gcc/testsuite/gcc.c-torture/compile/981001-4.c


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#define P(a,b) P1(a,b)
#define P1(a,b) a##b

#define ONCE(x, y) (x ?: (x = y()))
#define PREFIX

extern int P(PREFIX, init) (void);

int
fun(void)
{
  static int memo;
  return ONCE(memo, P(PREFIX, init));
}