[petsc-users] Ignoring PETSC_ARCH for make check?

[san.temporal at gmail.com]

 Ok, the, the second option applies... I had forgotten about this
observation from the multiple times I installed PETSc in the past.

Then, two questions come to mind:

1. Why is it set up like that?
2. What is the difference in behaviour? I see the same output from both
options.

Thanks again!

On Sat, Apr 18, 2020 at 5:43 PM Jed Brown <jed at jedbrown.org> wrote:

> It's intentional and been like this for ages.  Prefix installs have only
> PETSC_DIR (just a path, like other packages), and *must not* set
> PETSC_ARCH.
>
> san.temporal at gmail.com writes:
>
> > Hi all,
> >
> > I have just successfully compiled 3.13.0. But with install this is what I
> > get
> >
> >     $ make
> PETSC_DIR=/home/santiago/Documents/installers/petsc/petsc-3.13.0
> > PETSC_ARCH=arch-linux2-c-opt install
> >     *** Using
> > PETSC_DIR=/home/santiago/Documents/installers/petsc/petsc-3.13.0
> > PETSC_ARCH=arch-linux2-c-opt ***
> >     *** Installing PETSc at prefix location: /home/santiago/usr/local
> ***
> >     ====================================
> >     Install complete.
> >     Now to check if the libraries are working do (in current directory):
> >     make PETSC_DIR=/home/santiago/usr/local PETSC_ARCH="" check
> >     ====================================
> >     /usr/bin/make  --no-print-directory -f makefile
> > PETSC_ARCH=arch-linux2-c-opt
> > PETSC_DIR=/home/santiago/Documents/installers/petsc/petsc-3.13.0
> > mpi4py-install petsc4py-install libmesh-install mfem-install
> slepc-install
> > hpddm-install amrex-install
> >     make[2]: Nothing to be done for 'mpi4py-install'.
> >     make[2]: Nothing to be done for 'petsc4py-install'.
> >     make[2]: Nothing to be done for 'libmesh-install'.
> >     make[2]: Nothing to be done for 'mfem-install'.
> >     make[2]: Nothing to be done for 'slepc-install'.
> >     make[2]: Nothing to be done for 'hpddm-install'.
> >     make[2]: Nothing to be done for 'amrex-install'.
> >
> > What is strange to me is that I am instructed to execute a line with
> > PETSC_ARCH=", while my environment has PETSC_ARCH=arch-linux2-c-opt
> > Why is that?
> >
> > PS: The same happened to me with various other compilations I have just
> > tested, with 3.9, 3.10, 3.11, 3.12
> >
> > PS2: I do not recall seeing this ever before, although I may have missed
> > it/forgotten.
> >
> > Thanks in advance,
> > Santiago
>
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