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-rw-r--r--src/lisp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/lisp.h b/src/lisp.h
index 0281c483e32..1e41e2064c9 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -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