1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#!/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()
|
