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102 lines
4.0 KiB
102 lines
4.0 KiB
#!/usr/bin/env python3 |
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# Copyright 2013 The Meson development team |
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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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from optparse import OptionParser |
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usage_info = '%prog [options] <shared library> <symbol file>' |
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parser = OptionParser(usage=usage_info) |
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parser.add_option('--cross-host', default=None, dest='cross_host', |
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help='cross compilation host 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 += [' '.join(x.split()[0:2]) for x in output.split('\n') if len(x) > 0] |
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write_if_changed('\n'.join(result) + '\n', outfilename) |
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def osx_syms(libfilename, outfilename): |
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pe = subprocess.Popen(['otool', '-l', 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('Otool does not work.') |
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arr = output.split('\n') |
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for (i, val) in enumerate(arr): |
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if 'LC_ID_DYLIB' in val: |
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match = i |
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break |
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result = [arr[match+2], arr[match+5]] # Libreoffice stores all 5 lines but the others seem irrelevant. |
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pnm = subprocess.Popen(['nm', '-g', '-P', libfilename], 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 += [' '.join(x.split()[0:2]) for x in output.split('\n') if len(x) > 0 and not x.endswith('U')] |
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write_if_changed('\n'.join(result) + '\n', outfilename) |
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def gen_symbols(libfilename, outfilename, cross_host): |
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if cross_host is not None: |
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# In case of cross builds just always relink. |
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# In theory we could determine the correct |
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# toolset but there are more important things |
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# to do. |
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dummy_syms(outfilename) |
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elif platform.system() == 'Linux': |
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linux_syms(libfilename, outfilename) |
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elif platform.system() == 'Darwin': |
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osx_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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(options, args) = parser.parse_args(sys.argv) |
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if len(args) != 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, options.cross_host)
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