Use error-on-mismatch policy for PAuth module flags.

This agrees with Clang, and avoids an error when using LTO with mixed
C/Rust. LLVM considers different behaviour flags to be a mismatch,
even when the flag value itself is the same.

This also makes the flag setting explicit for all uses of
LLVMRustAddModuleFlag.

1 files changed, 6 insertions, 3 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index c21e4acbefe..dcd6327c92f 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -722,9 +722,12 @@ extern "C" bool LLVMRustIsRustLLVM() {
 #endif
 }
 
-extern "C" void LLVMRustAddModuleFlag(LLVMModuleRef M, const char *Name,
-                                      uint32_t Value) {
-  unwrap(M)->addModuleFlag(Module::Warning, Name, Value);
+extern "C" void LLVMRustAddModuleFlag(
+    LLVMModuleRef M,
+    Module::ModFlagBehavior MergeBehavior,
+    const char *Name,
+    uint32_t Value) {
+  unwrap(M)->addModuleFlag(MergeBehavior, Name, Value);
 }
 
 extern "C" LLVMValueRef LLVMRustMetadataAsValue(LLVMContextRef C, LLVMMetadataRef MD) {