604f3e4e90
Shell scripts are not easily invoked from the build process on MSYS, so convert undefsym.sh to a python script. Signed-off-by: Yonggang Luo <luoyonggang@gmail.com> Message-Id: <20200902170054.810-3-luoyonggang@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
#!/usr/bin/env python3
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# Before a shared module's DSO is produced, a static library is built for it
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# and passed to this script. The script generates -Wl,-u options to force
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# the inclusion of symbol from libqemuutil.a if the shared modules need them,
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# This is necessary because the modules may use functions not needed by the
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# executable itself, which would cause the function to not be linked in.
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# Then the DSO loading would fail because of the missing symbol.
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import sys
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import subprocess
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def filter_lines_set(stdout, from_staticlib):
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linesSet = set()
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for line in stdout.splitlines():
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tokens = line.split(b' ')
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if len(tokens) >= 1:
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if len(tokens) > 1:
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if from_staticlib and tokens[1] == b'U':
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continue
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if not from_staticlib and tokens[1] != b'U':
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continue
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new_line = b'-Wl,-u,' + tokens[0]
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if not new_line in linesSet:
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linesSet.add(new_line)
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return linesSet
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def main(args):
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if len(args) <= 3:
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sys.exit(0)
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nm = args[1]
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staticlib = args[2]
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pc = subprocess.run([nm, "-P", "-g", staticlib], stdout=subprocess.PIPE)
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if pc.returncode != 0:
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sys.exit(1)
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staticlib_syms = filter_lines_set(pc.stdout, True)
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shared_modules = args[3:]
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pc = subprocess.run([nm, "-P", "-g"] + shared_modules, stdout=subprocess.PIPE)
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if pc.returncode != 0:
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sys.exit(1)
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modules_undef_syms = filter_lines_set(pc.stdout, False)
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lines = sorted(staticlib_syms.intersection(modules_undef_syms))
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sys.stdout.buffer.write(b'\n'.join(lines))
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if __name__ == "__main__":
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main(sys.argv)
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