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Port alignas definition to C23

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* src/lisp.h (alignas): C23 is removing the __alignas_is_defined
macro, so do not rely on it. Instead, do not define alignas if C23
or later, or if C++11 or later.
This commit is contained in:
Paul Eggert 2022-09-13 12:41:34 -05:00
parent 9d4c135046
commit 49419912f2
1 changed files with 2 additions and 1 deletions
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src/lisp.h
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@ -245,7 +245,8 @@ DEFINE_GDB_SYMBOL_BEGIN (EMACS_INT, VALMASK)
DEFINE_GDB_SYMBOL_END (VALMASK)
/* Ignore 'alignas' on compilers lacking it. */
#if !defined alignas && !defined __alignas_is_defined
#if (!defined alignas && !defined __alignas_is_defined \
&& __STDC_VERSION__ < 202311 && __cplusplus < 201103)
# define alignas(a)
#endif