[lapack-reference] fix cblas feature

[Neumann-A]

closes #12911

depends #12895 for CI success

[LilyWangL]

@Neumann-A Thanks for your PR. I installed lapack-reference[cblas] and got the following error:

Building package lapack-reference[blas-select,cblas,core,noblas]:x64-windows... done
Installing package lapack-reference[blas-select,cblas,core,noblas]:x64-windows...
The following files are already installed in E:/Lily/pr/vcpkg/installed/x64-windows and are in conflict with lapack-reference:x64-windows

Installed by openblas:x64-windows
    include/cblas.h

[Neumann-A]

@LilyWangL: noblas and cblas are by design incompatible. Still if openblas is installed there will be a file conflict between those two ports if lapack-reference is built with feature cblas.

[LilyWangL]

Yes, if noblas and cblas are by design incompatible, blas-select should not be default feature. If blas-select is default feature, when I install lapack-reference[cblas], it will install lapack-reference[blas-select,cblas,core,noblas]. lapack-reference[cblas] will build failed on Windows.

[Neumann-A]

blas-select needs to be the default feature otherwise ci and users don't get what they expect. People who explicitly want cblas must deactivate the defaults by explicitly declaring [core,cblas]. Feature cblas only exists for corner cases and should be treated as such.

[Neumann-A]

The feature is also up for removal as soon as a native windows fortran compiler is available

[LilyWangL]

Could add message for feature cblas to declare that this feature does not support windows temporarily?

[Neumann-A]

Could add message for feature cblas to declare that this feature does not support windows temporarily?

It should support windows if you install it without the feature noblas

[LilyWangL]

I test lapack-reference[cblas]:x64-windows-static and it can install successfully.

Building package lapack-reference[blas-select,cblas,core]:x64-windows-static... done
Installing package lapack-reference[blas-select,cblas,core]:x64-windows-static...
Installing package lapack-reference[blas-select,cblas,core]:x64-windows-static... done
Elapsed time for package lapack-reference:x64-windows-static: 6.92 min

Total elapsed time: 10.11 min

[BillyONeal]

Thanks for your contribution!