[Bug c/53095] New: std=gnu99 atof x86

[JoaquinMonleon at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53095

             Bug #: 53095
           Summary: std=gnu99 atof x86
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: joaquinmonl...@gmail.com


Created attachment 27227
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27227
the preprocessed file (*.i*) that triggers the bug

/*

Exact version of GCC: That I know that version 4.3, 4.6 and 4.7 has this bug.

System Type: x86_32, i686, 32BITS Intel architecture. It don't occurs in 64 bit
intel architectures.

Options given when GCC was configured/build: The error happen when you use
-std=gnu99 ¡¡BY DEFAULT :O!! standar or -std=gnu89, but not when you use other
standar like -std=c99

The complete command line that triggers the bug: "gcc main.c -o main"

The compiler output (error messages, warnings, etc.): None.

the preprocessed file (*.i*) that triggers the bug, generated by adding
-save-temps to the complete compilation command, or, in the case of a bug
report for the GNAT front end, a complete set of source files (see below): As
attachment

Thank's I love GNU & your work a million of thanks.

*/

#include <stdio.h>
#include <stdlib.h>

int main(){

    char *cadena = "-25.9";

    //USING A TEMP VARIABLE
    double d = atof(cadena) * 10;
    short s1 = (short) d;
    printf("%d\n",s1); //I GET -259

    //WITHOUT A TEMP VARIABLE
    short s2 = atof(cadena) * 10;
    printf("%d\n",s2); //I GET -258????????????????????????????? WTF?
}