The "-Wimplicit-fallthrough=2" option was introduced into gcc 7.0, it was
enabled when the cross compiler gcc is greater than 7.0, but for the host
side buildtools/pmdinfogen, if the native is older than 7.0, it should not
be enabled.
The fix is to differentiate the host gcc Werror options from the cross gcc.
gcc -Wp,-MD,./.pmdinfogen.o.d.tmp -W -Wall -Wstrict-prototypes
-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition
-Wpointer-arith -Wcast-align -Wnested-externs -Wcast-qual
-Wformat-nonliteral -Wformat-security -Wundef -Wwrite-strings -Wdeprecated
-Werror -Wimplicit-fallthrough=2 -Dbbb -Wno-format-truncation -g
-I/home/gavin/arm_repo/dpdk/build/include -o pmdinfogen.o -c
~/dpdk/buildtools/pmdinfogen/pmdinfogen.c gcc: error:
unrecognized command line option ‘-Wimplicit-fallthrough=2’
~/dpdk/mk/internal/rte.compile-pre.mk:114: recipe for target 'pmdinfogen.o'
failed make[3]: *** [pmdinfogen.o] Error 1
Fixes: ced3e6f8 ("mk: adjust gcc flags for new gcc 7 warnings")
Cc: sta...@dpdk.org
Signed-off-by: Gavin Hu <gavin...@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com>
Reviewed-by: Steve Capper <steve.cap...@arm.com>
Reviewed-by: Thomas Monjalon <tho...@monjalon.net>
Reviewed-by: Bruce Richardson <bruce.richard...@intel.com>
---
buildtools/pmdinfogen/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/buildtools/pmdinfogen/Makefile b/buildtools/pmdinfogen/Makefile
index bf07b6f..8ee6427 100644
--- a/buildtools/pmdinfogen/Makefile
+++ b/buildtools/pmdinfogen/Makefile
@@ -41,7 +41,7 @@ HOSTAPP = dpdk-pmdinfogen
#
SRCS-y += pmdinfogen.c
-HOST_CFLAGS += $(WERROR_FLAGS) -g
+HOST_CFLAGS += -Wno-implicit-fallthrough $(WERROR_FLAGS) -g
HOST_CFLAGS += -I$(RTE_OUTPUT)/include
include $(RTE_SDK)/mk/rte.hostapp.mk
--
2.1.4
