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* [glibc/maskray/unnest] _Static_assert needs two arguments for compatibility with GCC before 9
@ 2021-09-23  0:44 Fangrui Song
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From: Fangrui Song @ 2021-09-23  0:44 UTC (permalink / raw)
  To: glibc-cvs

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c9fef4b7d1d0f2dad192c74f06102752247677a9

commit c9fef4b7d1d0f2dad192c74f06102752247677a9
Author: Florian Weimer <fweimer@redhat.com>
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 <carlos@redhat.com>

Diff:
---
 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)
+#endif
+
 #include <misc/sys/cdefs.h>
 
 #ifndef _ISOMAC


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