CUDA Dynamic Parallelism MakeFile - c

Question

This is my first program using Dynamic Parallelism and I am unable to compile the code. I need to be able to run this for my research project at college and any help will be most appreciated:
I get the following error:
/cm/shared/apps/cuda50/toolkit/5.0.35/bin/nvcc -m64 -dc -gencode arch=compute_35,code=sm_35 -rdc=true -dlink -po maxrregcount=16 -I/cm/shared/apps/cuda50/toolkit/5.0.35 -I. -I.. -I../../common/inc -o BlackScholes.o -c BlackScholes.cu
g++ -m64 -I/cm/shared/apps/cuda50/toolkit/5.0.35 -I. -I.. -I../../common/inc -o BlackScholes_gold.o -c BlackScholes_gold.cpp
g++ -m64 -o BlackScholes BlackScholes.o BlackScholes_gold.o -L/cm/shared/apps/cuda50/toolkit/5.0.35/lib64 -lcudart -lcudadevrt
BlackScholes.o: In function `__sti____cudaRegisterAll_47_tmpxft_000059cb_00000000_6_BlackScholes_cpp1_ii_c58990ec()':
tmpxft_000059cb_00000000-3_BlackScholes.cudafe1.cpp:(.text+0x1354): undefined reference to `__cudaRegisterLinkedBinary_47_tmpxft_000059cb_00000000_6_BlackScholes_cpp1_ii_c58990ec'
collect2: ld returned 1 exit status
make: *** [BlackScholes] Error 1
I have one cpp file, one cu file and one cuh file. Important portions of my makefile are below:
# CUDA code generation flags
#GENCODE_SM10 := -gencode arch=compute_10,code=sm_10
GENCODE_SM20 := -gencode arch=compute_20,code=sm_20
GENCODE_SM30 := -gencode arch=compute_30,code=sm_30 -gencode arch=compute_35,code=sm_35
GENCODE_SM35 := -gencode arch=compute_35,code=sm_35
#GENCODE_FLAGS := $(GENCODE_SM10) $(GENCODE_SM20) $(GENCODE_SM30)
GENCODE_FLAGS := $(GENCODE_SM35)
# OS-specific build flags
ifneq ($(DARWIN),)
LDFLAGS := -Xlinker -rpath $(CUDA_LIB_PATH) -L$(CUDA_LIB_PATH) -lcudart -lcudadevrt
CCFLAGS := -arch $(OS_ARCH)
else
ifeq ($(OS_SIZE),32)
LDFLAGS := -L$(CUDA_LIB_PATH) -lcudart -lcudadevrt
CCFLAGS := -m32
else
LDFLAGS := -L$(CUDA_LIB_PATH) -lcudart -lcudadevrt
CCFLAGS := -m64
endif
endif
# OS-architecture specific flags
ifeq ($(OS_SIZE),32)
NVCCFLAGS := -m32 -dc
else
NVCCFLAGS := -m64 -dc
endif
# Debug build flags
ifeq ($(dbg),1)
CCFLAGS += -g
NVCCFLAGS += -g -G
TARGET := debug
else
TARGET := release
endif
# Common includes and paths for CUDA
INCLUDES := -I$(CUDA_INC_PATH) -I. -I.. -I../../common/inc
# Additional parameters
MAXRREGCOUNT := -po maxrregcount=16
# Target rules
all: build
build: BlackScholes
BlackScholes.o: BlackScholes.cu
$(NVCC) $(NVCCFLAGS) $(EXTRA_NVCCFLAGS) $(GENCODE_FLAGS) -rdc=true -dlink $(MAXRREGCOUNT) $(INCLUDES) -o $# -c $<
BlackScholes_gold.o: BlackScholes_gold.cpp
$(GCC) $(CCFLAGS) $(INCLUDES) -o $# -c $<
BlackScholes: BlackScholes.o BlackScholes_gold.o
$(GCC) $(CCFLAGS) -o $# $+ $(LDFLAGS) $(EXTRA_LDFLAGS)
mkdir -p ../../bin/$(OSLOWER)/$(TARGET)
cp $# ../../bin/$(OSLOWER)/$(TARGET)
enter code here
run: build
./BlackScholes

Answer 1

When using the host linker (g++) for final linking of your executable, and when using relocatable device code (nvcc -dc), it's necessary to do an intermediate device code link step.
From the documentation:
If you want to invoke the device and host linker separately, you can do:
nvcc –arch=sm_20 –dc a.cu b.cu
nvcc –arch=sm_20 –dlink a.o b.o –o link.o
g++ a.o b.o link.o –L<path> -lcudart
Since you are specifying -dc on the compile line, you are getting a compile-only operation (just as if you had specified -c to g++).
Here's a modified/condensed Makefile that should show you what is involved:
GENCODE_SM35 := -gencode arch=compute_35,code=sm_35
GENCODE_FLAGS := $(GENCODE_SM35)
LDFLAGS := -L/usr/local/cuda/lib64 -lcudart -lcudadevrt
CCFLAGS := -m64
NVCCFLAGS := -m64 -dc
NVCC := nvcc
GCC := g++
# Debug build flags
ifeq ($(dbg),1)
CCFLAGS += -g
NVCCFLAGS += -g -G
TARGET := debug
else
TARGET := release
endif
# Common includes and paths for CUDA
INCLUDES := -I/usr/local/cuda/include -I. -I..
# Additional parameters
MAXRREGCOUNT := -po maxrregcount=16
# Target rules
all: build
build: BlackScholes
BlackScholes.o: BlackScholes.cu
$(NVCC) $(NVCCFLAGS) $(EXTRA_NVCCFLAGS) $(GENCODE_FLAGS) $(MAXRREGCOUNT) $(INCLUDES) -o $# $<
$(NVCC) -dlink $(GENCODE_FLAGS) $(MAXRREGCOUNT) -o bs_link.o $#
BlackScholes_gold.o: BlackScholes_gold.cpp
$(GCC) $(CCFLAGS) $(INCLUDES) -o $# -c $<
BlackScholes: BlackScholes.o BlackScholes_gold.o bs_link.o
$(GCC) $(CCFLAGS) -o $# $+ $(LDFLAGS) $(EXTRA_LDFLAGS)
run: build
./BlackScholes