1 // RUN: %clang_cc1 -emit-llvm -o - %s
2 // <rdar://problem/6108358>
3
4 /* For posterity, the issue here begins initial "char []" decl for
5 * s. This is a tentative definition and so a global was being
6 * emitted, however the mapping in GlobalDeclMap referred to a bitcast
7 * of this global.
8 *
9 * The problem was that later when the correct definition for s is
10 * emitted we were doing a RAUW on the old global which was destroying
11 * the bitcast in the GlobalDeclMap (since it cannot be replaced
12 * properly), leaving a dangling pointer.
13 *
14 * The purpose of bar is just to trigger a use of the old decl
15 * sometime after the dangling pointer has been introduced.
16 */
17
18 char s[];
19
bar(void * db)20 static void bar(void *db) {
21 eek(s);
22 }
23
24 char s[5] = "hi";
25
foo()26 int foo() {
27 bar(0);
28 }
29