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80 lines
2.5 KiB
Python
Executable File
80 lines
2.5 KiB
Python
Executable File
#!/usr/bin/python
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# This script find the version of libstdc++ and prints it as single number
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# with 8 bits per element. For example, GLIBCXX_3.4.10 becomes
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# 3 << 16 | 4 << 8 | 10 = 197642. This format is easy to use
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# in the C preprocessor.
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# We find out both the host and target versions. Since the output
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# will be used from shell, we just print the two assignments and evaluate
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# them from shell.
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import os
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import subprocess
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import re
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re_for_ld = re.compile('.*\((.*)\).*')
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def parse_readelf_line(x):
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"""Return the version from a readelf line that looks like:
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0x00ec: Rev: 1 Flags: none Index: 8 Cnt: 2 Name: GLIBCXX_3.4.6
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"""
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return x.split(':')[-1].split('_')[-1].strip()
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def parse_ld_line(x):
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"""Parse a line from the output of ld -t. The output of gold is just
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the full path, gnu ld prints "-lstdc++ (path)".
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"""
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t = re_for_ld.match(x)
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if t:
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return t.groups()[0].strip()
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return x.strip()
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def split_ver(v):
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"""Covert the string '1.2.3' into the list [1,2,3]
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"""
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return [int(x) for x in v.split('.')]
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def cmp_ver(a, b):
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"""Compare versions in the form 'a.b.c'
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"""
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for (i, j) in zip(split_ver(a), split_ver(b)):
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if i != j:
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return i - j
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return 0
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def encode_ver(v):
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"""Encode the version as a single number.
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"""
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t = split_ver(v)
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return t[0] << 16 | t[1] << 8 | t[2]
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def find_version(e):
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"""Given the value of environment variable CXX or HOST_CXX, find the
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version of the libstdc++ it uses.
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"""
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args = e.split()
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args += ['-shared', '-Wl,-t']
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p = subprocess.Popen(args, stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
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candidates = [x for x in p.stdout if 'libstdc++.so' in x]
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if not candidates:
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return ''
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assert len(candidates) == 1
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libstdcxx = parse_ld_line(candidates[-1])
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p = subprocess.Popen(['readelf', '-V', libstdcxx], stdout=subprocess.PIPE)
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versions = [parse_readelf_line(x)
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for x in p.stdout.readlines() if 'Name: GLIBCXX' in x]
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last_version = sorted(versions, cmp = cmp_ver)[-1]
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return encode_ver(last_version)
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if __name__ == '__main__':
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cxx_env = os.environ['CXX']
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print 'MOZ_LIBSTDCXX_TARGET_VERSION=%s' % find_version(cxx_env)
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host_cxx_env = os.environ.get('HOST_CXX', cxx_env)
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print 'MOZ_LIBSTDCXX_HOST_VERSION=%s' % find_version(host_cxx_env)
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