Add blas-devel to the packages required to build against blas

[traversaro]

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If you install just libblas on Windows (that installs the mkl variant), then for example in CMake find_package(BLAS REQUIRED) fails, so it is also necessary to add blas-devel. On the other hand, it is required to build against libblas as libblas has the correct run_exports, while blas-devel does not have them.

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[traversaro]

Just to explain why this PR is useful, we were hit again by the missing blas-devel in conda-forge/suitesparse-feedstock#92 .

[xhochy]

This sounds a bit like blas-devel also should have some run_exports. I'm not sure which ones though.

[isuruf]

This is unnecessary. We've had this design working for years now. Please revert and open an issue in `blas-feedstock.

[traversaro]

This is unnecessary. We've had this design working for years now.

Sorry, it is not clear to me why this is unnecessary, can you elaborate more? Thanks!

Please revert and open an issue in `blas-feedstock.

An issue about what? That find_package(BLAS) fails on Windows if you just install libblas ?

[isuruf]

Sorry, it is not clear to me why this is unnecessary, can you elaborate more? Thanks!

blas-devel is a meta-package for the 4 packages libblas, libcblas, liblapack, liblapacke. It's better to use the 4 as needed in recipes.

An issue about what? That find_package(BLAS) fails on Windows if you just install libblas ?

Yes

[traversaro]

Sorry, it is not clear to me why this is unnecessary, can you elaborate more? Thanks!

blas-devel is a meta-package for the 4 packages libblas, libcblas, liblapack, liblapacke. It's better to use the 4 as needed in recipes.

God point, from the name I thought it only dependended on libblas plus the required devel packages (similar to other *-devel packages), but this is not the case indeed (I just checked with https://conda-metadata-app.streamlit.app/?q=conda-forge%2Flinux-64%2Fblas-devel-3.9.0-21_linux64_mkl.conda).

Yes

Done: conda-forge/blas-feedstock#120 .

[isuruf]

Could you send a PR reverting this?

[traversaro]

Could you send a PR reverting this?

Done: #2179 .