[Bug threads/14345] New: TLS doesn't work on Linux/x86

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14345

             Bug #: 14345
           Summary: TLS doesn't work on Linux/x86
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: threads
        AssignedTo: unassigned@sourceware.org
        ReportedBy: hjl.tools@gmail.com
    Classification: Unclassified


On Linux/x86, I got

[hjl@gnu-6 tmp]$ cat x.c
#include <stdio.h>

__thread int x;

int
main ()
{
  x = 0;
  printf ("%d\n", x);
  x = 1;
  printf ("%d\n", x);
  return 0;
}
[hjl@gnu-6 tmp]$ gcc -g x.c
[hjl@gnu-6 tmp]$ gdb a.out 
GNU gdb (GDB) 7.4.50.20120707-cvs
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /tmp/a.out...done.
(gdb) b main
Breakpoint 1 at 0x400520: file x.c, line 8.
(gdb) r
Starting program: /tmp/a.out 

Breakpoint 1, main () at x.c:8
8      x = 0;
(gdb) p x
Cannot find thread-local variables on this target
(gdb)

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