1 /* Test for a bogus warning on comparison between signed and unsigned. 2 Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 5/13/2001. */ 3 4 /* { dg-do compile } */ 5 /* { dg-options "-Wsign-compare" } */ 6 7 extern void bar(void); 8 9 int foo(int x, int y, unsigned u) 10 { 11 /* A COMPOUND_EXPR is non-negative if the last element is known to 12 be non-negative. */ 13 if (u < (bar(), -1)) /*{ dg-warning "signed and unsigned" "COMPOUND_EXPR" }*/ 14 return x; 15 if (u < (bar(), 10)) 16 return x; 17 if ((bar(), 10) < u) 18 return x; 19 if (u < (x ? (bar(),bar(),bar(),bar(),x==y) : 10)) 20 return x; 21 if ((x ? 10 : (bar(),bar(),bar(),bar(),x==y)) < u) 22 return x; 23 24 /* Test an ABS_EXPR, which is by definition non-negative. */ 25 if (u < __builtin_abs(x)) 26 return x; 27 if (__builtin_abs(x) < u) 28 return x; 29 if (u < (x ? __builtin_abs(x) : 10)) 30 return x; 31 if ((x ? 10: __builtin_abs(x)) < u) 32 return x; 33 34 /* A MODIFY_EXPR is non-negative if the new value is known to be 35 non-negative. */ 36 if (u < (x = -1)) /* { dg-warning "signed and unsigned" "MODIFY_EXPR" } */ 37 return x; 38 if (u < (x = 10)) 39 return x; 40 if ((x = 10) < u) 41 return x; 42 if (u < (x = (y ? (x==y) : 10))) 43 return x; 44 if ((x = (y ? 10 : (x==y))) < u) 45 return x; 46 47 return 0; 48 } 49