file's properties are specified with the following |
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keyword arguments. |
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- `description` a string describing the library, used to set the `Description:` field |
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- `extra_cflags` a list of extra compiler flags to be added to the |
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`Cflags` field after the header search path |
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- `filebase` the base name to use for the pkg-config file; as an |
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example, the value of `libfoo` would produce a pkg-config file called |
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`libfoo.pc` |
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- `install_dir` the directory to install to, defaults to the value of |
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option `libdir` followed by `/pkgconfig` |
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- `libraries` a list of built libraries (usually results of |
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shared_library) that the user needs to link against. Arbitrary strings can |
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also be provided and they will be added into the `Libs` field. Since 0.45.0 |
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dependencies of built libraries will be automatically added, see the |
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[Implicit dependencies](#implicit-dependencies) section below for the exact |
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rules. Since 0.58.0 custom_target() objects are supported as long as they are |
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linkable (has known extension such as `.a`, `.so`, etc). |
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- `libraries_private` list of built libraries or strings to put in the |
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`Libs.private` field. Since 0.45.0 dependencies of built libraries will be |
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automatically added, see the [Implicit dependencies](#implicit-dependencies) |
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section below for the exact rules. Since 0.58.0 custom_target() objects are |
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supported as long as they are linkable (has known extension such as `.a`, |
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`.so`, etc). |
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- `name` the name of this library, used to set the `Name:` field |
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- `subdirs` which subdirs of `include` should be added to the header |
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search path, for example if you install headers into |
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`${PREFIX}/include/foobar-1`, the correct value for this argument |
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would be `foobar-1` |
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- `requires` list of strings, pkgconfig-dependencies or libraries that |
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`pkgconfig.generate()` was used on to put in the `Requires` field |
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- `requires_private` same as `requires` but for `Requires.private` field |
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field |
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- `url` a string with a url for the library |
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- `variables` a list of strings with custom variables to add to the |
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generated file. The strings must be in the form `name=value` and may |
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reference other pkgconfig variables, |
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e.g. `datadir=${prefix}/share`. The names `prefix`, `libdir` and |
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`includedir` are reserved and may not be used. *Since 0.56.0* it can also be a |
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dictionary but ordering of Meson dictionaries are not guaranteed, which could |
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cause issues when some variables reference other variables. |
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Spaces in values are escaped with `\`, this is required in the case the value is |
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a path that and is used in `cflags` or `libs` arguments. *Since 0.59.0* if |
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escaping is not desired (e.g. space separate list of values) `unescaped_variables` |
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keyword argument should be used instead. |
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- `uninstalled_variables` used instead of the `variables` keyword argument, when |
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generating the uninstalled pkg-config file. Since *0.54.0* |
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Spaces in values are escaped with `\`, this is required in the case the value is |
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a path that and is used in `cflags` or `libs` arguments. *Since 0.59.0* if |
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escaping is not desired (e.g. space separate list of values) |
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`unescaped_uninstalled_variables` keyword argument should be used instead. |
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- `version` a string describing the version of this library, used to set the |
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`Version:` field. (*since 0.46.0*) Defaults to the project version if unspecified. |
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- `d_module_versions` a list of module version flags used when compiling |
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D sources referred to by this pkg-config file |
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- `dataonly` field. (*since 0.54.0*) this is used for architecture-independent |
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pkg-config files in projects which also have architecture-dependent outputs. |
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- `conflicts` (*since 0.36.0, incorrectly issued a warning prior to 0.54.0*) list of strings to be put in the `Conflicts` field. |
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Since 0.46 a `StaticLibrary` or `SharedLibrary` object can optionally |
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be passed as first positional argument. If one is provided a default |
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value will be provided for all required fields of the pc file: |
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- `install_dir` is set to `pkgconfig` folder in the same location than the provided library. |
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- `description` is set to the project's name followed by the library's name. |
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- `name` is set to the library's name. |
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Since 0.54.0 uninstalled pkg-config files are generated as well. They |
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are located in `<build dir>/meson-uninstalled/`. It is sometimes |
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useful to build projects against libraries built by Meson without |
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having to install them into a prefix. In order to do so, just set |
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`PKG_CONFIG_PATH=<builddir>/meson-uninstalled` before building your |
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application. That will cause pkg-config to prefer those |
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`-uninstalled.pc` files and find libraries and headers from the Meson |
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builddir. This is an experimental feature provided on a best-effort |
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basis, it might not work in all use-cases. |
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### Implicit dependencies |
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The exact rules followed to find dependencies that are implicitly |
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added into the pkg-config file have evolved over time. Here are the |
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rules as of Meson *0.49.0*, previous versions might have slightly |
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different behaviour. |
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- Not found libraries or dependencies are ignored. |
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- Libraries and dependencies are private by default (i.e. added into |
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`Requires.private:` or `Libs.private:`) unless they are explicitly added in |
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`libraries` or `requires` keyword arguments, or is the main library (first |
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positional argument). |
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- Libraries and dependencies will be de-duplicated, if they are added in both |
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public and private (e.g `Requires:` and `Requires.private:`) it will be removed |
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from the private list. |
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- Shared libraries (i.e. `shared_library()` and **NOT** `library()`) add only |
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`-lfoo` into `Libs:` or `Libs.private:` but their dependencies are not pulled. |
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This is because dependencies are only needed for static link. |
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- Other libraries (i.e. `static_library()` or `library()`) add `-lfoo` into `Libs:` |
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or `Libs.private:` and recursively add their dependencies into `Libs.private:` or |
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`Requires.private:`. |
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- Dependencies provided by pkg-config are added into `Requires:` or |
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`Requires.private:`. If a version was specified when declaring that dependency |
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it will be written into the generated file too. |
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- The threads dependency (i.e. `dependency('threads')`) adds `-pthread` into |
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`Libs:` or `Libs.private:`. |
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- Internal dependencies (i.e. |
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`declare_dependency(compiler_args : '-DFOO', link_args : '-Wl,something', link_with : foo)`) |
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add `compiler_args` into `Cflags:` if public, `link_args` and `link_with` into |
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`Libs:` if public or `Libs.private:` if private. |
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- Other dependency types add their compiler arguments into `Cflags:` if public, |
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and linker arguments into `Libs:` if public or `Libs.private:` if private. |
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- Once a pkg-config file is generated for a library using `pkg.generate(mylib)`, |
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any subsequent call to `pkg.generate()` where mylib appears, will generate a |
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`Requires:` or `Requires.private` instead of a `Libs:` or `Libs.private:`.
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