Fix invalid DWARF for enums when using thinlto

We were setting the same identifier for both the DW_TAG_structure_type
and the DW_TAG_variant_part. This becomes a problem when using thinlto
becauses it uses the identifier as a key for a map of types that is used
to delete duplicates based on the ODR, so one of them is deleted as a
duplicate, resulting in invalid DWARF.

The DW_TAG_variant_part isn't a standalone type, so it doesn't need
an identifier. Fix by omitting its identifier.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index a00417a3629..470cdcdd613 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -723,12 +723,12 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantPart(
     LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
     uint32_t AlignInBits, LLVMRustDIFlags Flags, LLVMMetadataRef Discriminator,
-    LLVMMetadataRef Elements, const char *UniqueId) {
+    LLVMMetadataRef Elements) {
 #if LLVM_VERSION_GE(7, 0)
   return wrap(Builder->createVariantPart(
       unwrapDI<DIDescriptor>(Scope), Name, unwrapDI<DIFile>(File), LineNumber,
       SizeInBits, AlignInBits, fromRust(Flags), unwrapDI<DIDerivedType>(Discriminator),
-      DINodeArray(unwrapDI<MDTuple>(Elements)), UniqueId));
+      DINodeArray(unwrapDI<MDTuple>(Elements))));
 #else
   abort();
 #endif