config/make-system-wrappers.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this
   3 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   4 from __future__ import absolute_import
   5 from __future__ import print_function
   6 import os
   7 from mozbuild.util import FileAvoidWrite
   8
   9 header_template = '''#pragma GCC system_header
  10 #pragma GCC visibility push(default)
  11 {includes}
  12 #pragma GCC visibility pop
  13 '''
  14
  15 include_next_template = '#include_next <{header}>'
  16
  17
  18 # The 'unused' arg is the output file from the file_generate action. We actually
  19 # generate all the files in header_list
  20 def gen_wrappers(unused, outdir, *header_list):
  21     for header in header_list:
  22         with FileAvoidWrite(os.path.join(outdir, header)) as f:
  23             includes = include_next_template.format(header=header)
  24             if header == 'wayland-util.h':
  25                 # wayland-util.h in Wayland < 1.12 includes math.h inside an
  26                 # extern "C" block, which breaks including the header from C++.
  27                 # This was fixed in Wayland 1.12, but for versions earlier than
  28                 # that, we work around that by force-including math.h first.
  29                 includes = '#include <math.h>\n' + includes
  30             elif header == 'wayland-client.h':
  31                 # The system wayland-client.h uses quote includes for
  32                 # wayland-util.h, which means wayland-util.h is picked from the
  33                 # directory containing wayland-client.h first, and there's no
  34                 # way around that with -I, -isystem, or other flags. So, we
  35                 # force to include it from our wrapper, before including the
  36                 # system header, so that our wayland-util.h wrapper is picked
  37                 # first.
  38                 includes = '#include "wayland-util.h"\n' + includes
  39             f.write(header_template.format(includes=includes))