Description of problem:
Compiling this little program as a PIE leads to problems on x86-64:

$ cat w.c
__thread int a;

int
main(void)
{
  return a;
}

Using

  gcc -o w -g -O2 -pie -fpie w.c

one sees

/usr/bin/ld: /tmp/ccU3JvLp.o: relocation R_X86_64_TPOFF32 against `a' can not
be used when making a shared object; recompile with -fPIC

It works with "-fpic -ftls-model=initial-exec", but not with "-fpic -ftls-model=local-exec".

Based on http://sourceware.org/bugzilla/show_bug.cgi?id=10434 and the two-line patch there (http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/bfd/elf64-x86-64.c.diff?cvsroot=src&r1=1.178&r2=1.179), it's a simple mistake where the linker allows local-exec only for non-PIC (!info->shared) instead of testing for executable vs shared (info->executable).

Version-Release number of selected component (if applicable):
binutils-2.17.50.0.6-14.el5

How reproducible:
100%

Steps to Reproduce:
1. See above.
  
Actual results:
Binaries that use TLS cannot be hardened with PIE.

Expected results:
Hardened binaries can use TLS.

Additional info:
Reproduced with QEMU 1.0-rc3.