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#!/usr/bin/env python3
import os
import sys
import argparse
import sysconfig
def relpath_nodots(path, base):
rel = os.path.normpath(os.path.relpath(path, base))
assert not os.path.isabs(rel)
parts = rel.split(os.path.sep)
if parts and parts[0] == '..':
raise ValueError(f"{path} is not under {base}")
return rel
def main():
parser = argparse.ArgumentParser(description="extract cmake variables from python")
parser.add_argument("variable_name")
args = parser.parse_args()
if args.variable_name == "LLDB_PYTHON_RELATIVE_PATH":
# LLDB_PYTHON_RELATIVE_PATH is the relative path from lldb's prefix
# to where lldb's python libraries will be installed.
#
# The way we're going to compute this is to take the relative path from
# PYTHON'S prefix to where python libraries are supposed to be
# installed.
#
# The result is if LLDB and python are give the same prefix, then
# lldb's python lib will be put in the correct place for python to find it.
# If not, you'll have to use lldb -P or lldb -print-script-interpreter-info
# to figure out where it is.
try:
print(relpath_nodots(sysconfig.get_path("platlib"), sys.prefix))
except ValueError:
# Try to fall back to something reasonable if sysconfig's platlib
# is outside of sys.prefix
if os.name == 'posix':
print('lib/python%d.%d/site-packages' % sys.version_info[:2])
elif os.name == 'nt':
print('Lib\\site-packages')
else:
raise
elif args.variable_name == "LLDB_PYTHON_EXE_RELATIVE_PATH":
tried = list()
exe = sys.executable
prefix = os.path.realpath(sys.prefix)
while True:
try:
print(relpath_nodots(exe, prefix))
break
except ValueError:
tried.append(exe)
# Retry if the executable is symlinked or similar.
# This is roughly equal to os.path.islink, except it also works for junctions on Windows.
if os.path.realpath(exe) != exe:
exe = os.path.realpath(exe)
continue
else:
print("Could not find a relative path to sys.executable under sys.prefix", file=sys.stderr)
for e in tried:
print("tried:", e, file=sys.stderr)
print("realpath(sys.prefix):", prefix, file=sys.stderr)
print("sys.prefix:", sys.prefix, file=sys.stderr)
sys.exit(1)
elif args.variable_name == "LLDB_PYTHON_EXT_SUFFIX":
print(sysconfig.get_config_var('EXT_SUFFIX'))
else:
parser.error(f"unknown variable {args.variable_name}")
if __name__ == '__main__':
main()
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