1 /* Test for constant expressions: overflow and constant expressions; 2 see also overflow-warn-*.c for some other cases. */ 3 /* Origin: Joseph Myers <joseph@codesourcery.com> */ 4 /* { dg-do compile } */ 5 /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */ 6 7 #include <float.h> 8 #include <limits.h> 9 10 int a = DBL_MAX; /* { dg-warning "overflow in implicit constant conversion" } */ 11 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 10 } */ 12 int b = (int) DBL_MAX; /* { dg-error "overflow" "" } */ 13 unsigned int c = -1.0; /* { dg-warning "overflow in implicit constant conversion" } */ 14 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 13 } */ 15 unsigned int d = (unsigned)-1.0; /* { dg-error "overflow" } */ 16 17 int e = 0 << 1000; /* { dg-warning "shift count" } */ 18 /* { dg-error "constant" "constant" { target *-*-* } 17 } */ 19 int f = 0 << -1; /* { dg-warning "shift count" } */ 20 /* { dg-error "constant" "constant" { target *-*-* } 19 } */ 21 int g = 0 >> 1000; /* { dg-warning "shift count" } */ 22 /* { dg-error "constant" "constant" { target *-*-* } 21 } */ 23 int h = 0 >> -1; /* { dg-warning "shift count" } */ 24 /* { dg-error "constant" "constant" { target *-*-* } 23 } */ 25 26 int b1 = (0 ? (int) DBL_MAX : 0); 27 unsigned int d1 = (0 ? (unsigned int)-1.0 : 0); 28 int e1 = (0 ? 0 << 1000 : 0); 29 int f1 = (0 ? 0 << -1 : 0); 30 int g1 = (0 ? 0 >> 1000 : 0); 31 int h1 = (0 ? 0 >> -1: 0); 32 33 /* Allowed for now, but actually undefined behavior in C99. */ 34 int i = -1 << 0; 35 36 int j[1] = { DBL_MAX }; /* { dg-warning "overflow in implicit constant conversion" } */ 37 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 36 } */ 38 39 int array[2] = { [0 * (INT_MAX + 1)] = 0 }; /* { dg-warning "integer overflow in expression" } */ 40 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 39 } */ 41 42 _Bool k = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */ 43 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 42 } */ 44