# Copyright 2005-2010 Intel Corporation.  All Rights Reserved.
#
# This file is part of Threading Building Blocks.
#
# Threading Building Blocks is free software; you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# version 2 as published by the Free Software Foundation.
#
# Threading Building Blocks is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Threading Building Blocks; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# As a special exception, you may use this file as part of a free software
# library without restriction.  Specifically, if other files instantiate
# templates or use macros or inline functions from this file, or you compile
# this file and link it with other files to produce an executable, this
# file does not by itself cause the resulting executable to be covered by
# the GNU General Public License.  This exception does not however
# invalidate any other reasons why the executable file might be covered by
# the GNU General Public License.

ifndef tbb_os

  # Windows sets environment variable OS; for other systems, ask uname
  ifeq ($(OS),)
    OS:=$(shell uname)
    ifeq ($(OS),)
      $(error "Cannot detect operating system")
    endif
    export tbb_os=$(OS)
  endif

  ifeq ($(OS), Windows_NT)
    export tbb_os=windows
  endif
  ifeq ($(OS), Linux)
    export tbb_os=linux
  endif
  ifeq ($(OS), Darwin)
    export tbb_os=macos
  endif

endif # !tbb_os

ifeq ($(wildcard $(tbb_root)/build/$(tbb_os).inc),)
  $(error "$(tbb_os)" is not supported. Add build/$(tbb_os).inc file with os-specific settings )
endif

# detect arch and runtime versions, provide common os-specific definitions
include $(tbb_root)/build/$(tbb_os).inc

ifeq ($(arch),)
 $(error Architecture not detected)
endif
ifeq ($(runtime),)
 $(error Runtime version not detected)
endif
ifeq ($(wildcard $(tbb_root)/build/$(tbb_os).$(compiler).inc),)
  $(error Compiler "$(compiler)" is not supported on $(tbb_os). Add build/$(tbb_os).$(compiler).inc file with compiler-specific settings )
endif

ifdef target
 ifeq ($(wildcard $(tbb_root)/build/$(target).inc),)
  $(error "$(target)" is not supported. Add build/$(target).inc file)
 endif
 include $(tbb_root)/build/$(target).inc
endif

# Support for running debug tests to release library and vice versa
flip_cfg=$(subst _flipcfg,_release,$(subst _release,_debug,$(subst _debug,_flipcfg,$(1))))
cross_cfg = $(if $(crosstest),$(call flip_cfg,$(1)),$(1))

ifdef BUILDING_PHASE
 # Setting default configuration to release
 cfg?=release
 # No lambas or other C++0x extensions by default for compilers that implement them as experimental features
 lambdas ?= 0
 cpp0x ?= 0
 # include compiler-specific build configurations
 -include $(tbb_root)/build/$(tbb_os).$(compiler).inc
 ifdef extra_inc
  -include $(tbb_root)/build/$(extra_inc)
 endif
endif
ifneq ($(BUILDING_PHASE),1)
 # definitions for top-level Makefiles
 origin_build_dir:=$(origin tbb_build_dir)
 tbb_build_dir?=$(tbb_root)$(SLASH)build
 tbb_build_prefix?=$(tbb_os)_$(arch)_$(compiler)_$(runtime)
 work_dir=$(tbb_build_dir)$(SLASH)$(tbb_build_prefix)
 ifneq ($(BUILDING_PHASE),0)
  work_dir:=$(work_dir)
  # assign new value for tbb_root if path is not absolute (the filter keeps only /* paths)
  ifeq ($(filter /% $(SLASH)%, $(subst :, ,$(tbb_root)) ),)
   ifeq ($(origin_build_dir),undefined)
    override tbb_root:=../..
   else
    override tbb_root:=$(CWD)/$(tbb_root)
   endif
  endif
  export tbb_root
 endif # BUILDING_PHASE != 0
endif  # BUILDING_PHASE != 1
