From 5247af0f000a479d6b5fda932f14bb1fae8c70a1 Mon Sep 17 00:00:00 2001
From: millert <millert@openbsd.org>
Date: Sun, 29 Oct 2023 14:26:13 +0000
Subject: [PATCH] Enable ISO C11 APIs when building libc, even with an older
 compiler. Otherwise, the prototypes for timespec_get() and aligned_alloc()
 are not visible.  OK guenther@

---
 lib/libc/include/namespace.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/libc/include/namespace.h b/lib/libc/include/namespace.h
index b42c00e4a10..8503de47bee 100644
--- a/lib/libc/include/namespace.h
+++ b/lib/libc/include/namespace.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: namespace.h,v 1.15 2019/11/25 22:57:28 guenther Exp $	*/
+/*	$OpenBSD: namespace.h,v 1.16 2023/10/29 14:26:13 millert Exp $	*/
 
 #ifndef _LIBC_NAMESPACE_H_
 #define _LIBC_NAMESPACE_H_
@@ -19,6 +19,14 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+/*
+ * ISO C11 or higher is required to build libc.
+ * This must come _before_ sys/cdefs.h is included.
+ */
+#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112
+#define _ISOC11_SOURCE 1
+#endif
+
 /*
  * For explanations of how to use these, see README
  * For explanations of why we use them and how they work, see DETAILS
-- 
2.20.1