Add `clblast` recipe for OpenCL BLAS support

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We'd like to add CLBlast to the recipes system. CLBlast is a tuned OpenCL BLAS library that provides GPU-accelerated linear algebra routines. This is a compiled static library (not headers), which should meet the recipes requirements.

Background

CLBlast is needed to enable the OpenCL backend for RcppBandicoot, which provides R bindings for the Bandicoot GPU-accelerated linear algebra library. Bandicoot uses CLBlast for optimized BLAS operations when running on OpenCL devices.

CLBlast Library Details

• Repository: https://github.com/CNugteren/CLBlast
• Latest Release: v1.6.3 (June 13, 2024)
• License: Apache-2.0
• Build System: CMake

Dependencies

CLBlast requires OpenCL headers and runtime. On macOS, it links against the system OpenCL 1.3 framework (-framework OpenCL), which is available on all supported macOS versions.

Static Library Support

CLBlast explicitly supports static library builds via the BUILD_SHARED_LIBS CMake option:

cmake .. -DBUILD_SHARED_LIBS=OFF

This produces libclblast.a suitable for static linking. For details, please see CLBlast: Building and installing.

Requested Recipe

Given the above discussion, we can create a recipe that should work with:

Package: clblast
Version: 1.6.3
Source-URL: https://github.com/CNugteren/CLBlast/archive/refs/tags/${ver}.tar.gz
Build-System: cmake
Configure: -DBUILD_SHARED_LIBS=OFF -DSAMPLES=OFF -DTUNERS=OFF -DTESTS=OFF -DCLIENTS=OFF

The configure flags disable optional components (samples, tuners, tests, benchmark clients) that aren't needed for the library itself. Let me know if you would like me to send a PR.

References

• Prior discussion on OpenCL headers: Add opencl-headers recipe to enable OpenCL backend #83
• CLBlast GitHub: https://github.com/CNugteren/CLBlast
• Bandicoot documentation: https://coot.sourceforge.io/docs.html