Build broken with non-MKL/OpenBLAS BLAS and COSMA_BLAS_VENDOR "auto"

[mcarmesin]

I'm trying to build COSMA with Spack and the AMD BLAS/LAPACK/SCALAPACK libraries. In this case, Spack sets the ScaLAPACK vendor to custom, so that cmake tries the auto mode to detect the BLAS libraries. Unfortunately it stops the search after looking for OpenBLAS even though the corresponding libs are not found.

In cmake/FindBlas.cmake there is a check (line 93)
if(TARGET cosma::BLAS::${_libs}::blas)
but unfortunately the FindXXX.cmake set the target even when the libs are not found.

[simonpintarelli]

Thanks for the report. Indeed, I've removed statement setting COSMA_BLAS_VENDOR to auto when the scalapack provider isn't mkl, nvpl, or libsci: #172

[simonpintarelli]

What is the spec you've tried to build?

I've tested it with amdscalapack and openblas.

[mcarmesin]

This is my stripped down spack environment that fails to build

# This is a Spack Environment file.
#
# It describes a set of packages to be installed, along with
# configuration settings.
spack:
  # add package specs to the `specs` list
  definitions:
  - chem_soft:
    - cosma+scalapack
  specs:
  - group: amd
    specs:
    - matrix:
      - [$chem_soft]
      - ['%mpi=openmpi@5.0']
      - ['%blas=amdblis@5.3 %scalapack=amdscalapack@5.3']
      - ['%gcc@16']
    override:
        all:
          prefer:
          - target=zen5
  view: false
  concretizer:
    unify: when_possible

[simonpintarelli]

Thanks, I couldn't check with amdblis, armpl-gcc fails to compile for me. Would you like to retry with the current master branch?

[mcarmesin]

Now CMake finds the BLAS library, but now the compilations fails:

AMDBLIS also needs
typedef CBLAS_ORDER CBLAS_LAYOUT;
in src/cosma/blas.cpp

Further we need

#if defined(COSMA_WITH_BLAS) || defined(COSMA_WITH_MKL_BLAS) || defined(COSMA_WITH_BLIS_BLAS)
#include <cosma/blas.hpp>
#endif

in src/cosma/local_multiply.cpp

[simonpintarelli]

thanks! It's merged in master branch. I'll create a new release too.