2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
6 """Compiler version checking tool for gcc
8 Print gcc version as XY if you are running gcc X.Y.*.
9 This is used to tweak build flags for gcc 4.4.
17 def GetVersion(compiler):
19 # Note that compiler could be something tricky like "distcc g++".
20 compiler = compiler + " -dumpversion"
21 pipe = subprocess.Popen(compiler, shell=True,
22 stdout=subprocess.PIPE, stderr=subprocess.PIPE)
23 gcc_output, gcc_error = pipe.communicate()
25 raise subprocess.CalledProcessError(pipe.returncode, compiler)
27 result = re.match(r"(\d+)\.(\d+)", gcc_output)
28 return result.group(1) + result.group(2)
31 sys.stderr.write(gcc_error)
32 print >> sys.stderr, "compiler_version.py failed to execute:", compiler
33 print >> sys.stderr, e
37 # Check if CXX environment variable exists and
38 # if it does use that compiler.
39 cxx = os.getenv("CXX", None)
41 cxxversion = GetVersion(cxx)
46 # Otherwise we check the g++ version.
47 gccversion = GetVersion("g++")
54 if __name__ == "__main__":