| #!/usr/bin/env python |
| |
| import os |
| import subprocess |
| |
| def main(): |
| cc = os.environ.get('CC', 'cc') |
| sink = open(os.devnull, 'wb') |
| try: |
| cc_is_clang = 'clang' in subprocess.check_output( |
| [cc, '--version'], universal_newlines=True, stderr=sink) |
| except OSError: |
| # We probably just don't have CC/cc. |
| return |
| |
| def warning_supported(warning): |
| return subprocess.call([cc, '-x', 'c', '-E', '-Werror', |
| '-W%s' % warning, os.devnull], stdout=sink, stderr=sink) == 0 |
| def can_enable(): |
| # This would be a problem |
| if not warning_supported('all'): |
| return False |
| |
| # If we aren't clang, make sure we have gcc 4.8 at least |
| if not cc_is_clang: |
| try: |
| v = subprocess.check_output([cc, '-dumpversion'], stderr=sink).decode("utf-8") |
| v = v.strip(' \r\n').split('.') |
| v = list(map(int, v)) |
| if v[0] < 4 or (v[0] == 4 and v[1] < 8): |
| # gcc 4.8 minimum |
| return False |
| except OSError: |
| return False |
| return True |
| |
| if not can_enable(): |
| print('-DNSS_NO_GCC48') |
| return |
| |
| print('-Werror') |
| print('-Wall') |
| |
| def set_warning(warning, contra=''): |
| if warning_supported(warning): |
| print('-W%s%s' % (contra, warning)) |
| |
| if cc_is_clang: |
| # clang is unable to handle glib's expansion of strcmp and similar for |
| # optimized builds, so disable the resulting errors. |
| # See https://llvm.org/bugs/show_bug.cgi?id=20144 |
| for w in ['array-bounds', 'unevaluated-expression', |
| 'parentheses-equality']: |
| set_warning(w, 'no-') |
| print('-Qunused-arguments') |
| |
| set_warning('shadow') |
| |
| if __name__ == '__main__': |
| main() |
