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 import os
   5
   6 from mozbuild.util import FileAvoidWrite
   7
   8 header_template = """#pragma GCC system_header
   9 #pragma GCC visibility push(default)
  10 {includes}
  11 #pragma GCC visibility pop
  12 """
  13
  14 include_next_template = "#include_next <{header}>"
  15
  16
  17 # The 'unused' arg is the output file from the file_generate action. We actually
  18 # generate all the files in header_list
  19 def gen_wrappers(unused, outdir, *header_list):
  20     for header in header_list:
  21         with FileAvoidWrite(os.path.join(outdir, header)) as f:
  22             includes = include_next_template.format(header=header)
  23             if header == "wayland-util.h":
  24                 # wayland-util.h in Wayland < 1.12 includes math.h inside an
  25                 # extern "C" block, which breaks including the header from C++.
  26                 # This was fixed in Wayland 1.12, but for versions earlier than
  27                 # that, we work around that by force-including math.h first.
  28                 includes = "#include <math.h>\n" + includes
  29             elif header == "wayland-client.h":
  30                 # The system wayland-client.h uses quote includes for
  31                 # wayland-util.h, which means wayland-util.h is picked from the
  32                 # directory containing wayland-client.h first, and there's no
  33                 # way around that with -I, -isystem, or other flags. So, we
  34                 # force to include it from our wrapper, before including the
  35                 # system header, so that our wayland-util.h wrapper is picked
  36                 # first.
  37                 includes = '#include "wayland-util.h"\n' + includes
  38             f.write(header_template.format(includes=includes))