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	DMLC_CORE = dmlc-core
endif

ifndef RABIT
	RABIT = rabit
endif

ROOTDIR = $(CURDIR)

# workarounds for some buggy old make & msys2 versions seen in windows
ifeq (NA, $(shell test ! -d "$(ROOTDIR)" && echo NA ))
        $(warning Attempting to fix non-existing ROOTDIR [$(ROOTDIR)])
        ROOTDIR := $(shell pwd)
        $(warning New ROOTDIR [$(ROOTDIR)] $(shell test -d "$(ROOTDIR)" && echo " is OK" ))
endif
MAKE_OK := $(shell "$(MAKE)" -v 2> /dev/null)
ifndef MAKE_OK
        $(warning Attempting to recover non-functional MAKE [$(MAKE)])
        MAKE := $(shell which make 2> /dev/null)
        MAKE_OK := $(shell "$(MAKE)" -v 2> /dev/null)
endif
$(warning MAKE [$(MAKE)] - $(if $(MAKE_OK),checked OK,PROBLEM))

ifeq ($(OS), Windows_NT)
	UNAME="Windows"
else
	UNAME=$(shell uname)
endif

include $(config)
ifeq ($(USE_OPENMP), 0)
	export NO_OPENMP = 1
endif
include $(DMLC_CORE)/make/dmlc.mk

# include the plugins
ifdef XGB_PLUGINS
include $(XGB_PLUGINS)
endif

# set compiler defaults for OSX versus *nix
# let people override either
OS := $(shell uname)
ifeq ($(OS), Darwin)
ifndef CC
export CC = $(if $(shell which clang), clang, gcc)
endif
ifndef CXX
export CXX = $(if $(shell which clang++), clang++, g++)
endif
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/