Module Debug Info: Emit namespaced C++ forward decls in the correct module.

The AST merges NamespaceDecls, but for module debug info it is
important to put a namespace decl (or rather its children) into the
correct (sub-)module, so we need to use the parent module of the decl
that triggered this namespace to be serialized as a second key when
looking up DINamespace nodes.

rdar://problem/29339538

llvm-svn: 302840

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/test/Modules/Inputs/DebugInfoNamespace/A.h b/clang/test/Modules/Inputs/DebugInfoNamespace/A.h
new file mode 100644
index 00000000000..dc5a1cd26ab
--- /dev/null
+++ b/clang/test/Modules/Inputs/DebugInfoNamespace/A.h
@@ -0,0 +1,3 @@
+namespace N {
+  struct A {};
+}