u-boot中的include/autoconf.mk文件是如何生成的

在Makefile中：

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1. $(obj)include/autoconf.mk: $(obj)include/config.h  
2.   @$(XECHO) Generating $@ ; /  
3.   set -e ; /  
4.   : Extract the config macros ; /  
5.   $(CPP) $(CFLAGS) -DDO_DEPS_ONLY -dM include/common.h | /  
6.     sed -n -f tools/scripts/define2mk.sed > $@ 
   

在2011-12中：

#
# Auto-generate the autoconf.mk file (which is included by all makefiles)
#
# This target actually generates 2 files; autoconf.mk and autoconf.mk.dep.
# the dep file is only include in this top level makefile to determine when
# to regenerate the autoconf.mk file.
$(obj)include/autoconf.mk.dep: $(obj)include/config.h include/common.h
	@$(XECHO) Generating $@ ; \
	set -e ; \
	: Generate the dependancies ; \
	$(CC) -x c -DDO_DEPS_ONLY -M $(CFLAGS) $(CPPFLAGS) \
		-MQ $(obj)include/autoconf.mk include/common.h > $@

$(obj)include/autoconf.mk: $(obj)include/config.h
	@$(XECHO) Generating $@ ; \
	set -e ; \
	: Extract the config macros ; \
	$(CPP) $(CFLAGS) -DDO_DEPS_ONLY -dM include/common.h | \
		sed -n -f tools/scripts/define2mk.sed > $@.tmp && \
	mv $@.tmp $@

实际执行的命令：

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1. arm-none-linux-gnueabi-gcc -E -g -Os -fno-strict-aliasing -fno-common -ffixed-r8 -msoft-float -D__KERNEL__ -DTEXT_BASE=0xc3e00000 -I/home/zkl/svn/compiled/uboot-1.3.4-m9_v4/include -fno-builtin -ffreestanding -nostdinc -isystem /usr/local/arm/arm-2009q3/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/include -pipe -DCONFIG_ARM -D__ARM__ -march=armv5te -mabi=apcs-gnu -mno-thumb-interwork -Wall -Wstrict-prototypes -fno-stack-protector -DDO_DEPS_ONLY -dM include/common.h | sed -n -f tools/scripts/define2mk.sed  

 

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1. /^#define CONFIG_[A-Za-z0-9_][A-Za-z0-9_]*/ {  
2.   # Strip the #define prefix  
3.   s/#define *//;                
4.   # Change to form CONFIG_*=VALUE  
5.   s/  */=/;  
6.   # Drop trailing spaces        
7.   s/ *$//;  
8.   # drop quotes around string values  
9.   s/="/(.*/)"$/=/1/;            
10.   # Concatenate string values   
11.   s/" *"//g;  
12.   # Wrap non-numeral values with quotes  
13.   s/=/(.*/?[^0-9].*/)$/=/"/1/"/;   
14.   # Change '1' and empty values to "y" (not perfect, but  
15.   # supports conditional compilation in the makefiles  
16.   s/=$/=y/;  
17.   s/=1$/=y/;  
18.   # print the line              
19.   p                             
20. }