From 5e22aee79f9d02ac37f40f1d18f5696114c3c3c9 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 16 May 2017 09:23:52 -0700
Subject: manywarnings: update for GCC 7

* build-aux/gcc-warning.spec:
* m4/manywarnings.m4 (gl_MANYWARN_ALL_GCC):
Add GCC 7 warnings, notably -Wimplicit-fallthrough=5, which
requires a non-comment fallthrough attribute.  This is a bit
cleaner than the comment versions.
* lib/strftime.c, lib/dfa.c, lib/fnmatch.c, lib/mbrtowc.c:
* lib/vasnprintf.c, tests/macros.h (FALLTHROUGH): New macro.
Use it whenever one switch case falls through into the next.
---
 lib/vasnprintf.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'lib/vasnprintf.c')

diff --git a/lib/vasnprintf.c b/lib/vasnprintf.c
index 839f79060..9c2af0e45 100644
--- a/lib/vasnprintf.c
+++ b/lib/vasnprintf.c
@@ -118,6 +118,14 @@
 # include "fpucw.h"
 #endif
 
+#ifndef FALLTHROUGH
+# if __GNUC__ < 7
+#  define FALLTHROUGH ((void) 0)
+# else
+#  define FALLTHROUGH __attribute__ ((__fallthrough__))
+# endif
+#endif
+
 /* Default parameters.  */
 #ifndef VASNPRINTF
 # if WIDE_CHAR_VERSION
@@ -4837,7 +4845,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                     *fbp++ = 'l';
 # endif
 #endif
-                    /*FALLTHROUGH*/
+                    FALLTHROUGH;
                   case TYPE_LONGINT:
                   case TYPE_ULONGINT:
 #if HAVE_WINT_T
-- 
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