###############################################################################
## @file config.mk
## @author Y.M. Morgan
## @date 2011/05/14
###############################################################################

###############################################################################
## Make sure that there are no spaces in the absolute path; the build system
## can't deal with them.
###############################################################################

ifneq ("$(words $(shell pwd))","1")
	$(error Top directory contains space characters)
endif

###############################################################################
## Host/Target OS.
###############################################################################

# Host OS
ifneq ("$(shell echo $$OSTYPE | grep msys)","")
	HOST_OS := Windows
	HOST_EXE_SUFFIX := .exe
	HOST_SHARED_LIB_SUFFIX := .dll
else
	HOST_OS := Linux
	HOST_EXE_SUFFIX :=
	HOST_SHARED_LIB_SUFFIX := .so
endif

# Target OS : default to HOST_OS unless set
ifndef TARGET_OS
	TARGET_OS := $(HOST_OS)
endif

# Exe/dll suffix under mingw
TARGET_STATIC_LIB_SUFFIX := .a
ifeq ("$(TARGET_OS)","Windows")
	DIR_SUFFIX := _mingw32
	TARGET_EXE_SUFFIX := .exe
	TARGET_SHARED_LIB_SUFFIX := .dll
else
	DIR_SUFFIX :=
	TARGET_EXE_SUFFIX :=
	TARGET_SHARED_LIB_SUFFIX := .so
endif

ifeq ("$(TARGET_OS)","Windows")
	# may be overridden in make command line
	STATIC := 1
	TARGET_GLOBAL_CFLAGS += -D__MINGW_FEATURES__=0
	TARGET_GLOBAL_LDFLAGS += -Wl,--enable-auto-import
	ifeq ("$(STATIC)","1")
		TARGET_GLOBAL_LDFLAGS += -Wl,-Bstatic
	endif
	
else ifeq ("$(TARGET_OS)","Android")
	TARGET_GLOBAL_CFLAGS += -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ \
	                         -fpic -ffunction-sections -funwind-tables -fstack-protector \
	                         -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -fno-exceptions -mthumb \
	                         -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 
	TARGET_GLOBAL_CPPFLAGS += -fno-rtti -Wa,--noexecstack
	TARGET_GLOBAL_LDFLAGS += 
endif

# define the target OS type for the compilation system ...
TARGET_GLOBAL_CFLAGS += -D__TARGET_OS__$(TARGET_OS)
# basic define of the build time :
TARGET_GLOBAL_CFLAGS += -DBUILD_TIME="\"$(shell date)\"" \

ifeq ($(DEBUG),1)
	TARGET_GLOBAL_CFLAGS += -DDEBUG_LEVEL=3
	ifeq ("$(OPTIMISE)","1")
		TARGET_GLOBAL_CFLAGS += -O2
	endif
else
	TARGET_GLOBAL_CFLAGS += -DDEBUG_LEVEL=1
endif


# To be able to use ccache with pre-complied headers, some env variables are required
CCACHE := 
ifeq ("$(CCACHE)","1")
	ifneq ("$(shell which ccache)","")
		CCACHE := CCACHE_SLOPPINESS=time_macros ccache
		TARGET_GLOBAL_CFLAGS += -fpch-preprocess
	endif
else
	CCACHE := 
endif

# Pre-compiled header generation flag
ifneq ("$(CLANG)","1")
  TARGET_PCH_FLAGS := -c
else
  TARGET_PCH_FLAGS := -x c++-header
endif

# Architecture
#ifndef TARGET_ARCH
#  ifneq ("$(shell $(GCC) -dumpmachine | grep 64)","")
#    TARGET_ARCH := AMD64
#  else
#    TARGET_ARCH := X86
#  endif
#endif

# Update flags based on architecture
# 64-bit requires -fPIC to build shared libraries
#ifeq ("$(TARGET_ARCH)","AMD64")
#  TARGET_GLOBAL_CFLAGS += -m64 -fPIC
#else
#  TARGET_GLOBAL_CFLAGS += -m32
#endif

###############################################################################
## Variables based on DEBUG/STATIC.
###############################################################################

#ifeq ("$(DEBUG)","0")
#  TARGET_GLOBAL_CFLAGS += -O2 -g -DNDEBUG
#  TARGET_OUT_INTERMEDIATES := $(TOP_DIR)/build_gcc$(DIR_SUFFIX)/release
#  TARGET_OUT := $(TOP_DIR)/out_gcc$(DIR_SUFFIX)/release
#else
#  TARGET_GLOBAL_CFLAGS += -O0 -g -DDEBUG -D_DEBUG
#  TARGET_OUT_INTERMEDIATES := $(TOP_DIR)/build_gcc$(DIR_SUFFIX)/debug
#  TARGET_OUT := $(TOP_DIR)/out_gcc$(DIR_SUFFIX)/debug
#endif

###############################################################################
## Determine gcc path and version.
###############################################################################

GCC_PATH := $(shell which $(GCC))

ifneq ("$(CLANG)","1")
GCC_VERSION := $(shell $(GCC) --version | head -1 | sed "s/.*\([0-9]\.[0-9]\.[0-9]\).*/\1/")
else
GCC_VERSION := $(shell $(GCC) --version | head -1 | sed "s/.*\([0-9]\.[0-9]-[0-9]\).*/\1/")
endif