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Task #2500

Updated by Aleksei Iupinov over 2 years ago

When https://gerrit.gromacs.org/7837 is getting merged, Gromacs OpenCL builds start always linking to the bundled clFFT.
We should be able and prefer to link to the system clFFT by default though.
That might also later raise questions like what is the minimum version of clFFT required.

Tasks:
* detect external clFFT (CMake script available here: https://github.com/clMathLibraries/clFFT/blob/master/src/FindclFFT.cmake, as well as in Gromacs master: src/external/clFFT/src/FindclFFT.cmake) https://github.com/clMathLibraries/clFFT/blob/master/src/FindclFFT.cmake)
* implement minimum version req'd
* implement clFFT version reporting in the @-version@ header

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