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#!/usr/bin/python3 -tt
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# Copyright 2013 Jussi Pakkanen
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script extracts the symbols of a given shared library
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# into a file. If the symbols have not changed, the file is not
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# touched. This information is used to skip link steps if the
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# ABI has not changed.
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# This file is basically a reimplementation of
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# http://cgit.freedesktop.org/libreoffice/core/commit/?id=3213cd54b76bc80a6f0516aac75a48ff3b2ad67c
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import sys, subprocess, platform
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def dummy_syms(outfilename):
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"""Just touch it so relinking happens always."""
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open(outfilename, 'w').close()
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def write_if_changed(text, outfilename):
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try:
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oldtext = open(outfilename, 'r').read()
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if text == oldtext:
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return
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except FileNotFoundError:
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pass
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open(outfilename, 'w').write(text)
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def linux_syms(libfilename, outfilename):
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pe = subprocess.Popen(['readelf', '-d', libfilename], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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output = pe.communicate()[0].decode()
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if pe.returncode != 0:
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raise RuntimeError('Readelf does not work')
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result = [x for x in output.split('\n') if 'SONAME' in x]
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assert(len(result) == 1)
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pnm = subprocess.Popen(['nm', '--dynamic', '--extern-only', '--defined-only', '--format=posix', libfilename],
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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output = pnm.communicate()[0].decode()
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if pnm.returncode != 0:
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raise RuntimeError('nm does not work.')
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result += [x.split()[0] for x in output.split('\n') if len(x) > 0]
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write_if_changed('\n'.join(result), outfilename)
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def gen_symbols(libfilename, outfilename):
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if platform.system() == 'Linux':
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linux_syms(libfilename, outfilename)
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else:
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dummy_syms(outfilename)
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if __name__ == '__main__':
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if len(sys.argv) != 3:
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print(sys.argv[0], '<shared library file> <output file>')
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sys.exit(1)
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libfile = sys.argv[1]
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outfile = sys.argv[2]
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gen_symbols(libfile, outfile)
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