nvcc fatal : Unsupported gpu architecture 'compute_20'

[IsmailM]

See heathsc/gemBS-rs#1

I see the following error when building gem-cutter:

$ make install
make -f Makefile.gemBS install
make[1]: Entering directory '/home/ucbtmog/progz/gemBS-rs'
make -C c_tools
make[2]: Entering directory '/home/ucbtmog/progz/gemBS-rs/c_tools'
make --directory=gem3-mapper
make[3]: Entering directory '/home/ucbtmog/progz/gemBS-rs/c_tools/gem3-mapper'
make --directory=resources release
make[4]: Entering directory '/home/ucbtmog/progz/gemBS-rs/c_tools/gem3-mapper/resources'
make --directory=gem-cutter release
make[5]: Entering directory '/home/ucbtmog/progz/gemBS-rs/c_tools/gem3-mapper/resources/gem-cutter'
/usr/local/cuda/bin/nvcc -O3 -m64 -Xptxas="-dlcm=ca" -gencode arch=compute_20,code=\"sm_20,compute_20\" -gencode arch=compute_20,code=sm_21 -gencode arch=compute_30,code=sm_30 -gencode arch=compute_35,code=\"sm_35,compute_35\" -gencode arch=compute_37,code=sm_37 -gencode arch=compute_50,code=\"sm_50,compute_50\" -gencode arch=compute_52,code=\"sm_52,compute_52\" -gencode arch=compute_60,code=\"sm_60,compute_60\" -gencode arch=compute_61,code=\"sm_61,compute_61\" -gencode arch=compute_62,code=\"sm_62,compute_62\" -c src/gpu_fmi_decode.cu -o build/gpu_fmi_decode.o
nvcc fatal   : Unsupported gpu architecture 'compute_20'
Makefile:90: recipe for target 'build/gpu_fmi_decode.o' failed
make[5]: *** [build/gpu_fmi_decode.o] Error 1
make[5]: Leaving directory '/home/ucbtmog/progz/gemBS-rs/c_tools/gem3-mapper/resources/gem-cutter'
Makefile:16: recipe for target 'release' failed
make[4]: *** [release] Error 2
make[4]: Leaving directory '/home/ucbtmog/progz/gemBS-rs/c_tools/gem3-mapper/resources'
Makefile:32: recipe for target 'release' failed
make[3]: *** [release] Error 2
make[3]: Leaving directory '/home/ucbtmog/progz/gemBS-rs/c_tools/gem3-mapper'
Makefile:56: recipe for target 'gem3' failed
make[2]: *** [gem3] Error 2
make[2]: Leaving directory '/home/ucbtmog/progz/gemBS-rs/c_tools'
Makefile.gemBS:60: recipe for target 'c_tools' failed
make[1]: *** [c_tools] Error 2
make[1]: Leaving directory '/home/ucbtmog/progz/gemBS-rs'
Makefile:7: recipe for target 'install' failed
make: *** [install] Error 2

My NVCC version is:

nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2021 NVIDIA Corporation
Built on Thu_Jan_28_19:32:09_PST_2021
Cuda compilation tools, release 11.2, V11.2.142
Build cuda_11.2.r11.2/compiler.29558016_0

The server has two GPU GeForce RTX 3090...

I managed to get around the issue by updating Makefile, specifically setting the two following variables to empty:

From

CUDA_SASS_FLAG_20=-gencode arch=compute_20,code=\"sm_20,compute_20\" -gencode arch=compute_20,code=sm_21
CUDA_SASS_FLAG_30=$(CUDA_SASS_FLAG_20) -gencode arch=compute_30,code=sm_30 -gencode arch=compute_35,code=\"sm_35,compute_35\"

To:

CUDA_SASS_FLAG_20=
#-gencode arch=compute_20,code=\"sm_20,compute_20\" -gencode arch=compute_20,code=sm_21
CUDA_SASS_FLAG_30=
#$(CUDA_SASS_FLAG_20) -gencode arch=compute_30,code=sm_30 -gencode arch=compute_35,code=\"sm_35,compute_35\"

It would be great if the Makefile could automatically set the correct $CUDA_SASS_FLAGS based on the NVCC version...