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59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
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#!/usr/bin/env python
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# Copyright 2018 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Find incompatible symbols in glibc and output a list of replacements.
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"""
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import re
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import sys
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# This constant comes from https://crbug.com/580892
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MAX_ALLOWED_GLIBC_VERSION = [2, 17]
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def get_replacements(nm_file, max_allowed_glibc_version):
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symbol_format = re.compile('\S+ \S+ ([^@]+)@@?(\S+)\n')
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version_format = re.compile('GLIBC_[0-9\.]+')
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symbols = {}
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for line in nm_file:
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m = re.match(symbol_format, line)
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symbol = m.group(1)
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version = m.group(2)
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if not re.match(version_format, version):
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continue
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if symbol in symbols:
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symbols[symbol].add(version)
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else:
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symbols[symbol] = set([version])
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replacements = []
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for symbol, versions in symbols.iteritems():
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if len(versions) <= 1:
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continue
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versions_parsed = [[
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int(part) for part in version.lstrip('GLIBC_').split('.')
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] for version in versions]
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if (max(versions_parsed) > max_allowed_glibc_version and
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min(versions_parsed) <= max_allowed_glibc_version):
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# Use the newest allowed version of the symbol.
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replacement_version_parsed = max([
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version for version in versions_parsed
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if version <= max_allowed_glibc_version
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])
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replacement_version = 'GLIBC_' + '.'.join(
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[str(part) for part in replacement_version_parsed])
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replacements.append('__asm__(".symver %s, %s@%s");' %
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(symbol, symbol, replacement_version))
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return sorted(replacements)
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if __name__ == '__main__':
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replacements = get_replacements(sys.stdin, MAX_ALLOWED_GLIBC_VERSION)
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if replacements:
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print('// Chromium-specific hack.')
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print('// See explanation in sysroot-creator.sh.')
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for replacement in replacements:
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print replacement
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