Now Makefile autodetects cuda arch and nvcc version if possible

src/Makefile

@@ -1,12 +1,46 @@
+#Uncomment if you have boost, it will greatly improve performance
+#USE_BOOST=-DUSE_BOOST
+
+#The target CUDA compute capability(s), if not set it will be autodetected
+#ARCH ?= 30 35 50 52 60 61
+ARCH=
+
+#Uncomment to compile in double precision mode, single by default
+#DOUBLE_PRECISION=-DDOUBLE_PRECISION
+
+#C++ compiler, I tested up to clang++-5.0
+#CXX=clang++-5.0
+CXX=g++
+
+#Cuda version (assumed to be in /usr/local/cuda*) You can change this in CUDA_ROOT
+#If not set it will be autodetected
+CUDA_VER=
+
+ifeq ($(CUDA_VER),)
+CUDA_VER:=$(shell ls -d /usr/local/cuda*/ | grep -Eo '\-[0-9]\.[0-9]' | cut -d- -f2 | sort -grk1 | head -1)
+endif
+CUDA_ROOT=/usr/local/cuda-$(CUDA_VER)
+
+#Flags to $(CXX)
+CPU= -O3 -funroll-loops  -fno-math-errno -fno-signed-zeros  -march=native -fPIC -Wall -Wextra -Wno-unused-parameter -Wno-unused-function -Wno-sign-compare
+
+
+#If arch was not set, autodetect all GPUs in the system
+ifeq ($(ARCH),)
+GENCODE_FLAGS:=$(shell printf '\#include<cstdio>\n int main(){int nD;cudaGetDeviceCount(&nD);for(int i=0;i<nD;i++){cudaDeviceProp dp;cudaGetDeviceProperties(&dp, i);std::printf("%%d\\n", dp.major*10+dp.minor);} return 0;}' | $(CUDA_ROOT)/bin/nvcc -Wno-deprecated-gpu-targets -x cu - -o /tmp/listarch --run | sort -g -k1 | uniq | awk 'END{system("rm -f /tmp/listarch")}{print "-gencode arch=compute_"$$1",code=sm_"$$1}')
+else
+$(foreach sm,$(ARCH),$(eval GENCODE_FLAGS += -gencode arch=compute_$(sm),code=sm_$(sm)))
+endif
+
+
+INCLUDEFLAGS= -I$(CUDA_ROOT)/include
+BASIC_LINE= $(CUDA_ROOT)/bin/nvcc   -O3 -std=c++11 -x cu    $(INCLUDEFLAGS) $(OPTIONS)  -ccbin="$(CXX)" -Xcompiler="$(CPU)" $(GENCODE_FLAGS) -L$(CUDA_ROOT)/lib64
 
 
-ARCH=35
 
-#Uncomment if you have boost, it will greatly improve performance
-#USE_BOOST=-DUSE_BOOST
 all: gitversion.h #main.o
 	mkdir -p ../bin
-	nvcc -g -I . -arch=sm_$(ARCH) -std=c++11 -O3 main.cu -o ../bin/rdf $(USE_BOOST)
+	$(BASIC_LINE) -I . main.cu -o ../bin/rdf $(USE_BOOST)
 
 gitversion.h: ../.git/HEAD ../.git/index
 	echo "#ifndef GITVERSION" > $@
@@ -15,6 +49,7 @@ gitversion.h: ../.git/HEAD ../.git/index
 
 clean:
 	rm -f gitversion.h
+
 # %.o:%.cu
 # 	nvcc -g  -I . -arch=sm_$(ARCH) -std=c++11 -O3 $(USE_BOOST) $< -c -o $@