It gets a lot further. On Thu, Nov 4, 2021 at 5:32 PM Mark Adams <[email protected]> wrote:

OK, sorry I missed the CPPFLAGS. It is running now. Thanks,

On Thu, Nov 4, 2021 at 4:43 PM Satish Balay <[email protected]> wrote:

...

Multiple e-mail threads on the same issue (:

As suggested in my earlier thread - add -mp=gpu to both CPPFLAGS and CFLAGS [or LDFLAGS]

Satish

------- Executing: cc -o /tmp/petsc-Vvs8_T/config.setCompilers/conftest -g -DLANDAU_DIM=2 -DLANDAU_MAX_SPECIES=10 -DLANDAU_MAX_Q=4 /tmp/petsc-Vvs8_T/config.setCompilers/conftest.o Possible ERROR while running linker: 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)

On Thu, 4 Nov 2021, Mark Adams wrote:

...

It is CPPFLAGS. I seem to get the same behavior.

FWIW, I did get this response from NERSc but I don't know how to interpret it.

He seems to be saying that I don't need -mp=gpu for the device compiler (nvcc). He seems to think that I am adding -gpu.

nvcc -- The device compiler does not need any of those flags because it already knows that it's being fed cuda code. The warning you're seeing is coming from nvc (which is the host / CPU side compiler) if you're in the PrgEnv-nvidia environment. You should not need to add -mp=gpu and -cuda, please just add the -cuda flag (to your host code) not to the device code.

I will try to talk with this guy again.

Thanks,

On Thu, Nov 4, 2021 at 4:11 PM Barry Smith <[email protected]> wrote:

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Yes, you need to use the CPPFLAGS which maybe called CPPCFLAGS I am

not

...

sure

On Nov 4, 2021, at 3:23 PM, Mark Adams <[email protected]> wrote:

Ah, CCFLAGS does not seem to work.

On Thu, Nov 4, 2021 at 3:07 PM Barry Smith <[email protected]> wrote:

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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 <[email protected]> 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>