Serialize the AST reader's mapping from canonical declarations to the

set of (previously-canonical) declaration IDs to the module file, so
that future AST reader instances that load the module know which
declarations are merged. This is important in the fairly tricky case
where a declaration of an entity, e.g.,

  @class X;

occurs before the import of a module that also declares that
entity. We merge the declarations, and record the fact that the
declaration of X loaded from the module was merged into the (now
canonical) declaration of X that we parsed.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147181 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 1 deletions

diff --git a/test/Modules/redecl-merge.m b/test/Modules/redecl-merge.m
index 930e8df6b8..ea04037707 100644
--- a/test/Modules/redecl-merge.m
+++ b/test/Modules/redecl-merge.m
@@ -58,13 +58,18 @@ void test_C3(C3 *c3) {
 C4 *global_C4;
 __import_module__ redecl_merge_left_left;
 
-void test_C4(C4 *c4) {
+void test_C4a(C4 *c4) {
   global_C4 = c4 = get_a_C4();
   accept_a_C4(c4);
 }
 
 __import_module__ redecl_merge_bottom;
 
+void test_C4b() {
+  if (&refers_to_C4) {
+  }
+}
+
 @implementation B
 + (B*)create_a_B { return 0; }
 @end