makefile源码分析

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1、#(C)Copyright（版权）2000-2006#WolfgangDenk（人名）,DENXSoftwareEngineering（denx软件工程师）,wd@denx.de.（邮箱）#SeefileCREDITSforlistofpeoplewhocontributedtothisproject.#在文件中查看对项目有贡献的人人的名单#Thisprogramisfreesoftware;youcanredistribute(重新分配)itand/ormodify（修改）itundertheterm

2、s（条款）oftheGNUGeneral（通用的）PublicLicense（许可）aspublished（已出版的）bytheFreeSoftwareFoundatio（基金会）;eitherversion（版本）2oftheLicense,or(atyouroption)anylaterversion.##Thisprogramisdistributedinthehopethatitwillbeuseful,#butWITHOUTANYWARRANTY（保证）;withouteventheimpli

3、ed（暗示、默认）warrantyof#MERCHANTABILITYorFITNESSFORAPARTICULARPURPOSE.（merchantability（商业性的）orfitnessforaparticular（特别）poupose）SeetheGNUGeneralPublicLicenseformoredetails.##YoushouldhavereceivedacopyoftheGNUGeneralPublicLicense#alongwiththisprogram;ifnot,wri

4、tetotheFreeSoftwareFoundation（自由软件基金会）,Inc.,59TemplePlace,Suite330,Boston,#MA02111-1307USA#//上面的是版本信息VERSION=1PATCHLEVEL=1SUBLEVEL=6EXTRAVERSION=U_BOOT_VERSION=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)//VERSION_FILE=$(obj)include/version_autoge

5、nerated.hHOSTARCH:=$(shelluname-m

6、sed-es/i.86/i386/-es/sun4u/sparc64/-es/arm.*/arm/-es/sa110/arm/-es/powerpc/ppc/-es/macppc/ppc/)HOSTOS:=$(shelluname-s

7、tr'[:upper:]''[:lower:]'

8、sed-e's/(cygwin).*/cygwin/')exportHOSTARCHHOSTOS#Dealwithcollidingde

9、finitionsfromtcshetc.VENDOR=###########################################################################U-bootbuildsupportsproducingaobjectfilestotheseparateexternal#directory.Twousecasesaresupported:##1)AddO=tothemakecommandline#'makeO=/tmp/buildall'##2)

10、SetenvironementvariableBUILD_DIRtopointtothedesiredlocation#'exportBUILD_DIR=/tmp/build'#'make'##ThesecondapproachcanalsobeusedwithaMAKEALLscript#'exportBUILD_DIR=/tmp/build'#'./MAKEALL'##Commandline'O='settingoverridesBUILD_DIRenvironentvariable.##Whenn

11、oneoftheabovemethodsisusedthelocalbuildisperformedand#theobjectfilesareplacedinthesourcedirectory.#ifdefOifeq("$(originO)","commandline")BUILD_DIR:=$(O)endifendififneq($(BUILD_DIR),)saved-output:=$(BUILD_DIR)#Attempttocrea