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* [glibc/release/2.34/master] _Static_assert needs two arguments for compatibility with GCC before 9
@ 2022-11-29  9:04 Florian Weimer
  0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2022-11-29  9:04 UTC (permalink / raw)
  To: glibc-cvs;h=a1c12fdf3f9b8665719835ce8330b3b2e2574b37

commit a1c12fdf3f9b8665719835ce8330b3b2e2574b37
Author: Florian Weimer <>
Date:   Fri Sep 10 13:18:36 2021 +0200

    _Static_assert needs two arguments for compatibility with GCC before 9
    This macro definition enforces two arguments even with newer compilers
    that accept the single-argument form, too.
    Reviewed-by: Carlos O'Donell <>
    (cherry picked from commit c9fef4b7d1d0f2dad192c74f06102752247677a9)

 include/sys/cdefs.h | 7 +++++++
 1 file changed, 7 insertions(+)

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)
 #include <misc/sys/cdefs.h>
 #ifndef _ISOMAC

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