I think we went through this issue before. nvc is the 'c' compiler. And for some reason its giving 'cuda' warnings. I think you might have switched progenv last time [and avoided this compiler] You can try using this compiler manually - on simple code - and then seek help from the admins on how to avoid these warnings.. Satish - create test.c with: #include <stdlib.h> compile (or preporcess): cc -E test.c - You should get: stderr: nvc-Warning-The -gpu option has no effect unless a language-specific option to enable GPU code generation is used (e.g.: -acc, -mp=gpu, -stdpar, -cuda) Now provide this info to the machine admins [or nvidia folk] - and ask how to get rid of this message. Satish On Thu, 4 Nov 2021, Mark Adams wrote:

Correction it is nvc:

nvc-Warning-The -gpu option has no effect unless a language-specific option to enable GPU code generation is used (e.g.: -acc, -mp=gpu, -stdpar, -cuda)

And I add -mp=gpu to CUDAFLAGS

On Thu, Nov 4, 2021 at 1:09 PM Satish Balay <[email protected]> wrote:

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On Thu, 4 Nov 2021, Mark Adams wrote:

...

Does anyone know if PETSc calls nvcc and hence can add flags to the invocation? nvcc wants a flag like -mp=gpu but I don't know if we do that or a compiler wrapper in the environment.

$ ./configure --help |grep CUDA <snip> --CUDAC=<prog> Specify the CUDA compiler --CUDAFLAGS=<string> Specify the CUDA compiler options <snip>

Satish