[CMake] problem with FindBLAS.cmake looking for cblas_dgemm

[Crni Gorac]

On Wed, Jun 2, 2010 at 2:08 PM, Michael Wild <themiwi at gmail.com> wrote:
>
> Just to correct a thing: cblas_dgemm is NOT an implementation detail, it is part of CBLAS which is the official C-interface to BLAS.

I think "implementation detail" mentioned in the OP message was not
about CBLAS per se, but about linking C code from the Fortran compiler
instead, which is indeed an implementation detail, and which is
surfacing because of FindBLAS.cmake is currently working exactly by
asking Fortran compiler to find a CBLAS function - so much more
meaningful test would be to ask the compiler to find BLAS function,
again exactly as suggested in the OP message.

As far as your idea on splitting FindBLAS into multiple modules: this
kind of arrangement makes sense too, but basically all the provisions
for this type of modularization, as well as for selecting particular
BLAS implementation, are already there in existing FindBLAS module -
so it's only a question of one or another type of module organization.

This module is indeed very complex, but so are number of other CMake
modules.  Obviously, no maintainer of these modules could afford to
track all of the possible implementation, but basically users of
particular implementation are usually reporting errors and suggesting
improvements, and this worked very well so far.  It seems only in this
particular case that the issue somehow got below of the radar of
Kitware people, hope they would fix it now...

Regards.