dpdk: mk: disable warning for packed member pointer

Backport a patch from upstream to fix the following build failure.

x86_64-native-linuxapp-gcc/include/rte_ether.h:178:2: error:
converting a packed 'const struct ether_addr' pointer (alignment 1) to a 'unaligned_uint16_t' {aka 'const short
 unsigned int'} pointer (alignment 2) may result in an unaligned pointer value [-Werror=address-of-packed-member]
|   178 |  const unaligned_uint16_t *ea_words = (const unaligned_uint16_t *)ea;
|       |  ^~~~~

Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>

3 files changed, 53 insertions, 0 deletions

diff --git a/recipes-extended/dpdk/dpdk/dpdk-17.11-mk-disable-warning-for-packed-member-pointer.patch b/recipes-extended/dpdk/dpdk/dpdk-17.11-mk-disable-warning-for-packed-member-pointer.patch
new file mode 100644
index 0000000..70a8dec
--- /dev/null
+++ b/recipes-extended/dpdk/dpdk/dpdk-17.11-mk-disable-warning-for-packed-member-pointer.patch
@@ -0,0 +1,48 @@
+From a385972c3675dd2b4792ab5b3cf7a536e6f9846c Mon Sep 17 00:00:00 2001
+From: Reshma Pattan <reshma.pattan@intel.com>
+Date: Thu, 2 May 2019 10:33:34 +0100
+Subject: [PATCH] mk: disable warning for packed member pointer
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+gcc 9 on Fedora 30 gives an error
+"taking address of packed member may result in an
+unaligned pointer value" warnings.
+
+For clang builds this warning is already disabled,
+so disable "-Waddress-of-packed-member" for gcc builds
+also.
+
+Snippet of build error:
+lib/librte_eal/linux/eal/eal_memalloc.c: In function ‘alloc_seg_walk’:
+lib/librte_eal/linux/eal/eal_memalloc.c:768:12: error:
+taking address of packed member of ‘struct rte_mem_config’ may result
+in an unaligned pointer value [-Werror=address-of-packed-member]
+  768 |  cur_msl = &mcfg->memsegs[msl_idx];
+      |            ^~~~~~~~~~~~~~~~~~~~~~~
+
+Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
+Tested-by: David Marchand <david.marchand@redhat.com>
+Upstream-Status: Backport
+Signed-off-by: He Zhe <zhe.he@windriver.com>
+---
+ mk/toolchain/gcc/rte.vars.mk | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.mk
+index d8b99fa..b852fcf 100644
+--- a/mk/toolchain/gcc/rte.vars.mk
++++ b/mk/toolchain/gcc/rte.vars.mk
+@@ -87,5 +87,8 @@ WERROR_FLAGS += -Wimplicit-fallthrough=2
+ WERROR_FLAGS += -Wno-format-truncation
+ endif
+ 
++# disable packed member unalign warnings
++WERROR_FLAGS += -Wno-address-of-packed-member
++
+ export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
+ export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS
+-- 
+2.7.4
+
diff --git a/recipes-extended/dpdk/dpdk_17.11.3.bb b/recipes-extended/dpdk/dpdk_17.11.3.bb
index 7fc89d2..af42ad8 100644
--- a/recipes-extended/dpdk/dpdk_17.11.3.bb
+++ b/recipes-extended/dpdk/dpdk_17.11.3.bb
@@ -12,4 +12,5 @@ SRC_URI += "\
         file://dpdk-16.07-dpdk-fix-for-parellel-make-issue.patch \
         file://dpdk-17.02-dpdk-fix-installation-warning-and-issue.patch \
         file://dpdk-17.11-Fix-strncpy-error-for-GCC8.patch \
+        file://dpdk-17.11-mk-disable-warning-for-packed-member-pointer.patch \
 "
diff --git a/recipes-extended/dpdk/dpdk_18.11.1.bb b/recipes-extended/dpdk/dpdk_18.11.1.bb
index 2d04346..39beb65 100644
--- a/recipes-extended/dpdk/dpdk_18.11.1.bb
+++ b/recipes-extended/dpdk/dpdk_18.11.1.bb
@@ -9,6 +9,10 @@ LIC_FILES_CHKSUM = "file://license/gpl-2.0.txt;md5=b234ee4d69f5fce4486a80fdaf4a4
                     file://license/lgpl-2.1.txt;md5=4b54a1fd55a448865a0b32d41598759d \
                     file://license/bsd-3-clause.txt;md5=0f00d99239d922ffd13cabef83b33444"
 
+SRC_URI += " \
+             file://dpdk-17.11-mk-disable-warning-for-packed-member-pointer.patch \
+             "
+
 do_install_append () {
     # Remove the unneeded dir
     rm -rf ${D}/${INSTALL_PATH}/${RTE_TARGET}/app