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-rw-r--r--include/sys/cdefs.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index 6a76160ed4..56adb231aa 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -1,5 +1,12 @@
 #ifndef _SYS_CDEFS_H
 
+/* This is outside of _ISOMAC to enforce that _Static_assert always
+   uses the two-argument form.  This can be removed once the minimum
+   GCC version used to compile glibc is GCC 9.1.  */
+#ifndef __cplusplus
+# define _Static_assert(expr, diagnostic) _Static_assert (expr, diagnostic)
+#endif
+
 #include <misc/sys/cdefs.h>
 
 #ifndef _ISOMAC