mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-15 06:14:57 +01:00
55 lines
2.1 KiB
Markdown
55 lines
2.1 KiB
Markdown
# pkg-config {#sec-pkg-config}
|
|
|
|
*pkg-config* is a unified interface for declaring and querying built C/C++ libraries.
|
|
|
|
Nixpkgs provides a couple of facilities for working with this tool.
|
|
|
|
## Writing packages providing pkg-config modules {#pkg-config-writing-packages}
|
|
|
|
Packages should set `meta.pkgConfigModules` with the list of package config modules they provide.
|
|
They should also use `testers.hasPkgConfigModules` to check that the final built package matches that list,
|
|
and optionally check that the pkgconf modules' version metadata matches the derivation's.
|
|
Additionally, the [`validatePkgConfig` setup hook](https://nixos.org/manual/nixpkgs/stable/#validatepkgconfig), will do extra checks on to-be-installed pkg-config modules.
|
|
|
|
A good example of all these things is miniz:
|
|
|
|
```nix
|
|
{ pkg-config, testers, ... }:
|
|
|
|
stdenv.mkDerivation (finalAttrs: {
|
|
/* ... */
|
|
|
|
nativeBuildInputs = [ pkg-config validatePkgConfig ];
|
|
|
|
passthru.tests.pkg-config = testers.hasPkgConfigModules {
|
|
package = finalAttrs.finalPackage;
|
|
versionCheck = true;
|
|
};
|
|
|
|
meta = {
|
|
/* ... */
|
|
pkgConfigModules = [ "miniz" ];
|
|
};
|
|
})
|
|
```
|
|
|
|
## Accessing packages via pkg-config module name {#sec-pkg-config-usage}
|
|
|
|
### Within Nixpkgs {#sec-pkg-config-usage-internal}
|
|
|
|
A [setup hook](#setup-hook-pkg-config) is bundled in the `pkg-config` package to bring a derivation's declared build inputs into the environment.
|
|
This will populate environment variables like `PKG_CONFIG_PATH`, `PKG_CONFIG_PATH_FOR_BUILD`, and `PKG_CONFIG_PATH_HOST` based on:
|
|
|
|
- how `pkg-config` itself is depended upon
|
|
|
|
- how other dependencies are depended upon
|
|
|
|
For more details see the section on [specifying dependencies in general](#ssec-stdenv-dependencies).
|
|
|
|
Normal pkg-config commands to look up dependencies by name will then work with those environment variables defined by the hook.
|
|
|
|
### Externally {#sec-pkg-config-usage-external}
|
|
|
|
The `defaultPkgConfigPackages` package set is a set of aliases, named after the modules they provide.
|
|
This is meant to be used by language-to-nix integrations.
|
|
Hand-written packages should use the normal Nixpkgs attribute name instead.
|