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else
# linux defaults
ifndef CC
export CC = gcc
endif
ifndef CXX
export CXX = g++
endif
endif

export LDFLAGS= -pthread -lm $(ADD_LDFLAGS) $(DMLC_LDFLAGS) $(PLUGIN_LDFLAGS)
export CFLAGS=  -std=c++11 -Wall -Wno-unknown-pragmas -Iinclude $(ADD_CFLAGS) $(PLUGIN_CFLAGS)
CFLAGS += -I$(DMLC_CORE)/include -I$(RABIT)/include -I$(GTEST_PATH)/include
#java include path
export JAVAINCFLAGS = -I${JAVA_HOME}/include -I./java

ifeq ($(TEST_COVER), 1)
	CFLAGS += -g -O0 -fprofile-arcs -ftest-coverage
else
	CFLAGS += -O3 -funroll-loops
ifeq ($(USE_SSE), 1)
	CFLAGS += -msse2
endif
endif

ifndef LINT_LANG
	LINT_LANG= "all"
endif

ifeq ($(UNAME), Windows)
	XGBOOST_DYLIB = lib/xgboost.dll
	JAVAINCFLAGS += -I${JAVA_HOME}/include/win32
else
ifeq ($(UNAME), Darwin)
	XGBOOST_DYLIB = lib/libxgboost.dylib
	CFLAGS += -fPIC
else
	XGBOOST_DYLIB = lib/libxgboost.so
	CFLAGS += -fPIC
endif
endif

ifeq ($(UNAME), Linux)
	LDFLAGS += -lrt
	JAVAINCFLAGS += -I${JAVA_HOME}/include/linux
endif

ifeq ($(UNAME), Darwin)
	JAVAINCFLAGS += -I${JAVA_HOME}/include/darwin
endif

OPENMP_FLAGS =
ifeq ($(USE_OPENMP), 1)
	OPENMP_FLAGS = -fopenmp
else
	OPENMP_FLAGS = -DDISABLE_OPENMP
endif
CFLAGS += $(OPENMP_FLAGS)

# for using GPUs
GPU_COMPUTE_VER ?= 35 50 52 60 61
NVCC = nvcc
INCLUDES = -Iinclude -I$(DMLC_CORE)/include -I$(RABIT)/include
INCLUDES += -I$(CUB_PATH)
INCLUDES += -I$(GTEST_PATH)/include
CODE = $(foreach ver,$(GPU_COMPUTE_VER),-gencode arch=compute_$(ver),code=sm_$(ver))
NVCC_FLAGS = --std=c++11 $(CODE) $(INCLUDES) -lineinfo --expt-extended-lambda
NVCC_FLAGS += -Xcompiler=$(OPENMP_FLAGS) -Xcompiler=-fPIC
ifeq ($(PLUGIN_UPDATER_GPU),ON)
  CUDA_ROOT = $(shell dirname $(shell dirname $(shell which $(NVCC))))
  INCLUDES += -I$(CUDA_ROOT)/include -Inccl/src/
  LDFLAGS += -L$(CUDA_ROOT)/lib64 -lcudart  -lcudadevrt -Lnccl/build/lib/ -lnccl_static -lm -ldl -lrt
  CFLAGS += -DXGBOOST_USE_CUDA
endif

# specify tensor path
.PHONY: clean all lint clean_all doxygen rcpplint pypack Rpack Rbuild Rcheck java pylint

all: lib/libxgboost.a $(XGBOOST_DYLIB) xgboost

$(DMLC_CORE)/libdmlc.a: $(wildcard $(DMLC_CORE)/src/*.cc $(DMLC_CORE)/src/*/*.cc)
	+ cd $(DMLC_CORE); $(MAKE) libdmlc.a config=$(ROOTDIR)/$(config); cd $(ROOTDIR)

$(RABIT)/lib/$(LIB_RABIT): $(wildcard $(RABIT)/src/*.cc)
	+ cd $(RABIT); $(MAKE) lib/$(LIB_RABIT) USE_SSE=$(USE_SSE); cd $(ROOTDIR)

jvm: jvm-packages/lib/libxgboost4j.so

SRC = $(wildcard src/*.cc src/*/*.cc)
ALL_OBJ = $(patsubst src/%.cc, build/%.o, $(SRC)) $(PLUGIN_OBJS)
AMALGA_OBJ = amalgamation/xgboost-all0.o
LIB_DEP = $(DMLC_CORE)/libdmlc.a $(RABIT)/lib/$(LIB_RABIT)
ALL_DEP = $(filter-out build/cli_main.o, $(ALL_OBJ)) $(LIB_DEP)
CLI_OBJ = build/cli_main.o
include tests/cpp/xgboost_test.mk

# order of this rule matters wrt %.cc rule below!
build/%.o: src/%.cu
	@mkdir -p $(@D)
	$(NVCC) -c $(NVCC_FLAGS) $< -o $@

build/%.o: src/%.cc
	@mkdir -p $(@D)
	$(CXX) $(CFLAGS) -MM -MT build/$*.o $< >build/$*.d
	$(CXX) -c $(CFLAGS) $< -o $@

# order of this rule matters wrt %.cc rule below!
build_plugin/%.o: plugin/%.cu build_nccl
	@mkdir -p $(@D)
	$(NVCC) -c $(NVCC_FLAGS) $< -o $@

build_plugin/%.o: plugin/%.cc
	@mkdir -p $(@D)
	$(CXX) $(CFLAGS) -MM -MT build_plugin/$*.o $< >build_plugin/$*.d
	$(CXX) -c $(CFLAGS) $< -o $@

build_nccl:
	@mkdir -p build/include
	cd build/include ; ln -sf ../../nccl/src/nccl.h .
	cd nccl ; make -j ; cd ..

# The should be equivalent to $(ALL_OBJ)  except for build/cli_main.o
amalgamation/xgboost-all0.o: amalgamation/xgboost-all0.cc
	$(CXX) -c $(CFLAGS) $< -o $@

# Equivalent to lib/libxgboost_all.so