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* m4/threads.m4 (gl_THREAD_LOCAL_DEFINITION): New macro.
(gl_THREADS_H): Define _Thread_local to __thread also for ARM C, IBM C,
Oracle Solaris Studio C. Compile a simple program, to see whether
_Thread_local basically works. Set HAVE_THREAD_LOCAL and LIBTHREADLOCAL.
(gl_THREADS_H_DEFAULTS): Initialize HAVE_THREAD_LOCAL.
* lib/threads.in.h (thread_local): Undefine if it does not work.
* modules/threads-h (Makefile.am): Substitute HAVE_THREAD_LOCAL.
(Link): Mention LIBTHREADLOCAL.
* tests/test-threads.c: Don't check that thread_local is defined.
* tests/test-thread_local.c: New file.
* modules/threads-h-tests (Files): Add it and macros.h.
(Depends-on): Add thrd and stdint.
(configure.ac): Test whether 'alarm' is declared.
(Makefile.am): Arrange to build and link test-thread_local.
* doc/posix-headers/threads.texi: Mention the platforms that don't
support 'thread_local'.
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