[PATCH v2 1/4] app: add LDFLAGS -latomic to link atomic lib

[Gavin Hu <gavin.hu@arm.com>]

For ARM64 platform, libdpdk.a includes the librte_pmd_octeontx_ssovf.a,
which requires the libatomic.a support.The atomic lib is built-in in the
gcc toolchain, but for clang it has to be explicitly linked.
For more details, please refer to https://clang.llvm.org/docs/Toolchain.html

~/dpdk/build/lib/librte_pmd_octeontx_ssovf.a(timvf_worker.o): In function
`timvf_timer_cancel_burst':
timvf_worker.c:(.text+0x80): undefined reference to `__atomic_fetch_add_8'
/home/gavin/arm_repo/dpdk/build/lib/librte_pmd_octeontx_ssovf.a(timvf_worker.o):
In function `timvf_timer_arm_burst_sp':
timvf_worker.c:(.text+0x200): undefined reference to `__atomic_fetch_add_8'
timvf_worker.c:(.text+0x244): undefined reference to `__atomic_store_2'
timvf_worker.c:(.text+0x278): undefined reference to `__atomic_fetch_add_4'
timvf_worker.c:(.text+0x30c): undefined reference to `__atomic_store_2'

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
---
 mk/rte.app.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 438f99d..bca8325 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -51,6 +51,7 @@ endif
 
 # Link only the libraries used in the application
 LDFLAGS += --as-needed
+LDFLAGS += -latomic
 
 # default path for libs
 _LDLIBS-y += -L$(RTE_SDK_BIN)/lib
-- 
2.1.4