Anyone else come across this weirdness in the FD.io VPP Clang Debug Build : && ccache /usr/lib64/ccache/clang --target=x86_64-linux-gnu -Wno-address-of-packed-member -march=corei7 -mtune=corei7-avx -g -O0 -DCLIB_DEBUG -DFORTIFY_SOURCE=2 -fstack-protector-all -fPIC -Werror -flax-vector-conversions -Wno-sometimes-uninitialized vcl/CMakeFiles/sock_test_server.dir/sock_test_server.c.o -o bin/sock_test_server -Wl,-rpath,/root/src/vpp/build-root/build-vpp_debug-native/vpp/lib lib/libvppcom.so.19.04.3 -lpthread lib/libvlibmemoryclient.so.19.04.3 lib/libsvm.so.19.04.3 lib/libvppinfra.so.19.04.3 -lm -lrt -lpthread && : /usr/bin/ld: lib/libvppcom.so.19.04.3: undefined reference to `vnet_incremental_checksum_fp' clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
Basically what happens is that for anything that includes ip_packet.h but is not linked to vnet, CLang tries unsuccessfully to resolve symbol vnet_incremental_checksum_fp. It doesn't happen with the release build, I am assuming (always dangerous) because some optimization figures out that vnet_incremental_checksum_fp is never called and removes the dependency. Ray K
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