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#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Compiler version checking tool for gcc
Print gcc version as XY if you are running gcc X.Y.*.
This is used to tweak build flags for gcc 4.4.
"""
import os
import re
import subprocess
import sys
def GetVersion(compiler):
try:
# Note that compiler could be something tricky like "distcc g++".
compiler = compiler + " -dumpversion"
pipe = subprocess.Popen(compiler, shell=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
gcc_output, gcc_error = pipe.communicate()
if pipe.returncode:
raise subprocess.CalledProcessError(pipe.returncode, compiler)
result = re.match(r"(\d+)\.(\d+)", gcc_output)
return result.group(1) + result.group(2)
except Exception, e:
if gcc_error:
sys.stderr.write(gcc_error)
print >> sys.stderr, "compiler_version.py failed to execute:", compiler
print >> sys.stderr, e
return ""
def main():
# Check if CXX environment variable exists and
# if it does use that compiler.
cxx = os.getenv("CXX", None)
if cxx:
cxxversion = GetVersion(cxx)
if cxxversion != "":
print cxxversion
return 0
else:
# Otherwise we check the g++ version.
gccversion = GetVersion("g++")
if gccversion != "":
print gccversion
return 0
return 1
if __name__ == "__main__":
sys.exit(main())
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