Hmm, interesting, when I run python setup.py, this is how my output looks like:
[1/165] Building NVCC (Device) object src/ATen/CMakeFiles/ATen.dir/__/THCUNN/ATen_generated_IndexLinear.cu.o
[2/165] Building NVCC (Device) object src/ATen/CMakeFiles/ATen.dir/__/THCUNN/ATen_generated_SpatialConvolutionMM.cu.o
[3/165] Building NVCC (Device) object src/ATen/CMakeFiles/ATen.dir/__/THCUNN/ATen_generated_VolumetricUpSamplingNearest.cu.o
[4/165] Building NVCC (Device) object src/ATen/CMakeFiles/ATen.dir/__/THCUNN/ATen_generated_SpatialDilatedMaxPooling.cu.o
[5/165] Building NVCC (Device) object src/ATen/CMakeFiles/ATen.dir/__/THC/ATen_generated_THCTensorMathBlas.cu.o
......

Is there some command-line option that tells CMake to show the actual command?  (Sorry, this must be a very basic question, but I couldn’t find an answer anywhere.)
Not sure if it matters, but I have installed Ninja, following the recommendations from CONTRIBUTING.md 4.