dependencies/pkgconfig: Canonicalize libpaths

Prefix library paths specified by -L are converted to canonical paths
to improve the library runpath stored in the binary output.
For example, if `pkg-config --libs add` returns the following:

    -L/usr/local/lib/pkgconfig/../../lib -ladd

we convert the path so that it is as if it had returned:

    -L/usr/local/lib -ladd

Author: hpkfft

mesonbuild/dependencies/pkgconfig.py

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# Copyright 2013-2021 The Meson development team
+# Copyright 2013-2025 The Meson development team
 
 from __future__ import annotations
 
@@ -423,11 +423,11 @@ def _search_libs(self, libs_in: ImmutableListProtocol[str], raw_libs_in: Immutab
                 if not os.path.isabs(path):
                     # Resolve the path as a compiler in the build directory would
                     path = os.path.join(self.env.get_build_dir(), path)
-                prefix_libpaths.add(path)
+                prefix_libpaths.add(Path(path).resolve().as_posix())
         # Library paths are not always ordered in a meaningful way
         #
         # Instead of relying on pkg-config or pkgconf to provide -L flags in a
-        # specific order, we reorder library paths ourselves, according to th
+        # specific order, we reorder library paths ourselves, according to the
         # order specified in PKG_CONFIG_PATH. See:
         # https://github.com/mesonbuild/meson/issues/4271
         #

unittests/allplatformstests.py

@@ -2159,7 +2159,7 @@ def test_pkgconfig_gen_escaping(self):
         kwargs = {'required': True, 'silent': True}
         foo_dep = PkgConfigDependency('libanswer', env, kwargs)
         # Ensure link_args are properly quoted
-        libdir = PurePath(prefix) / PurePath(libdir)
+        libdir = Path(prefix, libdir).resolve()
         link_args = ['-L' + libdir.as_posix(), '-lanswer']
         self.assertEqual(foo_dep.get_link_args(), link_args)
         # Ensure include args are properly quoted

unittests/internaltests.py

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# Copyright 2016-2021 The Meson development team
+# Copyright 2016-2025 The Meson development team
 
 from configparser import ConfigParser
 from pathlib import Path
@@ -669,6 +669,8 @@ def _call_pkgbin(self, args, env=None):
                 instance_method.return_value = FakeInstance(env, MachineChoice.HOST, silent=True)
                 kwargs = {'required': True, 'silent': True}
                 foo_dep = PkgConfigDependency('foo', env, kwargs)
+                p1 = p1.resolve()
+                p2 = p2.resolve()
                 self.assertEqual(foo_dep.get_link_args(),
                                  [(p1 / 'libfoo.a').as_posix(), (p2 / 'libbar.a').as_posix()])
                 bar_dep = PkgConfigDependency('bar', env, kwargs)

unittests/linuxliketests.py

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# Copyright 2016-2022 The Meson development team
+# Copyright 2016-2025 The Meson development team
 
 import stat
 import subprocess
@@ -1150,7 +1150,7 @@ def test_pkgconfig_relative_paths(self):
         self.assertTrue(relative_path_dep.found())
 
         # Ensure link_args are properly quoted
-        libpath = Path(self.builddir) / '../relativepath/lib'
+        libpath = Path(self.builddir).parent / 'relativepath/lib'
         link_args = ['-L' + libpath.as_posix(), '-lrelativepath']
         self.assertEqual(relative_path_dep.get_link_args(), link_args)