LU-15492 build: fallthrough macro for pre/post gcc-7

[fs/lustre-release.git] / lnet / include / lnet / lib-lnet.h

diff --git a/lnet/include/lnet/lib-lnet.h b/lnet/include/lnet/lib-lnet.h
index 58f03fa..fba7de0 100644 (file)
--- a/lnet/include/lnet/lib-lnet.h
+++ b/lnet/include/lnet/lib-lnet.h
@@ -110,7 +110,11 @@ extern struct lnet the_lnet;                       /* THE network */
 #endif
 
 #ifndef fallthrough
-#define fallthrough do {} while (0)  /* fallthrough */
+# if defined(__GNUC__) && __GNUC__ >= 7
+#  define fallthrough  __attribute__((fallthrough)) /* fallthrough */
+# else
+#  define fallthrough do {} while (0)  /* fallthrough */
+# endif
 #endif
 
 int choose_ipv4_src(__u32 *ret,