[Author: Bo Shen <voice.shen@gmail.com>
[u-boot: 2014.01-rc1]
u-boot的Makefile中包括以下几个清除命令：unconfig, clean, tidy, clobber, mrproper, distclean。另外，涉及一个backup命令。
下面具体分析每一个清除所做的工作。
1. unconfig
766 unconfig:
767 @rm -f $(obj)include/config.h $(obj)include/config.mk \
768 $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp \
769 $(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep \
770 $(obj)include/spl-autoconf.mk \
771 $(obj)include/tpl-autoconf.mk
unconfig就是对一些自动生成的文件进行删除。
2. clean
783 clean:
784 @rm -f $(obj)examples/standalone/82559_eeprom \
785 $(obj)examples/standalone/atmel_df_pow2 \
786 $(obj)examples/standalone/eepro100_eeprom \
787 $(obj)examples/standalone/hello_world \
788 $(obj)examples/standalone/interrupt \
789 $(obj)examples/standalone/mem_to_mem_idma2intr \
790 $(obj)examples/standalone/sched \
791 $(obj)examples/standalone/smc911{11,x}_eeprom \
792 $(obj)examples/standalone/test_burst \
793 $(obj)examples/standalone/timer
794 @rm -f $(obj)examples/api/demo{,.bin}
795 @rm -f $(obj)tools/bmp_logo $(obj)tools/easylogo/easylogo \
796 $(obj)tools/env/{fw_printenv,fw_setenv} \
797 $(obj)tools/envcrc \
798 $(obj)tools/gdb/{astest,gdbcont,gdbsend} \
799 $(obj)tools/gen_eth_addr $(obj)tools/img2srec \
800 $(obj)tools/mk{env,}image $(obj)tools/mpc86x_clk \
801 $(obj)tools/mk{$(BOARD),}spl \
802 $(obj)tools/mxsboot \
803 $(obj)tools/ncb $(obj)tools/ubsha1 \
804 $(obj)tools/kernel-doc/docproc \
805 $(obj)tools/proftool
806 @rm -f $(obj)board/cray/L1/{bootscript.c,bootscript.image} \
807 $(obj)board/matrix_vision/*/bootscript.img \
808 $(obj)board/voiceblue/eeprom \
809 $(obj)u-boot.lds \
810 $(obj)arch/blackfin/cpu/init.{lds,elf}
811 @rm -f $(obj)include/bmp_logo.h
812 @rm -f $(obj)include/bmp_logo_data.h
813 @rm -f $(obj)lib/asm-offsets.s
814 @rm -f $(obj)include/generated/asm-offsets.h
815 @rm -f $(obj)$(CPUDIR)/$(SOC)/asm-offsets.s
816 @rm -f $(TIMESTAMP_FILE) $(VERSION_FILE)
817 @$(MAKE) -s -C doc/DocBook/ cleandocs
818 @find $(OBJTREE) -type f \
819 \( -name 'core' -o -name '*.bak' -o -name '*~' -o -name '*.su' \
820 -o -name '*.o' -o -name '*.a' -o -name '*.exe' \
821 -o -name '*.cfgtmp' \) -print \
822 | xargs rm -f
818~822: The find "-print"参数：man find后可查找到对此的解释如下：
—>8—
print the full file name on the standard output, followed by a newline. If you are piping the output of find into another program and there is the faintest possibility that the files which you are searching for might contain a newline, then you should seriously consider using the "-print0" option instead of "-print".
—8<—
3. tidy
825 tidy: clean
826 find $(OBJTREE) -type f \( -name '*.depend*' \) -print | xargs rm -f
tidy在clean的基础上，对depend文件进行删除。
4. clobber
828 clobber: tidy
829 @find $(OBJTREE) -type f \( -name '*.srec' \
830 -o -name '*.bin' -o -name u-boot.img \) \
831 -print0 | xargs -0 rm -f
832 @rm -f $(OBJS) $(obj)*.bak $(obj)ctags $(obj)etags $(obj)TAGS \
833 $(obj)cscope.* $(obj)*.*~
834 @rm -f $(obj)u-boot $(obj)u-boot.map $(obj)u-boot.hex $(ALL-y)
835 @rm -f $(obj)u-boot.kwb
836 @rm -f $(obj)u-boot.pbl
837 @rm -f $(obj)u-boot.imx
838 @rm -f $(obj)u-boot-with-spl.imx
839 @rm -f $(obj)u-boot-with-nand-spl.imx
840 @rm -f $(obj)u-boot.ubl
841 @rm -f $(obj)u-boot.ais
842 @rm -f $(obj)u-boot.dtb
843 @rm -f $(obj)u-boot.sb
844 @rm -f $(obj)u-boot.bd
845 @rm -f $(obj)u-boot.spr
846 @rm -f $(obj)nand_spl/{u-boot.{lds,lst},System.map}
847 @rm -f $(obj)nand_spl/{u-boot-nand_spl.lds,u-boot-spl,u-boot-spl.map}
848 @rm -f $(obj)spl/{u-boot-spl,u-boot-spl.bin,u-boot-spl.map}
849 @rm -f $(obj)spl/u-boot-spl.lds
850 @rm -f $(obj)tpl/{u-boot-tpl,u-boot-tpl.bin,u-boot-tpl.map}
851 @rm -f $(obj)tpl/u-boot-spl.lds
852 @rm -f $(obj)MLO MLO.byteswap
853 @rm -f $(obj)SPL
854 @rm -f $(obj)tools/xway-swap-bytes
855 @rm -fr $(obj)include/asm/proc $(obj)include/asm/arch $(obj)include/asm
856 @rm -fr $(obj)include/generated
857 @[ ! -d $(obj)nand_spl ] || find $(obj)nand_spl -name "*" -type l -print | xargs rm -f
858 @rm -f $(obj)dts/*.tmp
859 @rm -f $(obj)spl/u-boot-spl{,-pad}.ais
clobber在tidy的基础上更进一步的进行删除操作。
829~831: The find "-print0"参数：man find后可查找到对此的解释如下：
—>8—
print the full file name on the standard output, followed by a null character (instead of the newline character that "-print" uses). This allows file names that contain newlines or other types of white space to be correctly interpreted by programs that process the find output. This option corresponds to the -0 option of xargs.
—8<—
5. mrproper/distclean
861 mrproper \
862 distclean: clobber unconfig
863 ifneq ($(OBJTREE),$(SRCTREE))
864 rm -rf $(obj)*
865 endif
mrproper与distclean进行的操作是一样的。在clobber与unconfig的基础上，看是否需要将obj目录删除。
6. backup.
867 backup:
868 F=`basename $(TOPDIR)` ; cd .. ; \
869 gtar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F
将源代码打成一个gzip的tar包。
gtar命令可能没有：workaround –> ln -s /bin/tar /bin/gtar
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