Enable easy swithing between Box2D and chipmunk in linux and nacl

The ENABLE_BOX2D/ENABLE_CHIPMUNK defines were previously
hardcoded in the Makefiles.  Now you get chipmunk by default
on both platforms and can enble Box2D by setting USE_BOX2D in
your environment.

Also remove erroneous -D__CC_PLATFORM_FILEUTILS_CPP__ and
-D__CC_PLATFORM_IMAGE_CPP__ from linux Makefiles.  These should
never be defined globally like this.

cocos2dx/proj.linux/Makefile

@@ -9,9 +9,6 @@ INCLUDES += \
 			-I../../external/chipmunk/include/chipmunk \
 			-I../../extensions/network \
 
-DEFINES += -D__CC_PLATFORM_FILEUTILS_CPP__
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
-
 SOURCES = ../actions/CCAction.cpp \
 ../actions/CCActionCamera.cpp \
 ../actions/CCActionEase.cpp \

cocos2dx/proj.linux/cocos2dx.mk

@@ -8,6 +8,12 @@ ARFLAGS = cr
 
 DEFINES += -DLINUX
 
+ifdef USE_BOX2D
+DEFINES += -DCC_ENABLE_BOX2D_INTEGRATION
+else
+DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
+endif
+
 THIS_MAKEFILE := $(CURDIR)/$(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
 ifndef COCOS_ROOT
 COCOS_ROOT := $(realpath $(dir $(THIS_MAKEFILE))/../..)

cocos2dx/proj.nacl/Makefile

@@ -137,8 +137,6 @@ CXXFLAGS += -Wno-sequence-point
 
 TARGET = $(LIB_DIR)/libcocos2d.a
 
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
-
 all: $(TARGET)
 
 $(TARGET): $(OBJECTS) $(CORE_MAKEFILE_LIST)

cocos2dx/proj.nacl/cocos2dx.mk

@@ -18,13 +18,15 @@ THIS_MAKEFILE := $(CURDIR)/$(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
 # The top level of the cocos2dx-x source tree.  The parent Makefile will
 # often define this, but in case is doesn't we can find it relative to
 # THIS_MAKEFILE
-COCOS_ROOT ?= $(realpath $(dir $(THIS_MAKEFILE))/../..)
-COCOS_SRC = $(COCOS_ROOT)/cocos2dx
+ifndef COCOS_ROOT
+COCOS_ROOT := $(realpath $(dir $(THIS_MAKEFILE))/../..)
+endif
+COCOS_SRC := $(COCOS_ROOT)/cocos2dx
 
 ifeq ($(NACL_ARCH), i686)
-ARCH_DIR=$(NACL_LIBC)_x86_32
+ARCH_DIR := $(NACL_LIBC)_x86_32
 else
-ARCH_DIR=$(NACL_LIBC)_$(NACL_ARCH)
+ARCH_DIR := $(NACL_LIBC)_$(NACL_ARCH)
 endif
 
 NACLPORTS_ROOT ?= $(NACL_SDK_ROOT)/ports
@@ -33,6 +35,12 @@ OUT_DIR ?= obj
 OBJ_DIR ?= $(OUT_DIR)/$(NACL_ARCH)
 LIB_DIR ?= $(COCOS_ROOT)/lib/nacl/$(ARCH_DIR)
 
+ifdef USE_BOX2D
+DEFINES += -DCC_ENABLE_BOX2D_INTEGRATION
+else
+DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
+endif
+
 INCLUDES += -I$(COCOS_SRC) \
 	-I$(COCOS_SRC)/cocoa \
 	-I$(COCOS_SRC)/include \

extensions/cocos-ext.h

@@ -42,16 +42,9 @@
 #include "network/HttpClient.h"
 
 // Physics integration
-#if CC_ENABLE_CHIPMUNK_INTEGRATION
+#if CC_ENABLE_CHIPMUNK_INTEGRATION || CC_ENABLE_BOX2D_INTEGRATION
 #include "physics_nodes/CCPhysicsDebugNode.h"
 #include "physics_nodes/CCPhysicsSprite.h"
 #endif
 
-#if CC_ENABLE_BOX2D_INTEGRATION
-#include "physics_nodes/CCPhysicsDebugNode.h"
-#include "physics_nodes/CCPhysicsSprite.h"
-#endif
-
-
 #endif /* __COCOS2D_EXT_H__ */
-

extensions/proj.linux/Makefile

@@ -10,9 +10,6 @@ INCLUDES = -I$(COCOS_ROOT)/external \
 	-I../GUI/CCControlExtension \
 	-I../network
 
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1
-DEFINES += -D__CC_PLATFORM_IMAGE_CPP__
-
 SOURCES = ../CCBReader/CCBFileLoader.cpp \
 ../CCBReader/CCMenuItemImageLoader.cpp \
 ../CCBReader/CCBReader.cpp \

samples/Cpp/TestCpp/proj.linux/Makefile

@@ -110,8 +110,6 @@ STATICLIBS += \
     $(LIB_DIR)/libbox2d.a \
     $(LIB_DIR)/libchipmunk.a
 
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1
-
 ####### Build rules
 $(TARGET): $(OBJECTS) $(STATICLIBS) $(COCOS_LIBS) $(CORE_MAKEFILE_LIST)
 	@mkdir -p $(@D)

samples/Cpp/TestCpp/proj.nacl/Makefile

@@ -1,5 +1,3 @@
-DEFINES += -DCC_ENABLE_BOX2D_INTEGRATION
-
 COCOS_ROOT = ../../../..
 COCOS2DX_PATH = $(COCOS_ROOT)/cocos2dx