Bug#448723: libc6: strtod("-0", 0) returns +0.0 instead of -0.0

[Vincent Lefevre <vincent@vinc17.org>]

Package: libc6
Version: 2.6.1-6
Severity: normal

In new versions of libc6, strtod("-0", 0) returns +0.0 instead of -0.0
(this bug isn't present in etch).

Discussion:
https://www.opengroup.org/sophocles/show_mail.tpl?CALLER=show_archive.tpl&source=L&listname=austin-group-l&id=11150
https://www.opengroup.org/sophocles/show_mail.tpl?CALLER=show_archive.tpl&source=L&listname=austin-group-l&id=11151
https://www.opengroup.org/sophocles/show_mail.tpl?CALLER=show_archive.tpl&source=L&listname=austin-group-l&id=11156
https://www.opengroup.org/sophocles/show_mail.tpl?CALLER=show_archive.tpl&source=L&listname=austin-group-l&id=11159
https://www.opengroup.org/sophocles/show_mail.tpl?CALLER=show_archive.tpl&source=L&listname=austin-group-l&id=11160

Here's a program from the one written by Glenn Fowler:

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

#define SHOW(f) show (#f,f)

static void show (const char *s, double x)
{
  double y = strtod (s, 0);
  printf ("%-3s %3g %3g\n", s, x, y);
}

int main (void)
{
  SHOW(-0);
  SHOW(-0.);
  return 0;
}

In unstable, I get:

-0    0   0
-0.  -0  -0

instead of:

-0    0  -0
-0.  -0  -0

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-1-686-bigmem (SMP w/2 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.ISO8859-1 (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/bash

Versions of packages libc6 depends on:
ii  libgcc1                       1:4.2.2-3  GCC support library

libc6 recommends no packages.

-- debconf information excluded