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#!/usr/bin/env python3
# Copyright 2025 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Invokes `rustc --print=cfg --target=...` and writes results to a file.
This script is typically invoked using the
`//build/rust/gni_impl:rustc_print_cfg` target.
"""
import argparse
import io
import os
import platform
import re
import subprocess
import sys
import tempfile
def rustc_name():
if platform.system() == 'Windows':
return "rustc.exe"
else:
return "rustc"
def capture_rustc_cfg(rust_prefix, target, output_path):
""" Invokes `rustc --print=cfg --target=<target>` and saves results.
Results are saved to a file at `output_path`. """
rustc_path = os.path.join(rust_prefix, rustc_name())
# TODO(lukasza): Check if command-line flags other `--target` may affect the
# output of `--print-cfg`. If so, then consider also passing extra `args`
# (derived from `rustflags` maybe?).
args = [rustc_path, "--print=cfg", f"--target={target}"]
os.makedirs(os.path.dirname(output_path), exist_ok=True)
with open(output_path, 'w') as output_file:
subprocess.run(args, stdout=output_file, check=True)
def main():
parser = argparse.ArgumentParser("rustc_print_cfg.py")
parser.add_argument('--rust-prefix', required=True, help='rust path prefix')
parser.add_argument('--target', required=True, help='rust target triple')
parser.add_argument('--output-path', required=True, help='output file')
args = parser.parse_args()
capture_rustc_cfg(args.rust_prefix, args.target, args.output_path)
return 0
if __name__ == '__main__':
sys.exit(main())
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