[Bug regression/43356] New: Wrong code and misleading warning "statement with no effect"

[ktietz at gcc dot gnu dot org]

The following code compiled on 4.4.x works without problems, but by using gcc
4.5 it produces for -O0 wrong code, and for -O >= 1 correct code but the
strange warning (with -Wall option enabled) 'modf.c:9:1: warning: statement
with no effect.'.

#include <stdio.h>
#include <math.h>

int main( void )
{
double d = 10.5;
double i = 100.0;

modf( d, &i );

printf( "%f %f\n", d, i );

return 0;
}


-- 
           Summary: Wrong code and misleading warning "statement with no
                    effect"
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ktietz at gcc dot gnu dot org
GCC target triplet: x86_64-*-mingw*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43356