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