gcc/testsuite/gcc.dg/tree-ssa/attr-alias.c

   1 /* { dg-do compile } */
   2 /* { dg-require-alias "" } */
   3 /* { dg-require-weak "" } */
   4 /* { dg-options "-O2 -fdump-tree-optimized -std=gnu89" } */
   5 void abort (void);
   6 __attribute__ ((weak))
   7 int test()
   8 {
   9    return 0;
  10 }
  11 static int test2() __attribute__ ((alias("test")));
  12 static int test1() __attribute__ ((weakref)) __attribute__ ((alias("test2")));
  13 static int test4() __attribute__ ((weakref)) __attribute__ ((alias("test")));
  14 main()
  15 {
  16   test();
  17   test2();
  18   test3();
  19   test4();
  20 }
  21
  22 /* calls to test1 and test2 can be inlined and optmized away. Calls
  23    to test and test4 are overwritable.  */
  24
  25 /* { dg-final { scan-tree-dump-times "  test " 1 "optimized" } } */
  26 /* { dg-final { scan-tree-dump-times "  test4 " 1 "optimized" } } */
  27 /* { dg-final { scan-tree-dump-not "  test1 " "optimized" } } */
  28 /* { dg-final { scan-tree-dump-not "  test2 " "optimized" } } */