1 /* Test for constant expressions: broken optimization with const variables. */ 2 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */ 3 /* { dg-do compile } */ 4 /* { dg-options "-std=iso9899:1999 -O2" } */ 5 /* Note: not using -pedantic since the -std option alone should be enough 6 to give the correct behavior to conforming programs. */ 7 8 static const int ZERO = 0; 9 static const double DZERO = 0; 10 11 int *a; 12 int b; 13 long *c; 14 15 /* Assertion that n is a constant zero: so the conditional expression 16 has type 'int *' instead of 'void *'. 17 */ 18 #define ASSERT_NPC(n) (b = *(1 ? a : (n))) 19 /* Assertion that n is not a constant zero: so the conditional 20 expressions has type 'void *' instead of 'int *'. 21 */ 22 #define ASSERT_NOT_NPC(n) (c = (1 ? a : (void *)(__SIZE_TYPE__)(n))) 23 24 void foo(void)25foo (void) 26 { 27 ASSERT_NPC (0); 28 ASSERT_NOT_NPC (ZERO); 29 ASSERT_NPC (0 + 0); 30 ASSERT_NOT_NPC (ZERO + 0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 31 ASSERT_NOT_NPC (ZERO + ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 32 ASSERT_NPC (+0); 33 ASSERT_NOT_NPC (+ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 34 ASSERT_NPC (-0); 35 ASSERT_NOT_NPC (-ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 36 ASSERT_NPC ((char) 0); 37 ASSERT_NOT_NPC ((char) ZERO); 38 ASSERT_NPC ((int) 0); 39 ASSERT_NOT_NPC ((int) ZERO); 40 ASSERT_NPC ((int) 0.0); 41 ASSERT_NOT_NPC ((int) DZERO); 42 ASSERT_NOT_NPC ((int) +0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 43 ASSERT_NOT_NPC ((int) (0.0+0.0)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 44 ASSERT_NOT_NPC ((int) (double)0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 45 } 46