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#!/usr/bin/env python3
#
# Copyright (c) 2021 Varnish Software AS
# All rights reserved.
#
# Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
''' Figure out what developer-warnings CC can grok '''
import os
import sys
import subprocess
import tempfile
DESIRABLE_OPTIONS = [
"-fstack-protector-strong",
"-Werror",
"-Wall",
]
DESIRABLE_WFLAGS = [
"-Wcast-align",
"-Wcast-qual",
"-Wchar-subscripts",
"-Wempty-body",
"-Wextra",
"-Wformat -Wformat-y2k",
"-Wformat -Wformat-zero-length",
"-Wmissing-field-initializers",
"-Wmissing-prototypes",
"-Wnested-externs",
"-Wpointer-arith",
"-Wpointer-sign",
"-Wreturn-type",
"-Wshadow",
"-Wstrict-aliasing",
"-Wstrict-prototypes",
"-Wstring-plus-int",
"-Wswitch",
"-Wunused-parameter",
"-Wunused-parameters",
"-Wunused-result",
"-Wunused-but-set-variable",
"-Wwrite-strings",
]
UNDESIRABLE_WFLAGS = [
"-Wno-system-headers", # Outside of our control
"-Wno-thread-safety", # Does not understand our mutexes are wrapped
"-Wno-sign-compare", # Fixable
]
def cc(compiler, opt, obj, src):
a = compiler.split()
a += ["-c"]
if opt is not None:
a += opt.split()
a += ["-o", obj, src]
try:
j = subprocess.check_output(a, stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as err:
if err.output:
j = err.output
else:
j = ("Returncode %d" % err.returncode).encode('utf8')
return (j)
def main():
compiler = os.environ.get("CC", "cc")
src_file = tempfile.NamedTemporaryFile(suffix='.c')
src_file.write(b'int main(int argc, char **argv) {(void)argc;(void)argv;return(0);}\n')
src_file.flush()
obj_file = tempfile.NamedTemporaryFile(suffix='.o')
j = cc(compiler, None, obj_file.name, src_file.name)
if j:
sys.stderr.write(compiler + " failed without flags\n\t" +
j.decode('utf8') + '\n')
sys.exit(1)
use_flags = []
for i in DESIRABLE_OPTIONS + DESIRABLE_WFLAGS + UNDESIRABLE_WFLAGS:
j = cc(compiler, i, obj_file.name, src_file.name)
if not j:
use_flags.append(i)
else:
sys.stderr.write(compiler + " cannot " + i + '\n')
if b'error: unrecognized command line option' in j:
# LLVM
pass
elif b'warning: unknown warning option' in j:
# GCC
pass
else:
sys.stderr.write("\n\t" + j.decode('utf8') + '\n')
print(" ".join(use_flags))
if __name__ == "__main__":
main()
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