$ source /opt/intel/inteloneapi/setvars.sh
$ dpcpp -fPIC -static -c vector-add.cpp -o vector-add.o
$ llvm-ar rcs lib_vector_add.a vector-add.o
$ g++ main.cpp lib_vector_add.a -o main -lsycl
$ ./main 
Device: Intel(R) Core(TM) i7-6950X CPU @ 3.00GHz
terminate called after throwing an instance of 'cl::sycl::runtime_error'
  what():  No kernel named _ZTS9VectorAdd was found -46 (CL_INVALID_KERNEL_NAME)
PLEASE submit a bug report to https://software.intel.com/en-us/support/priority-support and include the crash backtrace.
Aborted (core dumped)