1 files changed, 97 insertions, 0 deletions
diff --git a/config/create_res.py b/config/create_res.py
new file mode 100644
index 0000000000..5588fa0a49
--- /dev/null
+++ b/config/create_res.py
@@ -0,0 +1,97 @@
+# 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 http://mozilla.org/MPL/2.0/.
+
+from argparse import (
+    Action,
+    ArgumentParser,
+)
+import os
+import subprocess
+import sys
+import tempfile
+
+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":
+                return
+            if option_string == "-I":
+                option_string = "--include-dir"
+
+        self.all_flags.extend((option_string, values))
+
+
+def generate_res():
+    parser = ArgumentParser()
+    parser.add_argument(
+        "-D", action=CPPFlag, metavar="VAR[=VAL]", help="Define a variable"
+    )
+    parser.add_argument("-U", action=CPPFlag, metavar="VAR", help="Undefine a variable")
+    parser.add_argument(
+        "-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.
+    try:
+        if not is_windres:
+            fd, path = tempfile.mkstemp(suffix=".rc")
+            command = buildconfig.substs["CXXCPP"] + CPPFlag.all_flags
+            command.extend(("-DRC_INVOKED", args.input))
+            if verbose:
+                print("Executing:", " ".join(command))
+            with os.fdopen(fd, "wb") as fh:
+                retcode = subprocess.run(command, stdout=fh).returncode
+                if retcode:
+                    # Rely on the subprocess printing out any relevant error
+                    return retcode
+        else:
+            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.
+        command.extend(CPPFlag.all_flags)
+
+        if args.output:
+            if is_windres:
+                command.extend(("-o", args.output))
+            else:
+                # Use win1252 code page for the input.
+                command.extend(("-c", "1252", "-Fo" + args.output))
+
+        command.append(path)
+
+        if verbose:
+            print("Executing:", " ".join(command))
+        retcode = subprocess.run(command).returncode
+        if retcode:
+            # Rely on the subprocess printing out any relevant error
+            return retcode
+    finally:
+        if path != args.input:
+            os.remove(path)
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(generate_res())