Makerules

#
# Makerules
#
# Pays attention to the following variables:
#  DEBUG = y      - debugging compiler flags
#  UNAME = xxxxx  - cross-compile for the given platform
#                   (In particular, you can say UNAME = Win32 if mingw
#		     is installed to cross-compile for Windows, or
#		     UNAME = Linux to get 32-bit binaries on Linux x64)
#                   If UNAME undefined on input, gets defined here.
#  DESTDIR = xxxx - Place to put output binaries.
#  MAKERULESDIR   - Where to find Makerules and Makedefs
#
#
# Defines the following variables:
#  UNAME          - destination system type (if not set by user)
#  OBJDIR         - directory for object files
#  CC             - C compiler
#  CXX            - C++ compiler
#  CFLAGS         - C compiler flags
#  CXXFLAGS       - C++ compiler flags
#  LDFLAGS        - Linker flags
#  LIBS           - Libraries
#  GLLIBS         - OpenGL libraries
#  EXE            - Extension of executables (.exe under Win32)
#  LINK           - The entire linking process
#  STATICLIB      - Create .a archive
#  SHAREDLIB      - Create .so archive
#
#
# Client Makefiles need to define a "default:" rule
# - SMR
#

#
# Define UNAME
#
ifdef windir
	UNAME := Win32
else
	UNAME := $(shell uname)
	UNAME := $(patsubst CYGWIN%,Win32,$(UNAME))
	UNAME := $(patsubst MINGW%,Win32,$(UNAME))

	ifeq ($(UNAME),Linux)
		ARCH := $(shell uname -m)
		ifeq ($(ARCH),x86_64)
			UNAME := Linux64
		endif
		ifeq ($(ARCH),aarch64)
			UNAME := Linux64
		endif
	endif
	ifeq ($(UNAME),Darwin)
		IS64 := $(shell sysctl -n hw.cpu64bit_capable)
		ifeq ($(IS64),1)
			UNAME := Darwin64
		endif
	endif
endif

#
# Other variable definitions
#
OBJDIR ?= OBJ.$(UNAME)
DESTDIR ?= .
ifndef MAKERULESDIR
	MAKERULESDIR := $(subst /,,$(dir $(lastword $(MAKEFILE_LIST))))
endif

#
# Rules
#
all: $(OBJDIR) $(DESTDIR) default

$(OBJDIR) $(DESTDIR):
	-mkdir $@

debug:
	$(MAKE) DEBUG=y

win32:
	$(MAKE) UNAME=Win32

linux32:
	$(MAKE) UNAME=Linux

linux64:
	$(MAKE) UNAME=Linux64

darwin32:
	$(MAKE) UNAME=Darwin

darwin64:
	$(MAKE) UNAME=Darwin64

.PHONY: all default clean debug win32 linux32 linux64 darwin32 darwin64

#
# Makedefs
#
include $(MAKERULESDIR)/Makedefs.$(UNAME)