[yocto] [meta-dpdk][PATCH] dpdk: Fix exmples and test _FORTIFY_SOURCE build failure

[zhe.he at windriver.com]

From: He Zhe <zhe.he at windriver.com>

When building examples and tests with GCC9, the following errors come up,

 error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
  382 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
      |    ^~~~~~~
cc1: all warnings being treated as errors

dpdk itself already appends -O3 the EXTRA_CFLAGS for some of those cases, but
dpdk.inc overwrites EXTRA_CFLAGS when evoking make. This patches adds it back.

Signed-off-by: He Zhe <zhe.he at windriver.com>
---
 recipes-extended/dpdk/dpdk.inc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/recipes-extended/dpdk/dpdk.inc b/recipes-extended/dpdk/dpdk.inc
index a0e081a..9dcec76 100644
--- a/recipes-extended/dpdk/dpdk.inc
+++ b/recipes-extended/dpdk/dpdk.inc
@@ -106,12 +106,12 @@ do_compile () {
 
 	cd ${S}/examples/
 	oe_runmake EXTRA_LDFLAGS="-L${STAGING_LIBDIR} --hash-style=gnu -fuse-ld=bfd" \
-		   EXTRA_CFLAGS="${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} -I${STAGING_INCDIR}" \
+		   EXTRA_CFLAGS="${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} -O3 -I${STAGING_INCDIR}" \
 		   CROSS="${TARGET_PREFIX}" O="${S}/examples/$@/"
 
 	cd ${S}/test/
 	oe_runmake EXTRA_LDFLAGS="-L${STAGING_LIBDIR} --hash-style=gnu -fuse-ld=bfd" \
-		   EXTRA_CFLAGS="${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} -I${STAGING_INCDIR}" \
+		   EXTRA_CFLAGS="${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} -O3 -I${STAGING_INCDIR}" \
 		   CROSS="${TARGET_PREFIX}" O="${S}/test/$@/"
 }
 
-- 
2.7.4