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Add nvhpc FFT option #12

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@@ -64,7 +64,10 @@ else ifeq ($(FFT),fftw3_f03)
LIBFFT=-L$(FFTW3_PATH)/lib -lfftw3 -lfftw3f
else ifeq ($(FFT),generic)
INC=
LIBFFT=#-lnvhpcwrapnvtx
LIBFFT=
else ifeq ($(FFT),nvhpc)
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This is probably broken when FFT=nvhpc because there is no file "fft_nvhpc.f90" in decomp2d ?

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good point - totally untested code, but in principle this is how it should work, generic should be portable and not link NVIDIA libraries

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