[petsc-dev] invocation of nvcc

[Satish Balay]

Then you can try:

CPPFLAGS=-mp-gpu
CFLAGS=-mp-gpu

Satish

On Thu, 4 Nov 2021, Mark Adams wrote:

> But I can get rid of that with: cc -E -mp-gpu
> I expect that is what they will say.
> 
> On Thu, Nov 4, 2021 at 1:40 PM Satish Balay <balay at mcs.anl.gov> wrote:
> 
> > 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 <balay at mcs.anl.gov> wrote:
> > >
> > > >
> > > > 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
> > > >
> > >
> >
> >
>