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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
compiler_version_cache = {} # Map from (compiler, tool) -> version.
def Usage(program_name):
print '%s MODE TOOL' % os.path.basename(program_name)
print 'MODE: host or target.'
print 'TOOL: assembler or compiler or linker.'
return 1
def ParseArgs(args):
if len(args) != 2:
raise Exception('Invalid number of arguments')
mode = args[0]
tool = args[1]
if mode not in ('host', 'target'):
raise Exception('Invalid mode: %s' % mode)
if tool not in ('assembler',):
raise Exception('Invalid tool: %s' % tool)
return mode, tool
def GetEnvironFallback(var_list, default):
"""Look up an environment variable from a possible list of variable names."""
for var in var_list:
if var in os.environ:
return os.environ[var]
return default
def GetVersion(compiler, tool):
tool_output = tool_error = None
cache_key = (compiler, tool)
cached_version = compiler_version_cache.get(cache_key)
if cached_version:
return cached_version
try:
# Note that compiler could be something tricky like "distcc g++".
if 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)
else:
raise Exception("Unknown tool %s" % tool)
# Force the locale to C otherwise the version string could be localized
# making regex matching fail.
env = os.environ.copy()
env["LC_ALL"] = "C"
pipe = subprocess.Popen(compiler, shell=True, env=env,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
tool_output, tool_error = pipe.communicate()
if pipe.returncode:
raise subprocess.CalledProcessError(pipe.returncode, compiler)
parsed_output = version_re.match(tool_output)
result = parsed_output.group(1) + parsed_output.group(2)
compiler_version_cache[cache_key] = result
return result
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):
try:
(mode, tool) = ParseArgs(args[1:])
except Exception, e:
sys.stderr.write(e.message + '\n\n')
return Usage(args[0])
ret_code, result = ExtractVersion(mode, tool)
if ret_code == 0:
print result
return ret_code
def DoMain(args):
"""Hook to be called from gyp without starting a separate python
interpreter."""
(mode, tool) = ParseArgs(args)
ret_code, result = ExtractVersion(mode, tool)
if ret_code == 0:
return result
raise Exception("Failed to extract compiler version for args: %s" % args)
def ExtractVersion(mode, tool):
# Check if various CXX environment variables exist and use them if they
# exist. The preferences and fallback order is a close approximation of
# GenerateOutputForConfig() in GYP's ninja generator.
# The main difference being not supporting GYP's make_global_settings.
environments = ['CXX_target', 'CXX']
if mode == 'host':
environments = ['CXX_host'] + environments;
compiler = GetEnvironFallback(environments, 'c++')
if compiler:
compiler_version = GetVersion(compiler, tool)
if compiler_version != "":
return (0, compiler_version)
return (1, None)
if __name__ == "__main__":
sys.exit(main(sys.argv))
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