gcc/testsuite/c-c++-common/Wshift-overflow-5.c

   1 /* PR c++/55095 */
   2 /* { dg-do compile { target int32 } } */
   3 /* { dg-options "-O -Wshift-overflow=2" } */
   4 /* { dg-additional-options "-std=c++11" { target c++ } } */
   5
   6 #define INTM1 (sizeof (int) * __CHAR_BIT__ - 1)
   7 #define LLONGM1 (sizeof (long long) * __CHAR_BIT__ - 1)
   8
   9 int i1 = 1 << INTM1; /* { dg-warning "requires 33 bits to represent" } */
  10 unsigned u1 = 1 << INTM1; /* { dg-warning "requires 33 bits to represent" } */
  11 long long int l1 = 1LL << LLONGM1; /* { dg-warning "requires 65 bits to represent" } */