#
# Build rules
#

# Keep secondary files
.SECONDARY:

include $(ROOT_DIR)/Makefile.config
ifeq ($(strip $(DIR_TCLAP)),)
$(error "Build requires TCLAP package (http://tclap.sourceforge.net)")
endif

# if install, read build details
ifeq "$(MAKE-TARGET)" "install"
include $(ROOT_DIR)/.makefile.build
endif

# Object directory
OBJ_DIR		= .linux

# Use gcc4
CXX		= g++

# Use rpath or not
WITH_RPATH	?= 1

LDFLAGS		= 
ifeq "$(MAKE-TARGET)" "static"
WITH_RPATH	= 0
LDFLAGS		+= -static -lboost_system -lboost_thread -lpthread
endif

# check BOOST
USE_BOOST ?= 1

# check boost threads
USE_BOOST_THREAD ?= 1

ifeq ($(strip $(LIB_BOOST_THREAD)),)
USE_BOOST_THREAD = 0
USE_THREADPOOL = 0
endif

ifeq ($(strip $(DIR_THREADPOOL)),)
USE_THREADPOOL = 0
endif

# Library and binary directories
BASE_DIR	:= $(shell cd $(ROOT_DIR) ; pwd)

# Install directories
# With rpath, enforce install dir same as build
# Without, use same as build as default
# prefix - install topdir
# libdir/bindir - install lib/bin
# BASE_DIR - build top dir
# LIB_DIR/BIN_DIR - build top dir
#
# with rpath :
#   build and install dirs are the same
#   default top is BASE_DIR
# else :
#   build is always under BASE_DIR
#   install under prefix (default BASE_DIR)
#
#ifeq ($(WITH_RPATH),1)
#prefix		?= $(BASE_DIR)
#libdir		= $(prefix)/lib
#bindir		= $(prefix)/bin
##LIB_DIR		:= $(shell mkdir -p $(libdir) ; cd $(libdir) ; pwd)
##BIN_DIR		:= $(shell mkdir -p $(bindir) ; cd $(bindir) ; pwd)
#LIB_DIR		:= $(libdir)
#BIN_DIR		:= $(bindir)
#else
#LIB_DIR		:= $(shell mkdir -p $(BASE_DIR)/lib ; cd $(BASE_DIR)/lib ; pwd)
#BIN_DIR		:= $(shell mkdir -p $(BASE_DIR)/bin ; cd $(BASE_DIR)/bin ; pwd)
#prefix		?= $(BASE_DIR)
#libdir		?= $(LIB_DIR)
#bindir		?= $(BIN_DIR)
#endif
LIB_DIR		:= $(shell mkdir -p $(BASE_DIR)/lib ; cd $(BASE_DIR)/lib ; pwd)
BIN_DIR		:= $(shell mkdir -p $(BASE_DIR)/bin ; cd $(BASE_DIR)/bin ; pwd)
prefix		?= $(BASE_DIR)
libdir		?= $(LIB_DIR)
bindir		?= $(BIN_DIR)
LIB_INSTDIR := $(prefix)/lib
BIN_INSTDIR := $(prefix)/bin

# Install user/group
INST_USR	 = $(shell whoami)
INST_GRP	?= $(shell groups | cut -f 1 -d ' ' )

# Establish install command
# if rpath -> always chown
# else
#   if targetdir==installdir -> chown
#   else install
# endif
#ifeq ($(WITH_RPATH),1)
#INST_CMD	 = chown $(INST_USR).$(INST_GRP)
#else
TARGET_DIR	= $(dir $(TARGET))
rpTARGET	= $(realpath $(firstword $(TARGET_DIR)))
rpINSTDIR	= $(realpath $(prefix)/$(INSTDIR))
ifeq ($(rpTARGET),$(rpINSTDIR))
INST_CMD	 = chown $(INST_USR).$(INST_GRP)
else
INST_CMD	 = mkdir -p $(prefix)/$(INSTDIR); install -D -m 755 -g $(INST_GRP) -t $(prefix)/$(INSTDIR)
endif
#endif

# Definitions concerning build environment
CPPFLAGS	+= -DBRH_BUILD_ENV="\"$(shell uname -s -r -v -m -i -p -o)\""
CPPFLAGS	+= -DBRH_BUILD_TIME="\"$(shell date)\""

# Default pre-processor flags
CPPFLAGS	+= -DBASE_DIR="\"$(BASE_DIR)\""
CPPFLAGS	+= -D_REENTRANT
CPPFLAGS	+= -D_XOPEN_SOURCE

# c++ standard
CPPFLAGS	+= -std=c++11
CXXFLAGS	+= -std=c++11

# debug flag
ifeq ($(USE_DEBUG),3)
CXXFLAGS	+= -fno-inline -fbounds-check
else ifeq ($(USE_DEBUG),2)
CPPFLAGS	+= -DBRH_DEBUG
CXXFLAGS	+= -fno-inline -fbounds-check
else ifeq ($(USE_DEBUG),1)
CPPFLAGS	+= -DBRH_CHECK_IT
CXXFLAGS	+= -finline-functions -fbounds-check
else
CXXFLAGS	+= -finline-functions
endif

# Default compiler flags
CXXFLAGS	+= -fPIC
CXXFLAGS	+= -MMD
CXXFLAGS	+= -g
CXXFLAGS	+= -Wall -Werror
CXXFLAGS	+= -fexceptions
#CXXFLAGS	+= -fno-inline
CXXFLAGS	+= -O3
#CXXFLAGS	+= -O0
CXXFLAGS	+= -I$(BASE_DIR)/src
#CXXFLAGS	+= -std=c++11
#CXXFLAGS	+= -pg
#LDFLAGS		+= -pg

# BRH flags
ifeq ($(USE_BRH),1)
BRH_DIR		= $(BASE_DIR)
CPPFLAGS	+= -I$(BRH_DIR)/src
ifeq ($(WITH_RPATH),1)
LDFLAGS		+= -L$(LIB_DIR) -Wl,-rpath,$(LIB_INSTDIR) -lboost_system -lboost_thread -lpthread
else
LDFLAGS		+= -L$(LIB_DIR) -lboost_system -lboost_thread -lpthread
endif
LDLIBS		+= -lbrh -lboost_system -lboost_thread -lpthread
endif

ifeq ($(USE_BOOST_THREAD),1)
CPPFLAGS	+= -pthread -DHAS_BOOST_THREADS
LDFLAGS		+= -pthread -L$(DIR_BOOST_LIB) -lboost_system -lboost_thread -lpthread -L$(DIR_BOOST_THREAD) -l$(LIB_BOOST_THREAD)
endif

ifeq ($(USE_THREADPOOL),1)
CPPFLAGS	+= -DHAS_BOOST_THREADPOOL
CPPFLAGS	+= -I$(DIR_THREADPOOL)
endif

ifeq ($(USE_BOOST),1)
CPPFLAGS	+= -I$(DIR_BOOST_INC)
endif

# TCLAP flags
ifeq ($(USE_TCLAP),1)
CPPFLAGS	+= -I$(DIR_TCLAP)
endif

# BOOST flags
ifeq ($(USE_THREAD),1)
endif

# Check file type
ifeq ($(suffix $(firstword $(SOURCES))),.cpp)
IS_CPP		= 1
else
IS_CPP		= 0
endif

# List of objects
ifeq ($(IS_CPP),1)
OBJECTS		= $(SOURCES:%.cpp=$(OBJ_DIR)/%.o)
endif

# Default build
default:	all

ifeq ($(IS_CPP),1)
# Build a binary
$(BIN_DIR)/%: $(OBJECTS) Makefile $(BASE_DIR)/Makefile.rules
	@echo "  Linking $(@F)"
	@mkdir -p $(@D)
	@$(LINK.cc) $(LDFLAGS) -o $@ $(OBJECTS) $(LDLIBS)

# Build a shared library
$(LIB_DIR)/%.so: $(OBJECTS) Makefile $(BASE_DIR)/Makefile.rules
	@echo "  Linking $(@F)"
	@mkdir -p $(@D)
	@$(LINK.cc) -shared -o $@ $(OBJECTS) $(LDLIBS)

# Build a static library
$(LIB_DIR)/%.a: $(OBJECTS) Makefile $(BASE_DIR)/Makefile.rules
	@echo "  Linking $(@F)"
	@mkdir -p $(@D)
	@ar rcs $@ $(OBJECTS)

# Include dependency files
-include $(OBJECTS:%.o=%.d)

# Build an object file
$(OBJ_DIR)/%.o: %.cpp Makefile
	@echo "  Compiling $<"
	@mkdir -p $(@D)
	@$(COMPILE.cc) -o $@ $<
else
$(BIN_DIR)/%.py: %.py
	@echo "  Copying $< to target dir"
	@cp -f $< $@
endif



# Main targets are phony
.PHONY: default all clean_target clean_obj doc clean_doc clean install static

# Build target
all:	$(TARGET)

static:	$(TARGET)

# Clean objects
clean_obj:
	@$(RM) -r $(OBJ_DIR)

# Clean build
clean_target:
	@$(RM) -r $(OBJ_DIR) $(TARGET)

# Build documentation
doc:
	@$(MAKE) -C $(BASE_DIR) $@

# Clean build
clean: clean_target

# Install
install:
#	@echo "rpT   : $(rpTARGET)"
#	@echo "rpI   : $(rpINSTDIR)"
#	@echo "rpath : $(WITH_RPATH)"
#	@echo "inst  : $(INST_CMD) $(TARGET)"
	@target="$(TARGET)"; \
	[ $${#target} -gt 0 ] || target="$(OUTPUT)"; \
	for f in $${target}; do \
	    fname=`basename $$f`; \
	    if [ -f $$f ]; then \
	       echo "Installing in $(prefix)/$(INSTDIR)    <$$fname>"; \
	       $(INST_CMD) $$f; \
	    fi; \
	done