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FindCUDA: nvcc configurable via CUDA_NVCC_EXECUTABLE envvar

Edward Z. Yang requested to merge ezyang/cmake:pr/cuda-nvcc-executable-env into master

This is useful if, for example, you want ccache to be used for nvcc. With the current behavior, cmake always picks up /usr/local/cuda/bin/nvcc, even if there is a ccache nvcc stub in the PATH. Allowing for CUDA_NVCC_EXECUTABLE lets us work around the problem.

Signed-off-by: Edward Z. Yang ezyang@fb.com
Topic-rename: FindCUDA-nvcc-executable-env

Edited by Brad King

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