gst-uninstalled: set PKG_CONFIG_PATH

Look for -uninstalled pc files and update PKG_CONFIG_PATH with the
directories containing those.

This feature is useful for users building the GStreamer stack
using meson and having to link it to another project which is still
using the autotools.

Fix a regression from the old gst-uninstalled tool.

https://bugzilla.gnome.org/show_bug.cgi?id=776810

diff --git a/gst-uninstalled.py b/gst-uninstalled.py
index cd11488..1f5bf83 100755 (executable)
--- a/gst-uninstalled.py
+++ b/gst-uninstalled.py
@@ -83,6 +83,7 @@ def get_subprocess_env(options):
 
     presets = set()
     encoding_targets = set()
+    pkg_dirs = set()
     if '--installed' in subprocess.check_output([mesonintrospect, '-h']).decode():
         installed_s = subprocess.check_output([sys.executable, mesonintrospect,
                                                options.builddir, '--installed'])
@@ -92,12 +93,21 @@ def get_subprocess_env(options):
             elif path.endswith('.gep'):
                 encoding_targets.add(
                     os.path.abspath(os.path.join(os.path.dirname(path), '..')))
+            elif path.endswith('.pc'):
+                # Is there a -uninstalled pc file for this file?
+                uninstalled = "{0}-uninstalled.pc".format(path[:-3])
+                if os.path.exists(uninstalled):
+                    pkg_dirs.add(os.path.dirname(path))
+
         for p in presets:
             prepend_env_var(env, 'GST_PRESET_PATH', p)
 
         for t in encoding_targets:
             prepend_env_var(env, 'GST_ENCODING_TARGET_PATH', t)
 
+        for pkg_dir in pkg_dirs:
+            prepend_env_var(env, "PKG_CONFIG_PATH", pkg_dir)
+
     return env