~/dpdk/examples/bpf$ clang -O2 -target bpf -Wno-int-to-void-pointer-cast -c t2.c
In file included from t2.c:21:
In file included from /usr/local/include/rte_mbuf_core.h:21:
/usr/local/include/rte_byteorder.h:31:16: error: invalid output constraint '=Q' in asm
                      : [x1] "=Q" (x)
                             ^
1 error generated.


~/dpdk/examples/bpf$ clang -O2 -U __GNUC__ -target bpf -Wno-int-to-void-pointer-cast -c t3.c
In file included from t3.c:27:
In file included from /usr/local/include/rte_mbuf_core.h:21:
/usr/local/include/rte_byteorder.h:31:16: error: invalid output constraint '=Q' in asm
                      : [x1] "=Q" (x)
                             ^
1 error generated.