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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, tool):
tool_output = tool_error = None
try:
# Note that compiler could be something tricky like "distcc g++".
if tool == "compiler":
compiler = compiler + " -dumpversion"
# 4.6
version_re = re.compile(r"(\d+)\.(\d+)")
elif tool == "assembler":
compiler = compiler + " -Xassembler --version -x assembler -c /dev/null"
# Unmodified: GNU assembler (GNU Binutils) 2.24
# Ubuntu: GNU assembler (GNU Binutils for Ubuntu) 2.22
# Fedora: GNU assembler version 2.23.2
version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
elif tool == "linker":
compiler = compiler + " -Xlinker --version"
# Using BFD linker
# Unmodified: GNU ld (GNU Binutils) 2.24
# Ubuntu: GNU ld (GNU Binutils for Ubuntu) 2.22
# Fedora: GNU ld version 2.23.2
# Using Gold linker
# Unmodified: GNU gold (GNU Binutils 2.24) 1.11
# Ubuntu: GNU gold (GNU Binutils for Ubuntu 2.22) 1.11
# Fedora: GNU gold (version 2.23.2) 1.11
version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
else:
raise Exception("Unknown tool %s" % tool)
pipe = subprocess.Popen(compiler, shell=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
tool_output, tool_error = pipe.communicate()
if pipe.returncode:
raise subprocess.CalledProcessError(pipe.returncode, compiler)
result = version_re.match(tool_output)
return result.group(1) + result.group(2)
except Exception, e:
if tool_error:
sys.stderr.write(tool_error)
print >> sys.stderr, "compiler_version.py failed to execute:", compiler
print >> sys.stderr, e
return ""
def main(args):
tool = "compiler"
if len(args) == 1:
tool = args[0]
elif len(args) > 1:
print "Unknown arguments!"
# Check if CXX environment variable exists and
# if it does use that compiler.
cxx = os.getenv("CXX", None)
if cxx:
cxxversion = GetVersion(cxx, tool)
if cxxversion != "":
print cxxversion
return 0
else:
# Otherwise we check the g++ version.
gccversion = GetVersion("g++", tool)
if gccversion != "":
print gccversion
return 0
return 1
if __name__ == "__main__":
sys.exit(main(sys.argv[1:]))
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