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Parse the Cargo.toml file, looking for the unexpected_cfgs configuration. When generating --cfg options from the config-host.h file, only use those that are included in the configuration. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
113 lines
3.1 KiB
Python
113 lines
3.1 KiB
Python
#!/usr/bin/env python3
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"""Generate rustc arguments for meson rust builds.
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This program generates --cfg compile flags for the configuration headers passed
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as arguments.
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Copyright (c) 2024 Linaro Ltd.
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Authors:
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Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import argparse
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import logging
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from pathlib import Path
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from typing import Any, Iterable, Mapping, Optional, Set
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try:
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import tomllib
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except ImportError:
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import tomli as tomllib
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class CargoTOML:
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tomldata: Mapping[Any, Any]
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check_cfg: Set[str]
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def __init__(self, path: str):
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with open(path, 'rb') as f:
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self.tomldata = tomllib.load(f)
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self.check_cfg = set(self.find_check_cfg())
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def find_check_cfg(self) -> Iterable[str]:
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toml_lints = self.lints
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rust_lints = toml_lints.get("rust", {})
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cfg_lint = rust_lints.get("unexpected_cfgs", {})
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return cfg_lint.get("check-cfg", [])
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@property
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def lints(self) -> Mapping[Any, Any]:
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return self.get_table("lints")
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def get_table(self, key: str) -> Mapping[Any, Any]:
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table = self.tomldata.get(key, {})
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return table
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def generate_cfg_flags(header: str, cargo_toml: CargoTOML) -> Iterable[str]:
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"""Converts defines from config[..].h headers to rustc --cfg flags."""
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with open(header, encoding="utf-8") as cfg:
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config = [l.split()[1:] for l in cfg if l.startswith("#define")]
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cfg_list = []
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for cfg in config:
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name = cfg[0]
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if f'cfg({name})' not in cargo_toml.check_cfg:
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continue
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if len(cfg) >= 2 and cfg[1] != "1":
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continue
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cfg_list.append("--cfg")
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cfg_list.append(name)
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return cfg_list
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def main() -> None:
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parser = argparse.ArgumentParser()
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parser.add_argument("-v", "--verbose", action="store_true")
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parser.add_argument(
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"--config-headers",
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metavar="CONFIG_HEADER",
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action="append",
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dest="config_headers",
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help="paths to any configuration C headers (*.h files), if any",
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required=False,
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default=[],
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)
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parser.add_argument(
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metavar="TOML_FILE",
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action="store",
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dest="cargo_toml",
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help="path to Cargo.toml file",
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)
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args = parser.parse_args()
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if args.verbose:
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logging.basicConfig(level=logging.DEBUG)
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logging.debug("args: %s", args)
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cargo_toml = CargoTOML(args.cargo_toml)
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for header in args.config_headers:
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for tok in generate_cfg_flags(header, cargo_toml):
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print(tok)
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if __name__ == "__main__":
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main()
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