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Do not define static_assert or thread_local in headers for C2x
C2x makes static_assert and thread_local into keywords, removing the definitions as macros in assert.h and threads.h. Thus, disable those macros in those glibc headers for C2x. The disabling is done based on a combination of language version and __GNUC_PREREQ, *not* based on __GLIBC_USE (ISOC2X), on the principle that users of the header (when requesting C11 or later APIs - not assert.h for C99 and older API versions) should always have the names static_assert or thread_local available after inclusion of the header, whether as a keyword or as a macro. Thus, when using a compiler without the keywords (whether an older compiler, possibly in C2x mode, or _GNU_SOURCE with any compiler but in an older language mode, for example) the macros should be defined, even when C2x APIs have been requested. The __GNUC_PREREQ conditionals here may well need updating with the versions of other compilers that gained support for these keywords in C2x mode. Tested for x86_64.
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@ -135,7 +135,11 @@ __END_DECLS
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#endif /* NDEBUG. */
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#if defined __USE_ISOC11 && !defined __cplusplus
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#if (defined __USE_ISOC11 \
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&& (!defined __STDC_VERSION__ \
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|| __STDC_VERSION__ <= 201710L \
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|| !__GNUC_PREREQ (13, 0)) \
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&& !defined __cplusplus)
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# undef static_assert
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# define static_assert _Static_assert
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#endif
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@ -27,7 +27,9 @@ __BEGIN_DECLS
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#include <bits/thread-shared-types.h>
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#include <bits/types/struct_timespec.h>
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#ifndef __cplusplus
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#if (!defined __STDC_VERSION__ \
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|| __STDC_VERSION__ <= 201710L \
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|| !__GNUC_PREREQ (13, 0)) && !defined __cplusplus
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# define thread_local _Thread_local
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#endif
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