Viewing file:  compare4.c (1.32 KB) -rw-r--r--
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/* Test for a bogus warning on comparison between signed and unsigned.
Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 5/13/2001. */
/* { dg-do compile } */
/* { dg-options "-fshow-column -Wsign-compare -fstrict-overflow" } */
extern void bar(void);
int foo(int x, int y, unsigned u)
{
/* A COMPOUND_EXPR is non-negative if the last element is known to
be non-negative. */
if (u < (bar(), -1)) /*{ dg-warning "9:different signedness" "COMPOUND_EXPR" }*/
return x;
if (u < (bar(), 10))
return x;
if ((bar(), 10) < u)
return x;
if (u < (x ? (bar(),bar(),bar(),bar(),x==y) : 10))
return x;
if ((x ? 10 : (bar(),bar(),bar(),bar(),x==y)) < u)
return x;
/* Test an ABS_EXPR, which is by definition non-negative when
-fstrict-overflow is used. */
if (u < __builtin_abs(x))
return x;
if (__builtin_abs(x) < u)
return x;
if (u < (x ? __builtin_abs(x) : 10))
return x;
if ((x ? 10: __builtin_abs(x)) < u)
return x;
/* A MODIFY_EXPR is non-negative if the new value is known to be
non-negative. */
if (u < (x = -1)) /* { dg-warning "9:different signedness" "MODIFY_EXPR" } */
return x;
if (u < (x = 10))
return x;
if ((x = 10) < u)
return x;
if (u < (x = (y ? (x==y) : 10)))
return x;
if ((x = (y ? 10 : (x==y))) < u)
return x;
return 0;
}
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