27ca945801
Some pythons are configured to set platlib somewhere outside of their sys.prefix. It's important that we at least use some reasonable default for LLDB_PYTHON_RELATIVE_PATH even in that case, because even if the user overrides it on the cmake invocation, cmake will still be called without the override in order to build tablegen. Reviewed By: JDevlieghere, clayborg Differential Revision: https://reviews.llvm.org/D114973
71 lines
2.7 KiB
Python
Executable File
71 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import sys
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import argparse
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import sysconfig
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def relpath_nodots(path, base):
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rel = os.path.normpath(os.path.relpath(path, base))
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assert not os.path.isabs(rel)
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parts = rel.split(os.path.sep)
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if parts and parts[0] == '..':
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raise ValueError(f"{path} is not under {base}")
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return rel
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def main():
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parser = argparse.ArgumentParser(description="extract cmake variables from python")
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parser.add_argument("variable_name")
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args = parser.parse_args()
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if args.variable_name == "LLDB_PYTHON_RELATIVE_PATH":
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# LLDB_PYTHON_RELATIVE_PATH is the relative path from lldb's prefix
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# to where lldb's python libraries will be installed.
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#
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# The way we're going to compute this is to take the relative path from
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# PYTHON'S prefix to where python libraries are supposed to be
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# installed.
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#
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# The result is if LLDB and python are give the same prefix, then
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# lldb's python lib will be put in the correct place for python to find it.
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# If not, you'll have to use lldb -P or lldb -print-script-interpreter-info
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# to figure out where it is.
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try:
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print(relpath_nodots(sysconfig.get_path("platlib"), sys.prefix))
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except ValueError:
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# Try to fall back to something reasonable if sysconfig's platlib
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# is outside of sys.prefix
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if os.name == 'posix':
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print('lib/python%d.%d/site-packages' % sys.version_info[:2])
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elif os.name == 'nt':
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print('Lib\\site-packages')
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else:
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raise
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elif args.variable_name == "LLDB_PYTHON_EXE_RELATIVE_PATH":
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tried = list()
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exe = sys.executable
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prefix = os.path.realpath(sys.prefix)
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while True:
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try:
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print(relpath_nodots(exe, prefix))
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break
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except ValueError:
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tried.append(exe)
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if os.path.islink(exe):
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exe = os.path.join(os.path.realpath(os.path.dirname(exe)), os.readlink(exe))
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continue
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else:
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print("Could not find a relative path to sys.executable under sys.prefix", file=sys.stderr)
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for e in tried:
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print("tried:", e, file=sys.stderr)
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print("realpath(sys.prefix):", prefix, file=sys.stderr)
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print("sys.prefix:", sys.prefix, file=sys.stderr)
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sys.exit(1)
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elif args.variable_name == "LLDB_PYTHON_EXT_SUFFIX":
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print(sysconfig.get_config_var('EXT_SUFFIX'))
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else:
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parser.error(f"unknown variable {args.variable_name}")
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if __name__ == '__main__':
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main()
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