Mult-output files with Makefile - c++

Question

I am a cuda programmer and new in vscode and Makefile environment.
For a better programming, I use multiple .cu files for my functions. Thus, for the pull_model and build_meshgrid functions, the makefile becomes:
# Target rules
all: build
build: kernel
check.deps:
ifeq ($(SAMPLE_ENABLED),0)
#echo "Launch file will be waived due to the above missing dependencies"
else
#echo "Launch file is ready - all dependencies have been met"
endif
kernel: kernel.o Engine/Engine.o Engine/pull_model.o Engine/build_meshgrid.o
$(EXEC) $(NVCC) $(ALL_LDFLAGS) $(GENCODE_FLAGS) -o $# $+ $(LIBRARIES)
$(EXEC) mkdir -p bin/$(TARGET_ARCH)/$(TARGET_OS)/$(BUILD_TYPE)
$(EXEC) cp $# bin/$(TARGET_ARCH)/$(TARGET_OS)/$(BUILD_TYPE)
%.o: %.cu
$(EXEC) $(NVCC) $(INCLUDES) $(ALL_CCFLAGS) $(GENCODE_FLAGS) -o $# -c $<
run: build
$(EXEC) ./kernel
testrun: build
clean:
rm -f kernel *.o Engine/*.o
rm -rf bin/$(TARGET_ARCH)/$(TARGET_OS)/$(BUILD_TYPE)/kernel
clobber: clean
I need to reduce the kernel somehow, like this:
kernel: kernel.o Engine/*.o
$(EXEC) $(NVCC) $(ALL_LDFLAGS) $(GENCODE_FLAGS) -o $# $+ $(LIBRARIES)
$(EXEC) mkdir -p bin/$(TARGET_ARCH)/$(TARGET_OS)/$(BUILD_TYPE)
$(EXEC) cp $# bin/$(TARGET_ARCH)/$(TARGET_OS)/$(BUILD_TYPE)
So, all .cu files under Engine folder are targed.
Best Regards!

Answer 1

Well, you can't use Engine/*.o because when you run your makefile, no object files exist and so this wildcard will expand to nothing, then nothing will be built (except kernel.o).
It's a catch-22 because you can't just tell make "build all the object files that you would build if you knew which objects to build!"
If what you want is to build object files for all source files in the Engine directory, you can tell make to do that:
SRCS := $(wildcard Engine/*.c)
OBJS := $(SRCS:%.c=%.o)
kernel: kernel.o $(OBJS)
....