gobject-introspection: Fix macos shared lib paths

pkgs/development/libraries/gobject-introspection/absolute_shlib_path.patch

@@ -87,8 +87,8 @@
 +                    m = pattern.search(line)
                  if m:
                      del patterns[library]
--                    shlibs.append(m.group(1))
-+                    shlibs.append(os.path.join(options.fallback_libpath, m.group(1)))
+-                    shlibs.append(_sanitize_install_name(m.group(1)))
++                    shlibs.append(os.path.join(options.fallback_libpath, _sanitize_install_name(m.group(1))))
                      break
 
          if len(patterns) > 0:

pkgs/development/libraries/gobject-introspection/default.nix

@@ -39,6 +39,7 @@ stdenv.mkDerivation rec {
   setupHook = ./setup-hook.sh;
 
   patches = [
+    ./macos-shared-library.patch
     (substituteAll {
       src = ./absolute_shlib_path.patch;
       inherit nixStoreDir;

pkgs/development/libraries/gobject-introspection/macos-shared-library.patch

@@ -0,0 +1,36 @@
+diff --git a/giscanner/shlibs.py b/giscanner/shlibs.py
+index c93d20c..4d4915d 100644
+--- a/giscanner/shlibs.py
++++ b/giscanner/shlibs.py
+@@ -43,6 +43,22 @@ def _resolve_libtool(options, binary, libraries):
+
+     return shlibs
+
++def _sanitize_install_name(install_name):
++    '''
++    On macOS, the dylib can be built with install_name as @rpath/libfoo.so
++    instead of the absolute path to the library, so handle that. The name
++    can also be @loader_path or @executable_path.
++    '''
++    if not install_name.startswith('@'):
++        return install_name
++    if install_name.startswith('@rpath/'):
++        return install_name[7:]
++    if install_name.startswith('@loader_path/'):
++        return install_name[13:]
++    if install_name.startswith('@executable_path/'):
++        return install_name[17:]
++    raise RuntimeError('Unknown install_name {!r}'.format(install_name))
++
+
+ # Assume ldd output is something vaguely like
+ #
+@@ -121,7 +137,7 @@ def _resolve_non_libtool(options, binary, libraries):
+                 m = pattern.search(line)
+                 if m:
+                     del patterns[library]
+-                    shlibs.append(m.group(1))
++                    shlibs.append(_sanitize_install_name(m.group(1)))
+                     break
+
+         if len(patterns) > 0: