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#!/usr/bin/env python3
# libmisc/wrap-cc - Wrapper around GCC to enhance the preprocessor
#
# Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
import os
import sys
import typing
def preprocess(all_args: list[str]) -> typing.NoReturn:
_args = all_args
def shift(n: int) -> list[str]:
nonlocal _args
ret = _args[:n]
_args = _args[n:]
return ret
arg0 = shift(1)[0]
flags: list[str] = []
positional: list[str] = []
while _args:
if len(_args[0]) > 2 and _args[0][0] == "-" and _args[0][1] in "IDU":
_args = [_args[0][:2], _args[0][2:], *_args[1:]]
match _args[0]:
# Mode
case "-E" | "-quiet" | "-lang-asm":
flags += shift(1)
# Search path
case "-I" | "-imultilib" | "-isystem":
flags += shift(2)
# Define/Undefine
case "-D" | "-U":
flags += shift(2)
# Optimization
case "-O0" | "-O1" | "-O2" | "-O3" | "-Os" | "-Ofast" | "-Og" | "-Oz":
flags += shift(1)
case "-g":
flags += shift(1)
# Output files
case "-MD" | "-MF" | "-MT" | "-dumpbase" | "-dumpbase-ext":
flags += shift(2)
case "-o":
flags += shift(2)
# Other
case _:
if _args[0].startswith("-"):
if _args[0].startswith("-std="):
flags += shift(1)
elif _args[0].startswith("-m"):
flags += shift(1)
elif _args[0].startswith("-f"):
flags += shift(1)
elif _args[0].startswith("-W"):
flags += shift(1)
else:
raise ValueError(f"unknown flag: {_args!r}")
else:
positional += shift(1)
os.execvp(arg0, [arg0, *flags, *positional])
def main(all_args: list[str]) -> typing.NoReturn:
if len(all_args) >= 2 and all_args[0].endswith("cc1") and all_args[1] == "-E":
preprocess(all_args)
else:
os.execvp(all_args[0], all_args)
if __name__ == "__main__":
main(sys.argv[1:])
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