From a12c7fd184e8a8251b1a3e9c0f681873995ec204 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Fri, 21 Jun 2019 04:35:41 +0200
Subject: threads-h: Define 'thread_local' if and only it actually works.

* 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'.
---
 modules/threads-h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'modules/threads-h')

diff --git a/modules/threads-h b/modules/threads-h
index 238955c6b5..c5af53e812 100644
--- a/modules/threads-h
+++ b/modules/threads-h
@@ -50,6 +50,7 @@ threads.h: threads.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(_NORETURN_H
 	      -e 's/@''GNULIB_MTX''@/$(GNULIB_MTX)/g' \
 	      -e 's/@''GNULIB_THRD''@/$(GNULIB_THRD)/g' \
 	      -e 's/@''GNULIB_TSS''@/$(GNULIB_TSS)/g' \
+	      -e 's|@''HAVE_THREAD_LOCAL''@|$(HAVE_THREAD_LOCAL)|g' \
 	      -e 's|@''BROKEN_THRD_START_T''@|$(BROKEN_THRD_START_T)|g' \
 	      -e 's|@''REPLACE_THRD_CREATE''@|$(REPLACE_THRD_CREATE)|g' \
 	      -e 's|@''REPLACE_THRD_CURRENT''@|$(REPLACE_THRD_CURRENT)|g' \
@@ -65,6 +66,7 @@ Include:
 <threads.h>
 
 Link:
+$(LIBTHREADLOCAL) if you use the thread_local macro
 
 License:
 LGPLv2+
-- 
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