On Nov 4, 2021, at 3:23 PM, Mark Adams <mfadams@lbl.gov> wrote:

Ah, CCFLAGS does not seem to work. 

On Thu, Nov 4, 2021 at 3:07 PM Barry Smith <bsmith@petsc.dev> wrote:

  You have to pass in the flag to turn off the bitching about -gpu to the C preprocessor, not the C compiler.


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)
Source:
#include "confdefs.h"
#include "conffix.h"
#include <stdlib.h>



> On Nov 4, 2021, at 2:49 PM, Mark Adams <mfadams@lbl.gov> wrote:
>
> on Perlmutter with nvhpc:
>
>               Defined make macro "CPP" to "cc --use cpp32"
> Preprocessing source:
> #include "confdefs.h"
> #include "conffix.h"
> #include <stdlib.h>
>
> Executing: cc --use cpp32  -I/tmp/petsc-jV9U1b/config.setCompilers  /tmp/petsc-jV9U1b/config.setCompilers/conftest.c
> Possible ERROR while running preprocessor: exit code 1
> stderr:
> nvc-Error-Unknown switch: --use
> Source:
> <configure.log>

<configure.log>