blob: 8db0108110963c9077695b26aacaab9ac4c72fe7 [file] [log] [blame]
Ben Murdoch097c5b22016-05-18 11:27:45 +01001#!/usr/bin/env python
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.
5
6"""Compiler version checking tool for gcc
7
8Print gcc version as XY if you are running gcc X.Y.*.
9This is used to tweak build flags for gcc 4.4.
10"""
11
12import os
13import re
14import subprocess
15import sys
16
17
18compiler_version_cache = {} # Map from (compiler, tool) -> version.
19
20
21def Usage(program_name):
22 print '%s MODE TOOL' % os.path.basename(program_name)
23 print 'MODE: host or target.'
24 print 'TOOL: assembler or compiler or linker.'
25 return 1
26
27
28def ParseArgs(args):
29 if len(args) != 2:
30 raise Exception('Invalid number of arguments')
31 mode = args[0]
32 tool = args[1]
33 if mode not in ('host', 'target'):
34 raise Exception('Invalid mode: %s' % mode)
35 if tool not in ('assembler',):
36 raise Exception('Invalid tool: %s' % tool)
37 return mode, tool
38
39
40def GetEnvironFallback(var_list, default):
41 """Look up an environment variable from a possible list of variable names."""
42 for var in var_list:
43 if var in os.environ:
44 return os.environ[var]
45 return default
46
47
48def GetVersion(compiler, tool):
49 tool_output = tool_error = None
50 cache_key = (compiler, tool)
51 cached_version = compiler_version_cache.get(cache_key)
52 if cached_version:
53 return cached_version
54 try:
55 # Note that compiler could be something tricky like "distcc g++".
56 if tool == "assembler":
57 compiler = compiler + " -Xassembler --version -x assembler -c /dev/null"
58 # Unmodified: GNU assembler (GNU Binutils) 2.24
59 # Ubuntu: GNU assembler (GNU Binutils for Ubuntu) 2.22
60 # Fedora: GNU assembler version 2.23.2
61 version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
62 else:
63 raise Exception("Unknown tool %s" % tool)
64
65 # Force the locale to C otherwise the version string could be localized
66 # making regex matching fail.
67 env = os.environ.copy()
68 env["LC_ALL"] = "C"
69 pipe = subprocess.Popen(compiler, shell=True, env=env,
70 stdout=subprocess.PIPE, stderr=subprocess.PIPE)
71 tool_output, tool_error = pipe.communicate()
72 if pipe.returncode:
73 raise subprocess.CalledProcessError(pipe.returncode, compiler)
74
75 parsed_output = version_re.match(tool_output)
76 result = parsed_output.group(1) + parsed_output.group(2)
77 compiler_version_cache[cache_key] = result
78 return result
79 except Exception, e:
80 if tool_error:
81 sys.stderr.write(tool_error)
82 print >> sys.stderr, "compiler_version.py failed to execute:", compiler
83 print >> sys.stderr, e
84 return ""
85
86
87def main(args):
88 try:
89 (mode, tool) = ParseArgs(args[1:])
90 except Exception, e:
91 sys.stderr.write(e.message + '\n\n')
92 return Usage(args[0])
93
94 ret_code, result = ExtractVersion(mode, tool)
95 if ret_code == 0:
96 print result
97 return ret_code
98
99
100def DoMain(args):
101 """Hook to be called from gyp without starting a separate python
102 interpreter."""
103 (mode, tool) = ParseArgs(args)
104 ret_code, result = ExtractVersion(mode, tool)
105 if ret_code == 0:
106 return result
107 raise Exception("Failed to extract compiler version for args: %s" % args)
108
109
110def ExtractVersion(mode, tool):
111 # Check if various CXX environment variables exist and use them if they
112 # exist. The preferences and fallback order is a close approximation of
113 # GenerateOutputForConfig() in GYP's ninja generator.
114 # The main difference being not supporting GYP's make_global_settings.
115 environments = ['CXX_target', 'CXX']
116 if mode == 'host':
117 environments = ['CXX_host'] + environments;
118 compiler = GetEnvironFallback(environments, 'c++')
119
120 if compiler:
121 compiler_version = GetVersion(compiler, tool)
122 if compiler_version != "":
123 return (0, compiler_version)
124 return (1, None)
125
126
127if __name__ == "__main__":
128 sys.exit(main(sys.argv))