clang/test/CodeGen/2008-07-30-redef-of-bitcasted-decl.c

   1 // RUN: %clang_cc1 -std=c89 -emit-llvm -o - %s
   2
   3 /* For posterity, the issue here begins initial "char []" decl for
   4  * s. This is a tentative definition and so a global was being
   5  * emitted, however the mapping in GlobalDeclMap referred to a bitcast
   6  * of this global.
   7  *
   8  * The problem was that later when the correct definition for s is
   9  * emitted we were doing a RAUW on the old global which was destroying
  10  * the bitcast in the GlobalDeclMap (since it cannot be replaced
  11  * properly), leaving a dangling pointer.
  12  *
  13  * The purpose of bar is just to trigger a use of the old decl
  14  * sometime after the dangling pointer has been introduced.
  15  */
  16
  17 char s[];
  18
  19 static void bar(void *db) {
  20   eek(s);
  21 }
  22
  23 char s[5] = "hi";
  24
  25 int foo(void) {
  26   bar(0);
  27 }