在调用main函数之前使用GPU常量内存

Question

我有init函数er_const.cu

__device__ __constant__ __extended_range_struct ER_ONE_CONST;
__device__ __constant__ __extended_range_struct ER_HALF_CONST;
__device__ __constant__ __extended_range_struct ER_SERIES_PREC_CONST;

namespace cuda {
    void er_const_init() {
        er_ptr one_host;
        one_host = new __extended_range_struct;
        *one_host = (__extended_range_struct) {1.0, 0};
        gpuErrchk(cudaMemcpyToSymbol(ER_ONE_CONST, one_host, sizeof(__extended_range_struct)));
        gpuErrchk(cudaDeviceSynchronize());

        er_ptr half_host;
        half_host = new __extended_range_struct;
        er_set_d(half_host, 0.5);
        gpuErrchk(cudaMemcpyToSymbol(ER_HALF_CONST, half_host, sizeof(__extended_range_struct)));
        gpuErrchk(cudaDeviceSynchronize());
        er_ptr series_prec_host;
        series_prec_host = new __extended_range_struct;
        er_set_d(series_prec_host, ER_SERIES_PREC);
        gpuErrchk(cudaMemcpyToSymbol(ER_SERIES_PREC_CONST, series_prec_host, sizeof(__extended_range_struct)));
        gpuErrchk(cudaDeviceSynchronize());
        delete one_host;
        delete half_host;
        delete series_prec_host;
    }
}

__attribute__ ((constructor)) void premain()
{
        //cuda::er_const_init();

}

和它的头文件er_const.cuh

extern __device__ __constant__ __extended_range_struct ER_ONE_CONST;
extern __device__ __constant__ __extended_range_struct ER_HALF_CONST;
extern __device__ __constant__ __extended_range_struct ER_SERIES_PREC_CONST;

namespace cuda {
    void er_const_init();
}

如果我在main（）中调用此函数它的工作，但如果我尝试在er_const.cu中创建函数wich在main（）之前调用我有错误： “无效的设备符号”