Help with separate compilation and host linking

Accelerated Computing CUDA CUDA Programming and Performance
1

Hey team,

I’m trying to compile a code using separate compilation and link it all together with clang++.

Everything compiles fine but I’m getting an error in the linking step

Undefined symbols for architecture x86_64:
  "d_moveParticles(double3*, double3*, double, int)", referenced from:
      moveParticles(cudaGraphicsResource**, double3*, double, int) in moveAtoms.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [bin/CUDADSMC] Error 1

d_moveParticles is a global function that is called by the host function moveParticles.

Here is my makefile

NVCCFLAGS = -m 64 -arch=sm_35

BUILDDIR = bin/
OBJDIR   = $(BUILDDIR)obj/
SRCDIR   = src/

EXEC = $(BUILDDIR)CUDADSMC

INCLUDE += -I include/

all: $(EXEC)

$(EXEC): $(addprefix $(OBJDIR), main.o gpuCode.o magneticField.o moveAtoms.o setUp.o openGLhelpers.o shader.o)
	@echo 'Building file: $<'
	@echo 'Invoking: NVCC Linker'
	clang++ -o $@ $(INCLUDE) $^ $(LIB) $(CUDA_LIB) -lc++ -v -lcudart -lglfw3 -lGLEW -framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo
	@echo "Finished building: $< $(OK_STRING)"
	@echo ' '

$(OBJDIR)gpuCode.o: $(addprefix $(OBJDIR), setUp.o moveAtoms.o magneticField.o)
	@echo 'Linking device object files: $<'
	@echo 'Invoking: NVCC Linker'
	$(NVCC) $(NVCCFLAGS) -dlink -o $@ $^
	@echo "Finished linking: $< $(OK_STRING)"
	@echo ' '

$(OBJDIR)%.o: $(SRCDIR)%.cpp
	@echo 'Building file: $<'
	@echo 'Invoking: clang Compiler'
	clang++ $(INCLUDE) $(CUDA_INC) -o $@ -c $?
	@echo "Finished building: $< $(OK_STRING)"
	@echo ' '

$(OBJDIR)%.o: $(SRCDIR)%.cu
	@echo 'Building file: $<'
	@echo 'Invoking: NVCC Compiler'
	$(NVCC) $(NVCCFLAGS) -x cu $(INCLUDE) -o $@ -dc $? -D CUDA7
	@echo "Finished building: $< $(OK_STRING)"
	@echo ' '

If it makes a difference both d_moveParticles and moveParticles are in the moveAtoms.cu file.

I’m hoping there is a code whizz out there who can help me out. Let me know if anything else is unclear.

Thanks heaps

Chris

2

Sorry gang,

I was being silly, I had made an incorrect function call within the code.

Apart from that, separate compilation with host linking works great :-)

Chris