1 /* Test for constant expressions: broken optimization with const variables. */ 2 /* Reference: ISO 9989:1990 6.5.15 */ 3 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */ 4 /* { dg-do compile } */ 5 /* { dg-options "-std=iso9899:1990 -O2" } */ 6 /* Note: not using -pedantic since the -std option alone should be enough 7 to give the correct behavior to conforming programs. */ 8 9 static const int ZERO = 0; 10 static const double DZERO = 0; 11 12 int *a; 13 int b; 14 long *c; 15 16 /* Assertion that n is a constant zero: so the conditional expression 17 has type 'int *' instead of 'void *'. 18 */ 19 #define ASSERT_NPC(n) (b = *(1 ? a : (n))) 20 /* Assertion that n is not a constant zero: so the conditional 21 expressions has type 'void *' instead of 'int *'. 22 */ 23 #define ASSERT_NOT_NPC(n) (c = (1 ? a : (void *)(__SIZE_TYPE__)(n))) 24 25 void foo(void)26foo (void) 27 { 28 ASSERT_NPC (0); 29 ASSERT_NOT_NPC (ZERO); 30 ASSERT_NPC (0 + 0); 31 ASSERT_NOT_NPC (ZERO + 0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 32 ASSERT_NOT_NPC (ZERO + ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 33 ASSERT_NPC (+0); 34 ASSERT_NOT_NPC (+ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 35 ASSERT_NPC (-0); 36 ASSERT_NOT_NPC (-ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 37 ASSERT_NPC ((char) 0); 38 ASSERT_NOT_NPC ((char) ZERO); 39 ASSERT_NPC ((int) 0); 40 ASSERT_NOT_NPC ((int) ZERO); 41 ASSERT_NPC ((int) 0.0); 42 ASSERT_NOT_NPC ((int) DZERO); 43 ASSERT_NOT_NPC ((int) +0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 44 ASSERT_NOT_NPC ((int) (0.0+0.0)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 45 ASSERT_NOT_NPC ((int) (double)0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */ 46 } 47