Compile failure with conda compiler on macos about galsim HOT 5 CLOSED

Yep. That looks like it works.

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If I comment out this bit: https://github.com/GalSim-developers/GalSim/blob/main/setup.py#L151-L154. Then I'm back in business.

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@jamesp-epcc

Looks like we need a different way to identify a GPU-compatible compiler, which doesn't falsely trigger on the Apple clang variant.

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OK, it looks as if it's not safe to assume that a compiler that reports nvptx support can actually perform a successful GPU build. Maybe Apple supplies their core compiler with nvptx enabled but it requires other software to function properly. I'll replace this with a check that actually builds a small GPU program and ensures there are no errors.

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@jmeyers314 would you be able to check if this version of setup.py fixes the problem for you? https://raw.githubusercontent.com/jamesp-epcc/GalSim/gpu_compiler_detection/setup.py

It works for me on Perlmutter but I don't have a Mac OS machine to hand for testing.

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