1 files changed, 39 insertions, 0 deletions
diff --git a/config/make-system-wrappers.py b/config/make-system-wrappers.py
new file mode 100644
index 0000000000..d46ec5cc0f
--- /dev/null
+++ b/config/make-system-wrappers.py
@@ -0,0 +1,39 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+from __future__ import print_function
+import os
+from mozbuild.util import FileAvoidWrite
+
+header_template = """#pragma GCC system_header
+#pragma GCC visibility push(default)
+{includes}
+#pragma GCC visibility pop
+"""
+
+include_next_template = "#include_next <{header}>"
+
+
+# The 'unused' arg is the output file from the file_generate action. We actually
+# generate all the files in header_list
+def gen_wrappers(unused, outdir, *header_list):
+    for header in header_list:
+        with FileAvoidWrite(os.path.join(outdir, header)) as f:
+            includes = include_next_template.format(header=header)
+            if header == "wayland-util.h":
+                # wayland-util.h in Wayland < 1.12 includes math.h inside an
+                # extern "C" block, which breaks including the header from C++.
+                # This was fixed in Wayland 1.12, but for versions earlier than
+                # that, we work around that by force-including math.h first.
+                includes = "#include <math.h>\n" + includes
+            elif header == "wayland-client.h":
+                # The system wayland-client.h uses quote includes for
+                # wayland-util.h, which means wayland-util.h is picked from the
+                # directory containing wayland-client.h first, and there's no
+                # way around that with -I, -isystem, or other flags. So, we
+                # force to include it from our wrapper, before including the
+                # system header, so that our wayland-util.h wrapper is picked
+                # first.
+                includes = '#include "wayland-util.h"\n' + includes
+            f.write(header_template.format(includes=includes))