Makefile

# Location of the CUDA Toolkit
CUDA_PATH ?= /usr/local/cuda

# architecture
HOST_ARCH   := $(shell uname -m)
TARGET_ARCH ?= $(HOST_ARCH)

# Adjust this for ARMv7 with a 32-bit filesystem
ifeq ($(TARGET_ARCH), aarch64)
    ifeq ($(shell file /sbin/init | grep 32-bit), 1)
        TARGET_ARCH=armv7l
    endif
endif

ifneq (,$(filter $(TARGET_ARCH),x86_64 aarch64 ppc64le armv7l))
    ifneq ($(TARGET_ARCH),$(HOST_ARCH))
        ifneq (,$(filter $(TARGET_ARCH),x86_64 aarch64 ppc64le))
            TARGET_SIZE := 64
        else ifneq (,$(filter $(TARGET_ARCH),armv7l))
            TARGET_SIZE := 32
        endif
    else
        TARGET_SIZE := $(shell getconf LONG_BIT)
    endif
else
    $(error ERROR - unsupported value $(TARGET_ARCH) for TARGET_ARCH!)
endif
ifneq ($(TARGET_ARCH),$(HOST_ARCH))
    ifeq (,$(filter $(HOST_ARCH)-$(TARGET_ARCH),aarch64-armv7l x86_64-armv7l x86_64-aarch64 x86_64-ppc64le))
        $(error ERROR - cross compiling from $(HOST_ARCH) to $(TARGET_ARCH) is not supported!)
    endif
endif

# operating system
HOST_OS   := $(shell uname -s 2>/dev/null | tr "[:upper:]" "[:lower:]")
TARGET_OS ?= $(HOST_OS)

ifeq ($(TARGET_OS),QNX)
override TARGET_OS := qnx
endif

ifeq (,$(filter $(TARGET_OS),linux darwin qnx QNX android))
    $(error ERROR - unsupported value $(TARGET_OS) for TARGET_OS!)
endif

# host compiler
ifeq ($(TARGET_OS),darwin)
    ifeq ($(shell expr `xcodebuild -version | grep -i xcode | awk '{print $$2}' | cut -d'.' -f1` \>= 5),1)
        HOST_COMPILER ?= clang++
    endif
else ifneq ($(TARGET_ARCH),$(HOST_ARCH))
    ifeq ($(HOST_ARCH)-$(TARGET_ARCH),x86_64-armv7l)
        ifeq ($(TARGET_OS),linux)
            HOST_COMPILER ?= arm-linux-gnueabihf-g++
        else ifeq ($(TARGET_OS),qnx)
            ifeq ($(QNX_HOST),)
                $(error ERROR - QNX_HOST must be passed to the QNX host toolchain)
            endif
            ifeq ($(QNX_TARGET),)
                $(error ERROR - QNX_TARGET must be passed to the QNX target toolchain)
            endif
            export QNX_HOST
            export QNX_TARGET
            HOST_COMPILER ?= $(QNX_HOST)/usr/bin/arm-unknown-nto-qnx6.6.0eabi-g++
        else ifeq ($(TARGET_OS),android)
            HOST_COMPILER ?= arm-linux-androideabi-g++
        endif
    else ifeq ($(TARGET_ARCH),aarch64)
        ifeq ($(TARGET_OS), linux)
            HOST_COMPILER ?= aarch64-linux-gnu-g++
        else ifeq ($(TARGET_OS), android)
            HOST_COMPILER ?= aarch64-linux-android-g++
        endif
    else ifeq ($(TARGET_ARCH),ppc64le)
        HOST_COMPILER ?= powerpc64le-linux-gnu-g++
    endif
endif
HOST_COMPILER ?= g++
NVCC          ?= $(CUDA_PATH)/bin/nvcc

# internal flags
NVCCFLAGS   := -ccbin $(HOST_COMPILER) -m${TARGET_SIZE}
CCFLAGS     :=
LDFLAGS     :=

# build flags
ifeq ($(TARGET_OS),darwin)
    LDFLAGS += -rpath $(CUDA_PATH)/lib
    CCFLAGS += -arch $(HOST_ARCH)
else ifeq ($(HOST_ARCH)-$(TARGET_ARCH)-$(TARGET_OS),x86_64-armv7l-linux)
    LDFLAGS += --dynamic-linker=/lib/ld-linux-armhf.so.3
    CCFLAGS += -mfloat-abi=hard
else ifeq ($(TARGET_OS),android)
    LDFLAGS += -pie
    CCFLAGS += -fpie -fpic -fexceptions
endif

ifneq ($(TARGET_ARCH),$(HOST_ARCH))
    ifeq ($(TARGET_ARCH)-$(TARGET_OS),armv7l-linux)
        ifneq ($(TARGET_FS),)
            GCCVERSIONLTEQ46 := $(shell expr `$(HOST_COMPILER) -dumpversion` \<= 4.6)
            ifeq ($(GCCVERSIONLTEQ46),1)
                CCFLAGS += --sysroot=$(TARGET_FS)
            endif
            LDFLAGS += --sysroot=$(TARGET_FS)
            LDFLAGS += -rpath-link=$(TARGET_FS)/lib
            LDFLAGS += -rpath-link=$(TARGET_FS)/usr/lib
            LDFLAGS += -rpath-link=$(TARGET_FS)/usr/lib/arm-linux-gnueabihf
        endif
    endif
endif

# Debug build flags
ifeq ($(DEBUG),1)
      CCFLAGS += -g -O0
      BUILD_TYPE := debug
else
      BUILD_TYPE := release
endif

ALL_CCFLAGS :=
ALL_CCFLAGS += $(NVCCFLAGS)
ALL_CCFLAGS += $(EXTRA_NVCCFLAGS)
ALL_CCFLAGS += $(addprefix -Xcompiler ,$(CCFLAGS))
ALL_CCFLAGS += $(addprefix -Xcompiler ,$(EXTRA_CCFLAGS))

SAMPLE_ENABLED := 1

ALL_LDFLAGS :=
ALL_LDFLAGS += $(ALL_CCFLAGS)
ALL_LDFLAGS += $(addprefix -Xlinker ,$(LDFLAGS))
ALL_LDFLAGS += $(addprefix -Xlinker ,$(EXTRA_LDFLAGS))

# Common includes and paths for CUDA
INCLUDES := -I$(CUDA_PATH)/include
LIBRARIES := -L$(CUDA_PATH)/lib64

ifeq ($(TARGET_ARCH), ppc64le)
INCLUDES += -I$(CUDA_PATH)/targets/ppc64le-linux/include
LIBRARIES += -L$(CUDA_PATH)/targets/ppc64le-linux/lib
endif

CUDNN_INCLUDE_PATH ?= /usr/include
INCLUDES += -I$(CUDNN_INCLUDE_PATH)

CUBLAS_LIB_PATH ?= $(CUDA_PATH)/lib64
CUDNN_LIB_PATH ?= /usr/lib/x86_64-linux-gnu

LIBRARIES += -L$(CUBLAS_LIB_PATH)
LIBRARIES += -L$(CUDNN_LIB_PATH)

################################################################################

ifeq (,$(filter $(MAKECMDGOALS),clean clobber))

# Gencode arguments
# Setting SMS inside samples_common.mk
include ./samples_common.mk

$(info CUDA VERSION: $(CUDA_VERSION))
$(info TARGET ARCH: $(TARGET_ARCH))
$(info TARGET OS: $(TARGET_OS))
$(info SMS: $(SMS))

ifeq ($(SMS),)
$(info >>> WARNING - no SM architectures have been specified - waiving sample <<<)
SAMPLE_ENABLED := 0
endif

ifeq ($(GENCODE_FLAGS),)
# Generate SASS code for each SM architecture listed in $(SMS)
$(foreach sm,$(SMS),$(eval GENCODE_FLAGS += -gencode arch=compute_$(sm),code=sm_$(sm)))

# Generate PTX code from the highest SM architecture in $(SMS) to guarantee forward-compatibility
HIGHEST_SM := $(lastword $(sort $(SMS)))
ifneq ($(HIGHEST_SM),)
GENCODE_FLAGS += -gencode arch=compute_$(HIGHEST_SM),code=compute_$(HIGHEST_SM)
endif
endif

ifeq ($(CUBLASLT), true)
LIBRARIES += -lcublasLt
endif

INCLUDES += -I./include
LIBRARIES += -L. -lcublas -lcudnn -lcudart -lstdc++ -lm

ifeq ($(SAMPLE_ENABLED),0)
EXEC ?= @echo "[@]"
endif

endif

################################################################################

# Target rules
all: build

build: Mnist

check.deps:
ifeq ($(SAMPLE_ENABLED),0)
	@echo "Sample will be waived due to the above missing dependencies"
else
	@echo "Sample is ready - all dependencies have been met"
endif

CUSRCS = $(wildcard ./src/*.cu)
CPPSRCS = $(wildcard ./src/*.cpp)

OBJ = main.o
OBJ += $(CPPSRCS:.cpp=.o)
OBJ += $(CUSRCS:.cu=.o)
INC = $(wildcard *.h)

Mnist: $(OBJ)
	$(EXEC) $(NVCC) $(ALL_LDFLAGS) $(GENCODE_FLAGS) -o $@ $+ $(INCLUDES) $(LIBRARIES)

%.o: %.cpp $(INC)
	$(EXEC) $(HOST_COMPILER) $(INCLUDES) $(CCFLAGS) $(EXTRA_CCFLAGS) -o $@ -c $<

%.o: %.cu $(INC)
	$(EXEC) $(NVCC) $(INCLUDES) $(ALL_CCFLAGS) $(GENCODE_FLAGS) -o $@ -c $<

run: build
	$(EXEC) ./Mnist

clean:
	rm -rf *o
	rm -rf Mnist

clobber: clean