Module Debugging: Use the clang module signature as the module's dwo_id

when building a module. Clang already records the module signature when
building a skeleton CU to reference a clang module.

Matching the id in the skeleton with the one in the module allows a DWARF
consumer to verify that they found the correct version of the module
without them needing to know about the clang module format.

llvm-svn: 248345

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index ae1f5e7ecfa..72ddf4efc7c 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3453,6 +3453,12 @@ CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
   return NS;
 }
 
+void CGDebugInfo::setDwoId(uint64_t Signature) {
+  assert(TheCU && "no main compile unit");
+  TheCU->setDWOId(Signature);
+}
+
+
 void CGDebugInfo::finalize() {
   // Creating types might create further types - invalidating the current
   // element and the size(), so don't cache/reference them.