compile error

[SJS-dev]

/usr/src/xmrig-cuda-6.15.1/src/cuda_extra.cu: In function ‘void cryptonight_extra_cpu_prepare(nvid_ctx*, uint32_t, const xmrig_cuda::Algorithm&)’:
/usr/src/xmrig-cuda-6.15.1/src/cuda_extra.cu:415:170: warning: passing argument 5 to restrict-qualified parameter aliases with argument 6 [-Wrestrict]
CUDA_CHECK_KERNEL(ctx->device_id, cryptonight_extra_gpu_prepareAlgorithm::CN_0<<<grid, block >>>(wsize, ctx->d_input, ctx->inputlen, startNonce,
^
/usr/src/xmrig-cuda-6.15.1/src/cuda_extra.cu: In function ‘int cuda_get_deviceinfo(nvid_ctx*)’:
/usr/src/xmrig-cuda-6.15.1/src/cuda_extra.cu:571:26: warning: comparison of integer expressions of different signedness: ‘int’ and ‘const size_t’ {aka ‘const long unsigned int’} [-Wsign-compare]
if (ctx->device_blocks > max_blocks) {
~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

/usr/src/xmrig-cuda-6.15.1/src/RandomX/randomx_cuda.hpp(319): warning: pointless comparison of unsigned integer with zero

using:
cmake .. -DCMAKE_C_COMPILER=$(which gcc-8) -DCMAKE_CXX_COMPILER=$(which g++-8)