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From: Philipp Psurek <philipp.psurek@gmail.com>
Date: Sat, 03 Jun 2017 12:31:53 +0200
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Subject: Re: [B.A.T.M.A.N.] [PATCH] batctl: suppress implicit-fallthrough
 compiler warning
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To: Simon Wunderlich <sw@simonwunderlich.de>, b.a.t.m.a.n@lists.open-mesh.org

OK, sorry for the many posts ... there was some trouble recognizing the
used compiler with the last patch. This now really do the work:

diff --git a/Makefile b/Makefile
index 6bebb7d..7123d83 100755
--- a/Makefile
+++ b/Makefile
@@ -101,6 +101,11 @@ MKDIR ?= mkdir -p
 COMPILE.c = $(Q_CC)$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c
 LINK.o = $(Q_LD)$(CC) $(CFLAGS) $(LDFLAGS) $(TARGET_ARCH)
 
+# Check for GCC >=7
+ifeq ($(shell $(CC) -x c++ --std=c++17 -E -P - <<< __cplusplus),201703L)
+	CFLAGS += -Wimplicit-fallthrough=2
+endif
+
 # standard install paths
 PREFIX = /usr/local
 SBINDIR = $(PREFIX)/sbin