From bd27ea43e9972d1c8ae794441fd2db83a8d896fc Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@opensourcerouting.org>
Date: Wed, 15 Aug 2018 05:49:29 +0200
Subject: [PATCH] build: wrap "fallthrough" attr

This generates a warning on gcc versions before 7.0.

Signed-off-by: David Lamparter <equinox@diac24.net>
---
 lib/compiler.h               | 9 +++++++++
 tests/bgpd/test_capability.c | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/compiler.h b/lib/compiler.h
index b19c33f65e..24b8fafd10 100644
--- a/lib/compiler.h
+++ b/lib/compiler.h
@@ -24,6 +24,9 @@
 #if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 5)
 #  define _RET_NONNULL    , returns_nonnull
 #endif
+#if __has_attribute(fallthrough)
+#  define _FALLTHROUGH __attribute__((fallthrough));
+#endif
 # define _CONSTRUCTOR(x)  constructor(x)
 #elif defined(__GNUC__)
 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
@@ -34,6 +37,9 @@
 #  define _DESTRUCTOR(x)  destructor(x)
 #  define _ALLOC_SIZE(x)  alloc_size(x)
 #endif
+#if __GNUC__ >= 7
+#  define _FALLTHROUGH __attribute__((fallthrough));
+#endif
 #endif
 
 #ifdef __sun
@@ -55,6 +61,9 @@
 #ifndef _ALLOC_SIZE
 # define _ALLOC_SIZE(x)
 #endif
+#ifndef _FALLTHROUGH
+#define _FALLTHROUGH
+#endif
 
 /*
  * for warnings on macros, put in the macro content like this:
diff --git a/tests/bgpd/test_capability.c b/tests/bgpd/test_capability.c
index 4612bdc26b..fef7d39ff5 100644
--- a/tests/bgpd/test_capability.c
+++ b/tests/bgpd/test_capability.c
@@ -821,7 +821,7 @@ static void parse_test(struct peer *peer, struct test_segment *t, int type)
 	switch (type) {
 	case CAPABILITY:
 		len += 2; /* to cover the OPT-Param header */
-		__attribute__ ((fallthrough));
+		_FALLTHROUGH
 	case OPT_PARAM:
 		printf("len: %u\n", len);
 		/* peek_for_as4 wants getp at capibility*/
-- 
2.39.5