1 files changed, 28 insertions, 0 deletions
diff --git a/clang/test/CodeGen/2008-07-30-redef-of-bitcasted-decl.c b/clang/test/CodeGen/2008-07-30-redef-of-bitcasted-decl.c
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+++ b/clang/test/CodeGen/2008-07-30-redef-of-bitcasted-decl.c
@@ -0,0 +1,28 @@
+// RUN: %clang_cc1 -emit-llvm -o - %s
+// <rdar://problem/6108358>
+
+/* For posterity, the issue here begins initial "char []" decl for
+ * s. This is a tentative definition and so a global was being
+ * emitted, however the mapping in GlobalDeclMap referred to a bitcast
+ * of this global.
+ *
+ * The problem was that later when the correct definition for s is
+ * emitted we were doing a RAUW on the old global which was destroying
+ * the bitcast in the GlobalDeclMap (since it cannot be replaced
+ * properly), leaving a dangling pointer.
+ *
+ * The purpose of bar is just to trigger a use of the old decl
+ * sometime after the dangling pointer has been introduced.
+ */
+
+char s[];
+
+static void bar(void *db) {
+  eek(s);
+}
+
+char s[5] = "hi";
+
+int foo() {
+  bar(0);
+}