PATCH: Enable pthreads on IRIX 6 (PR bootstrap/3456)

[Rainer Orth]

Benjamin Kosnik writes:

> I think you are missing some, although in general your approach seems
> fine to me.
> 
> ./18_support/bad_exception/23591_thread-1.c

This is currently linux-only.

> ./22_locale/locale/cons/12658_thread-2.cc
> ./22_locale/locale/cons/12658_thread-1.cc

I've got those.

> ./ext/mt_allocator/22309_thread.cc

Again linux-only.

> ./ext/mt_allocator/check_deallocate_null_thread.cc
> ./ext/mt_allocator/deallocate_global_thread-1.cc
> ./ext/mt_allocator/deallocate_global_thread-3.cc
> ./ext/mt_allocator/deallocate_local_thread-1.cc
> ./ext/mt_allocator/deallocate_local_thread-3.cc

No target restrictions.

> ./ext/mt_allocator/deallocate_local_thread-5.cc
> ./ext/mt_allocator/deallocate_local_thread-7.cc

Require __cxa_atexit.

> ./thread/pthread1.cc
> ./thread/pthread2.cc
> ./thread/pthread3.cc
> ./thread/pthread4.cc
> ./thread/pthread5.cc
> ./thread/pthread6.cc
> ./thread/pthread7-rope.cc

Already included.

	Rainer

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Rainer Orth, Faculty of Technology, Bielefeld University