I am a complete beginner to using spack.

Both flang and gcc support OpenMP offloading - this is the future of supercomputing - just one version of your code with OpenMP offloading to support any accelerator device, GPU, Vector Engine, etc.

I have not had any problems installing gcc or flang, with CUDA support, using install scripts dowloaded from the web.

However, with spack, I have had problems in both cases:
pgmath.txt
gcc_cuda.txt
flang_cuda.txt

When I try to install flang, the installation errors out with pgmath install.

When I try to install flang +cuda, the installation does not even begin due to 'conflict' diagnostics.

I can install gcc, but gcc +nvptx errors out.

• Spack: 0.15.4-1058-84dbf69
• Python: 3.6.8
• Platform: linux-centos7-skylake_avx512