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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
import os
import subprocess
import sys
import tempfile
from argparse import Action, ArgumentParser
import buildconfig
class CPPFlag(Action):
all_flags = []
def __call__(self, parser, namespace, values, option_string=None):
if "windres" in buildconfig.substs["RC"].lower():
if option_string == "-U":
if option_string == "-I":
option_string = "--include-dir"
self.all_flags.extend((option_string, values))
def generate_res():
parser = ArgumentParser()
"-D", action=CPPFlag, metavar="VAR[=VAL]", help="Define a variable"
parser.add_argument("-U", action=CPPFlag, metavar="VAR", help="Undefine a variable")
"-I", action=CPPFlag, metavar="DIR", help="Search path for includes"
parser.add_argument("-o", dest="output", metavar="OUTPUT", help="Output file")
parser.add_argument("input", help="Input file")
args = parser.parse_args()
is_windres = "windres" in buildconfig.substs["RC"].lower()
verbose = os.environ.get("BUILD_VERBOSE_LOG")
# llvm-rc doesn't preprocess on its own, so preprocess manually
# Theoretically, not windres could be rc.exe, but configure won't use it
# unless you really ask for it, and it will still work with preprocessed
# output.
if not is_windres:
fd, path = tempfile.mkstemp(suffix=".rc")
command = buildconfig.substs["CXXCPP"] + CPPFlag.all_flags
command.extend(("-DRC_INVOKED", args.input))
cpu_arch_dict = {"x86_64": "_AMD64_", "x86": "_X86_", "aarch64": "_ARM64_"}
# add a preprocessor #define that specifies the CPU architecture
cpu_arch_ppd = cpu_arch_dict[buildconfig.substs["TARGET_CPU"]]
command.extend(("-D", cpu_arch_ppd))
if verbose:
print("Executing:", " ".join(command))
with os.fdopen(fd, "wb") as fh:
retcode =, stdout=fh).returncode
if retcode:
# Rely on the subprocess printing out any relevant error
return retcode
path = args.input
command = [buildconfig.substs["RC"]]
if is_windres:
command.extend(("-O", "coff"))
# Even though llvm-rc doesn't preprocess, we still need to pass at least
# the -I flags.
if args.output:
if is_windres:
command.extend(("-o", args.output))
# Use win1252 code page for the input.
command.extend(("-c", "1252", "-Fo" + args.output))
if verbose:
print("Executing:", " ".join(command))
retcode =
if retcode:
# Rely on the subprocess printing out any relevant error
return retcode
if path != args.input:
return 0
if __name__ == "__main__":