[llvm-windres] Pass user preprocessor arguments before the input filename (#75389)

If passing the windres option --preprocessor, the default arguments "-E
-xc -DRC_INVOKED" aren't passed. If these are passed explicitly by the
user via --preprocessor-arg instead, we need to make sure that "-xc" is
passed before the input filename, as this compiler/preprocessor option
only has an effect on input files that follow it.

This fixes one of the issues with llvm-windres observed in
https://github.com/msys2/MINGW-packages/pull/19157.

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/tools/llvm-rc/llvm-rc.cpp b/llvm/tools/llvm-rc/llvm-rc.cpp
index b955347f..4375697 100644
--- a/llvm/tools/llvm-rc/llvm-rc.cpp
+++ b/llvm/tools/llvm-rc/llvm-rc.cpp
@@ -253,11 +253,11 @@ void preprocess(StringRef Src, StringRef Dst, const RcOptions &Opts,
     for (const auto &S : Opts.PreprocessCmd)
       Args.push_back(S);
   }
+  for (const auto &S : Opts.PreprocessArgs)
+    Args.push_back(S);
   Args.push_back(Src);
   Args.push_back("-o");
   Args.push_back(Dst);
-  for (const auto &S : Opts.PreprocessArgs)
-    Args.push_back(S);
   if (Opts.PrintCmdAndExit || Opts.BeVerbose) {
     for (const auto &A : Args) {
       outs() << " ";