GCC fails to compile OpenMP offloading to GPU - c++

Question

I'm using GCC 9.3 on Ubuntu 20.04. I want to offload the famous SAXPY example to GPU using OpenMP. I installed GCC's offloading capabilities by sudo apt install gcc-9-offload-nvptx . Then compiled the following code by g++ -fopenmp main.cpp:
int main()
{
const size_t kNumel = 999999;
float x[kNumel];
float y[kNumel];
for (size_t i=0 ;i <kNumel; i++)
{
x[i] = i;
y[i] = i;
}
const float kCoef = 1.23f;
#pragma omp target teams distribute parallel for
for (size_t i=0; i < kNumel; i++)
{
y[i] = kCoef*x[i] + y[i];
}
return 0;
}
BUT it doesn't compile and shows this error:
to1: error: ‘-fcf-protection=full’ is not supported for this target
mkoffload: fatal error: x86_64-linux-gnu-accel-nvptx-none-gcc-9 returned 1 exit status
compilation terminated.
lto-wrapper: fatal error: /usr/lib/gcc/x86_64-linux-gnu/9//accel/nvptx-none/mkoffload
returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
I added -fno-stack-protector but the same error is reproduced.