Can we assume __thread support?

[Florian Weimer]

On 10/15/2015 04:42 PM, H.J. Lu wrote:
> On Thu, Oct 15, 2015 at 7:05 AM, Florian Weimer <fweimer@redhat.com> wrote:
>> Can we assume that GCC supports __thread?
>>
>> This would allow some cleanups in the malloc subdirectory in particular.
>>
> 
> We should.

We have this:

if test "$libc_cv_gcc___thread" = no; then
  AC_MSG_ERROR([support for the __thread keyword is required])
fi

since:

commit 3ce1f2959437e952b9db4eaeed2407424f11a4d1
Author: Ulrich Drepper <drepper@gmail.com>
Date:   Sat Sep 10 14:34:15 2011 -0400

    Cleanup of configuration options

    Make several tool features mandatory and simplify the code.

The question is whether this is just a syntactic thing, or if we can
assume that __thread support in binutils works.  We also have test cases
for __thread-related things, and I can't see that they are conditional
on anything or XFAILed.

This is mainly a Hurd/NaCl question anyway, the NPTL-based platforms
support it.

Florian