dpdk: Make sure -march exist

Fixes:
   ERROR: ExpansionError during parsing /build/layers/meta-dpdk/recipes-extended/dpdk/dpdk_23.11.bb
   Traceback (most recent call last):
     File "Var <EXTRA_OEMESON>", line 1, in <module>
     File "/build/layers/meta-dpdk/recipes-extended/dpdk/dpdk_23.11.bb", line 12, in get_cpu_instruction_set(bb=<module 'bb' from '/build/layers/oe-core/bitbake/lib/bb/__init__.py'>, d=<bb.data_smart.DataSmart object at 0x7f63569bb070>):
         import re
     >    march = re.search(r'-march=([^\s]*)', d.getVar('CC')).group(1)
         return march
   bb.data_smart.ExpansionError: Failure expanding variable EXTRA_OEMESON, expression was  -Dexamples=all -Dcpu_instruction_set=${@get_cpu_instruction_set(bb, d)}   which triggered exception AttributeError: 'NoneType' object has no attribute 'group'
   The variable dependency chain for the failure is: EXTRA_OEMESON -> meson_do_configure

   ERROR: Parsing halted due to errors, see error messages above

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/recipes-extended/dpdk/dpdk_23.11.bb b/recipes-extended/dpdk/dpdk_23.11.bb
index 5f0f9ec..fc2796a 100644
--- a/recipes-extended/dpdk/dpdk_23.11.bb
+++ b/recipes-extended/dpdk/dpdk_23.11.bb
@@ -9,8 +9,11 @@ S = "${WORKDIR}/git"
 
 def get_cpu_instruction_set(bb, d):
     import re
-    march = re.search(r'-march=([^\s]*)', d.getVar('CC')).group(1)
-    return march
+    march = re.search(r'-march=([^\s]*)', d.getVar('CC'))
+    if march:
+        return march.group(1)
+    else:
+        return "core2"
 
 EXTRA_OEMESON = " -Dexamples=all -Dcpu_instruction_set=${@get_cpu_instruction_set(bb, d)} "