[Bug libc/14519] New: Incorrect sign of zero on strtod underflow

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14519

             Bug #: 14519
           Summary: Incorrect sign of zero on strtod underflow
           Product: glibc
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


strtod sometimes returns positive zero on underflow when it should return
negative zero.  Testcase:

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

int
main (void)
{
  printf ("%a\n", atof ("-0x0.7p-1074"));
  return 0;
}

Testing a patch.

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