linkers: Fix AppleDynamicLinker not returning any rpaths to remove

Fixes regression from commit 78e9009ff9d36925e04f329f9082841002ddd848.

The above commit relied on rpath_dirs_to_remove being present and
correctly filled, which was never the case for the AppleDynamicLinker.
The result was that all the build-dir-only RPATHs were being carried
over to the installed files.

This commit implements returning the list of RPATHs to remove in
AppleDynamicLinker, doing pretty much the same thing as what's in the
GnuLikeDynamicLinkerMixin. Thanks to that, depfixer now correctly
removes build-time Meson-created RPATHs, as it used to before 1.4.1.

1 files changed, 4 insertions, 2 deletions

diff --git a/mesonbuild/linkers/linkers.py b/mesonbuild/linkers/linkers.py
index f5e8080..c3750cc 100644
--- a/mesonbuild/linkers/linkers.py
+++ b/mesonbuild/linkers/linkers.py
@@ -819,17 +819,19 @@ class AppleDynamicLinker(PosixDynamicLinkerMixin, DynamicLinker):
         if not rpath_paths and not install_rpath and not build_rpath:
             return ([], set())
         args: T.List[str] = []
+        rpath_dirs_to_remove: T.Set[bytes] = set()
         # @loader_path is the equivalent of $ORIGIN on macOS
         # https://stackoverflow.com/q/26280738
         origin_placeholder = '@loader_path'
         processed_rpaths = prepare_rpaths(rpath_paths, build_dir, from_dir)
         all_paths = mesonlib.OrderedSet([os.path.join(origin_placeholder, p) for p in processed_rpaths])
         if build_rpath != '':
-            all_paths.add(build_rpath)
+            all_paths.update(build_rpath.split(':'))
         for rp in all_paths:
+            rpath_dirs_to_remove.add(rp.encode('utf8'))
             args.extend(self._apply_prefix('-rpath,' + rp))
 
-        return (args, set())
+        return (args, rpath_dirs_to_remove)
 
     def get_thinlto_cache_args(self, path: str) -> T.List[str]:
         return ["-Wl,-cache_path_lto," + path]