Add warning flags for GCC 7.1.0 compiler.

Sponsored by:	DARPA, AFRL

share/mk/bsd.sys.mk

@@ -145,6 +145,23 @@ CWARNFLAGS+=	-Wno-error=misleading-indentation	\
 		-Wno-error=unused-const-variable
 .endif
 
+# GCC 7.1.0
+.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 70100
+CWARNFLAGS+=	-Wno-error=deprecated			\
+		-Wno-error=pointer-compare		\
+		-Wno-error=format-truncation		\
+		-Wno-error=implicit-fallthrough		\
+		-Wno-error=expansion-to-defined		\
+		-Wno-error=int-in-bool-context		\
+		-Wno-error=bool-operation		\
+		-Wno-error=format-overflow		\
+		-Wno-error=stringop-overflow		\
+		-Wno-error=memset-elt-size		\
+		-Wno-error=int-in-bool-context		\
+		-Wno-error=unused-const-variable	\
+		-Wno-error=nonnull
+.endif
+
 # How to handle FreeBSD custom printf format specifiers.
 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
 FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__