git: 13ba63a5f5b6 - stable/15 - libc: Suppress <stdalign.h> content for C23 and later

From: Robert Clausecker <fuz_at_FreeBSD.org>
Date: Thu, 16 Jul 2026 17:58:05 UTC 
The branch stable/15 has been updated by fuz:

URL: https://cgit.FreeBSD.org/src/commit/?id=13ba63a5f5b699a8ba1de8eccb878d527e3d5e10

commit 13ba63a5f5b699a8ba1de8eccb878d527e3d5e10
Author:     Faraz Vahedi <kfv@kfv.io>
AuthorDate: 2026-05-20 10:06:16 +0000
Commit:     Robert Clausecker <fuz@FreeBSD.org>
CommitDate: 2026-07-16 17:56:48 +0000

    libc: Suppress <stdalign.h> content for C23 and later
    
    C23 deprecates <stdalign.h> and specifies that the header shall
    provide no content (ยง7.15.1).
    
    Signed-off-by:  Faraz Vahedi <kfv@kfv.io>
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/2223
    MFC after:      1 month
    Reviewed by:    imp, fuz
    
    (cherry picked from commit 694baf88c2ae5957fdb24ed163993109987e1ef9)
---
 include/stdalign.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/stdalign.h b/include/stdalign.h
index 00ae5677f449..1b439565f588 100644
--- a/include/stdalign.h
+++ b/include/stdalign.h
@@ -26,6 +26,8 @@
  * SUCH DAMAGE.
  */
 
+#if __STDC_VERSION__ < 202311L
+
 #ifndef __alignas_is_defined
 #define	__alignas_is_defined	1
 
@@ -45,3 +47,5 @@
 #endif
 
 #endif /* !__alignof_is_defined */
+
+#endif /* __STDC_VERSION__ < 202311L */