#	BuildConfig/DetectPlatform.rules
#	Author: Patrick Baggett <ptbaggett@762studios.com>
#	Created: 11/15/2011
#
#	Purpose:
#
#	OS/architecture detection rules. Requires GNU Make
#
#	License:
#
#	This program is free software. It comes without any warranty, to
#	the extent permitted by applicable law. You can redistribute it
#	and/or modify it under the terms of the Do What The Fuck You Want
#	To Public License, Version 2, as published by Sam Hocevar. See
#	http://sam.zoy.org/wtfpl/COPYING for more details.

# Allow user overrides of $OS and $ARCH

#==============================
# Detect operating system
#==============================
ifeq ($(OS),)
	OS := $(shell uname)
	ifeq ($(OS),SunOS)
		OS := Solaris
	endif
	ifeq ($(findstring Windows,$(OS)),Windows) # *Windows* -> Windows
		OS := Windows
	endif

	ifeq ($(findstring MINGW,$(OS)),MINGW) # *MINGW* -> Windows
		OS := Windows
	endif
endif

# Detect when the Win32 environment variable "Windows_NT" is set and normalize it
ifeq ($(OS),Windows_NT)
	OS := Windows
endif

#==============================
# Detect processor arch
# =============================
ifeq ($(ARCH),)
	ifeq ($(OS),Solaris) #Solaris likes "-p" instead of "-m"
		ARCH := $(shell uname -p)
	else
		ARCH := $(shell uname -m)
	endif
	
	#Replace "i<x>86" with "x86", where <x> can be [x, digit]
	ARCH := $(shell echo $(ARCH) | sed s/i[x0-9]86/x86/)
	
	#Replace "powerpc" with "ppc"
	ARCH := $(shell echo $(ARCH) | sed s/powerpc/ppc/)

	ifeq ($(ARCH),sparc64) #Linux on UltraSPARC gives sparc64 when running 64-bit kernel
		ARCH := sparc
	endif

	ifeq ($(ARCH),mips64) #Linux/mips64 kernel, but probably don't want 64-bit app
		ARCH := mips
	endif	
	
	ifeq ($(ARCH),amd64) # "amd64" -> "x86-64"
		ARCH := x86-64
	endif
	
	ifeq ($(ARCH),x86_64) # "x86_64" -> "x86-64"
		ARCH := x86-64
	endif
	
	ifeq ($(ARCH),armv6l) # "armv6l" -> "arm"
		ARCH := arm
		SUBARCH := armv6
	endif

	ifeq ($(ARCH),armv7l) # "armv7l" -> "arm
		ARCH := arm
		SUBARCH := armv7
	endif
	
endif