make-system-wrappers.py

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# 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/.

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))