PkgConfigDependency: Parse library paths in a separate step

pkg-config and pkgconf treat additional search paths in
PKG_CONFIG_PATH and PKG_CONFIG_LIBDIR differently when
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 is set.

pkg-config always outputs -L flags for the additional paths first, and
pkgconf always outputs -L flags for the default paths first.

To account for this inconsistency, we now sort the library paths into
two separate sets: system (default) and prefix (additional) paths. We
can do this because we always query pkg-config twice: once with
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 set and once without it.

Then, we ensure that the prefix paths are searched before the system
paths.

Closes https://github.com/mesonbuild/meson/issues/4023
Closes https://github.com/mesonbuild/meson/issues/3951

1 files changed, 1 insertions, 1 deletions

diff --git a/run_unittests.py b/run_unittests.py
index 2e29af7..262bf7b 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -630,7 +630,7 @@ class InternalTests(unittest.TestCase):
                 if '--libs' not in args:
                     return 0, ''
                 if args[0] == 'foo':
-                    return 0, '-L{} -lfoo -L{} -lbar'.format(p1.as_posix(), p2.as_posix())
+                    return 0, '-L{} -lfoo -L{} -lbar'.format(p2.as_posix(), p1.as_posix())
                 if args[0] == 'bar':
                     return 0, '-L{} -lbar'.format(p2.as_posix())
                 if args[0] == 'internal':