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#!/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',
'tautological-type-limit-compare',
'sign-compare',
'comma',
'implicit-fallthrough'
]:
set_warning(w, 'no-')
for w in ['tautological-constant-in-range-compare',
'bitfield-enum-conversion',
'empty-body',
'format-type-confusion',
'ignored-qualifiers',
'pointer-arith',
'type-limits',
'unreachable-code',
'unreachable-code-return',
'duplicated-cond',
'logical-op',
'implicit-function-declaration'
]:
set_warning(w,'')
print('-Qunused-arguments')
set_warning('shadow')
if __name__ == '__main__':
main()
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