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Include <threads.h> if possible to get thread_local definition

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IN C23, thread_local is a reserved keyword and we shall therefore
do nothing to redefine it. glibc has it defined for older standard
version with the right conditions.

v2 by Yu Watanabe:
Move the definition to missing_threads.h like the way we define e.g.
missing syscalls or missing definitions, and include it by the users.

Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>
This commit is contained in:
Cristian Rodríguez
2023-01-03 17:52:08 +00:00
committed by Yu Watanabe
parent efcde781de
commit 5545f336fd
22 changed files with 35 additions and 14 deletions
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15
src/basic/missing_threads.h Normal file
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
/* If threads.h doesn't exist, then define our own thread_local to match C11's thread_local. */
#if HAVE_THREADS_H
# include <threads.h>
#elif !(defined(thread_local))
/* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
* see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769 */
# if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
# define thread_local _Thread_local
# else
# define thread_local __thread
# endif
#endif