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CMake build: Add -DLAPACK option, un-break CBLAS+BLAS build, do not require C++ if unnecessary #972

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CMake build: Add -DLAPACK option, un-break CBLAS+BLAS build, do not require C++ if unnecessary #972

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Commits on Jan 8, 2024

  1. cmake: Add option to (not) build LAPACK library. 

    All components are optional now, so that only BLAS can be built.
    @drhpc
    drhpc committed Jan 8, 2024
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  2. cmake: un-break build of blas+cblas 

    This enables

  cmake -DLAPACK=off -DLAPACKE=off -DCBLAS=ON -DUSE_OPTIMIZED_BLAS=OFF ..

to finish without complaining about cblas missing blas-targets. This installs
additional cmake machinery for libblas, which seems to be fair, like the other
libs.
    @drhpc
    drhpc committed Jan 8, 2024
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  3. cmake: do not require C++ unless BLAS++ or LAPACK++ are built 

    The current setup requires a C++ compiler when none is needed, tripping
up some build frameworks that are picky about that. And … there are situations
where you have a C compiler and no C++.
    @drhpc
    drhpc committed Jan 8, 2024
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