llvm-gcc-4.2/gcc/testsuite/gcc.dg/cpp/trad/macroargs.c

/* Test that whitespace in arguments is preserved, and that each
   newline in macro arguments become a space.  */

/* { dg-do run } */

#define f(x, y) "x y"
#define g(x) x

extern void abort (void);

int main ()
{
  const char *str1 = f( foo ,bar);
  const char *str2 = f(
foo
,bar);

  if (strcmp (str1, " foo  bar"))
    abort ();

  if (strcmp (str1, str2))
    abort ();

  /* Verify that quoted state is preserved over a newline.  */
  if (strcmp (g /* { dg-bogus "unterminated 2" } */ ("1
, 2"), "1 , 2"))	
    abort ();

  return 0;
}