揭开Makefile的神秘面纱

!if 0

!endif

!if 0

Use of this sample source code is subject to the terms of the Microsoft

license agreement under which you licensed this sample source code. If

you did not accept the terms of the license agreement, you are not

authorized to use this sample source code. For the terms of the license,

please see the license agreement between you and Microsoft or, if applicable,

see the LICENSE.RTF on your install media or the root of your tools installation.

THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES OR INDEMNITIES.

!endif

!if 0

Use of this source code is subject to the terms of the Microsoft end-user

license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.

If you did not accept the terms of the EULA, you are not authorized to use

this source code. For a copy of the EULA, please see the LICENSE.RTF on your

install media.

!endif

SYNCHRONIZE_DRAIN=1

TARGETNAME=NULLCAM

TARGETTYPE=LIBRARY

TARGETDEFNAME=$(TARGETNAME)

DEFFILE=$(TARGETDEFNAME).def

WINCETARGETFILE0=$(_RELEASELIBDIR)$(DEFFILE)

TARGETLIBS=

$(_COMMONSDKROOT)lib$(_CPUINDPATH)coredll.lib

INCLUDES=$(INCLUDES)

$(_PUBLICROOT)directxsdkinc

SOURCES=

CameraDevice.cpp

CameraDriver.cpp

PinDevice.cpp

PinDriver.cpp

PinHardware.cpp

总体而言，sources文件包含了一些用户的宏定义，这些宏定义会被Makefile和Nmake使用，来编译项目的源代码。我们知道，Nmake程序要通过使用Makefile来知道如何对源代码进行编译，如果对于每个目录、每个项目，都要写自己的Makefile，虽然灵活性很高但是工作量非常大。有没有一种简单的方法来使用makefile呢？比较简单的办法是可把一些makefile中对所有项目都通用的部分提取出来，对某个特定项目，只需把不同的内容添加进来，这样就简化了对makefile的使用。sources文件就是出于此种目的而诞生的。

下图展示了makefile与sources之间的关系。