gcc/testsuite/gcc.dg/alias-1.c

   1 // { dg-do compile }
   2 // { dg-options "-Wstrict-aliasing=2 -fstrict-aliasing" }
   3
   4 // Copyright (C) 2002 Free Software Foundation, Inc.
   5 // Contributed by Nathan Sidwell 29 Sep 2002 <nathan@codesourcery.com>
   6
   7 // 8083. warn about odd casts
   8
   9 typedef int YYSTYPE;
  10 typedef struct tDefEntry
  11 {
  12   unsigned t;
  13
  14 } tDefEntry;
  15 struct incomplete;
  16
  17
  18 YYSTYPE
  19  addSibMacro(
  20          YYSTYPE  list )
  21  {
  22      tDefEntry** ppT   = (tDefEntry**)&list; // { dg-warning "type-punned pointer will" }
  23
  24      struct incomplete *p = (struct incomplete *)&list; // { dg-warning "type-punning to incomplete" }
  25
  26      return list;
  27  }
  28