linux strip
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strip经常用来去除目标文件中的一些符号表、调试符号表信息,以减小程序的大小,在rpmbuild包的最后就用到。
其支持的选项如下:
>strip -h
用法:strip <选项> 输入文件
从文件中删除符号和节
选项为:
-I --input-target=<bfdname> Assume input file is in format <bfdname>
-O --output-target=<bfdname> Create an output file in format <bfdname>
-F --target=<bfdname> Set both input and output format to <bfdname>
-p --preserve-dates Copy modified/access timestamps to the output
-R --remove-section=<name> Remove section <name> from the output
-s --strip-all Remove all symbol and relocation information
-g -S -d --strip-debug Remove all debugging symbols & sections
--strip-unneeded Remove all symbols not needed by relocations
--only-keep-debug Strip everything but the debug information
-N --strip-symbol=<name> Do not copy symbol <name>
-K --keep-symbol=<name> Do not strip symbol <name>
--keep-file-symbols Do not strip file symbol(s)
-w --wildcard Permit wildcard in symbol comparison
-x --discard-all Remove all non-global symbols
-X --discard-locals Remove any compiler-generated symbols
-v --verbose List all object files modified
-V --version Display this program's version number
-h --help Display this output
--info List object formats & architectures supported
-o <file> Place stripped output into <file>
strip: 支持的目标: elf32-i386 a.out-i386-linux efi-app-ia32 elf32-little elf32-big elf64-alpha ecoff-littlealpha elf64-little elf64-big elf32-littlearm elf32-bigarm elf32-hppa-linux elf32-hppa elf64-ia64-little elf64-ia64-big efi-app-ia64 elf32-m68k a.out-m68k-linux elf32-powerpc aixcoff-rs6000 elf32-powerpcle ppcboot elf64-powerpc elf64-powerpcle aixcoff64-rs6000 elf32-s390 elf64-s390 elf32-sparc a.out-sparc-linux elf64-sparc a.out-sunos-big elf64-x86-64 pe-i386 pei-i386 srec symbolsrec tekhex binary ihex trad-core
目标文件分为:可重定位文件、可执行文件、共享文件
strip的默认选项会去除.symbol节的内容以及.debug节的内容,因此尽量只对可执行文件执行strip而不要对静态库或动态库等目标文件strip。
测试代码如下:
int max(int val1, int val2)
{
int iVal = (val1 > val2) ? val1 : val2;
return iVal;
}
int min(int val1, int val2)
{
int iVal = (val1 < val2) ? val1 : val2;
return iVal;
}
#include <stdio.h>
extern int max(int val1, int val2);
extern int min(int val1, int val2);
int main()
{
int val1, val2;
scanf("%d %d", &val1, &val2);
printf("%d\n", max(val1, val2));
printf("%d\n", min(val1, val2));
}
>gcc -c max.c min.c
>ar rcs libcmp.a max.o min.o
>gcc -o test main.c libcmp.a
>gcc -share -fPIC -o libcmp.so max.c min.c
>cp libcmp.a libcmp.a.bak
>cp libcmp.so libcmp.so.bak
>cp test test.orig
>strip libcmp.a libcmp.so
>strip test
>ll -h
总计 92K
-rwxr-xr-x 1 6.9K a.out
-rw-r--r-- 1 1.1K libcmp.a
-rw-r--r-- 1 1.6K libcmp.a.bak
-rwxr-xr-x 1 2.9K libcmp.so
-rwxr-xr-x 1 5.3K libcmp.so.bak
-rw-r--r-- 1 237 main.c
-rw-r--r-- 1 89 max.c
-rw-r--r-- 1 695 max.o
-rw-r--r-- 1 89 min.c
-rw-r--r-- 1 695 min.o
-rwxr-xr-x 1 3.2K test
-rwxr-xr-x 1 6.8K test.orig
选项简释:
The -fPIC flag directs the compiler to generate position independent code section).
The -shared flag directs the linker to create a shared object file.
可见无论是静态库(libcmp.a)还是动态库(libcmp.so)还是可执行文件(test),去掉一些符号信息后都减小了很多,
但如果这时再链接这两个库的话是编不过的,因此,如果不是指定特殊的strip选项的话,还是尽量不要对库文件strip,
只对链接后的可执行文件strip就可以了(如果也不调试)。
其支持的选项如下:
>strip -h
用法:strip <选项> 输入文件
从文件中删除符号和节
选项为:
-I --input-target=<bfdname> Assume input file is in format <bfdname>
-O --output-target=<bfdname> Create an output file in format <bfdname>
-F --target=<bfdname> Set both input and output format to <bfdname>
-p --preserve-dates Copy modified/access timestamps to the output
-R --remove-section=<name> Remove section <name> from the output
-s --strip-all Remove all symbol and relocation information
-g -S -d --strip-debug Remove all debugging symbols & sections
--strip-unneeded Remove all symbols not needed by relocations
--only-keep-debug Strip everything but the debug information
-N --strip-symbol=<name> Do not copy symbol <name>
-K --keep-symbol=<name> Do not strip symbol <name>
--keep-file-symbols Do not strip file symbol(s)
-w --wildcard Permit wildcard in symbol comparison
-x --discard-all Remove all non-global symbols
-X --discard-locals Remove any compiler-generated symbols
-v --verbose List all object files modified
-V --version Display this program's version number
-h --help Display this output
--info List object formats & architectures supported
-o <file> Place stripped output into <file>
strip: 支持的目标: elf32-i386 a.out-i386-linux efi-app-ia32 elf32-little elf32-big elf64-alpha ecoff-littlealpha elf64-little elf64-big elf32-littlearm elf32-bigarm elf32-hppa-linux elf32-hppa elf64-ia64-little elf64-ia64-big efi-app-ia64 elf32-m68k a.out-m68k-linux elf32-powerpc aixcoff-rs6000 elf32-powerpcle ppcboot elf64-powerpc elf64-powerpcle aixcoff64-rs6000 elf32-s390 elf64-s390 elf32-sparc a.out-sparc-linux elf64-sparc a.out-sunos-big elf64-x86-64 pe-i386 pei-i386 srec symbolsrec tekhex binary ihex trad-core
目标文件分为:可重定位文件、可执行文件、共享文件
strip的默认选项会去除.symbol节的内容以及.debug节的内容,因此尽量只对可执行文件执行strip而不要对静态库或动态库等目标文件strip。
测试代码如下:
int max(int val1, int val2)
{
int iVal = (val1 > val2) ? val1 : val2;
return iVal;
}
int min(int val1, int val2)
{
int iVal = (val1 < val2) ? val1 : val2;
return iVal;
}
#include <stdio.h>
extern int max(int val1, int val2);
extern int min(int val1, int val2);
int main()
{
int val1, val2;
scanf("%d %d", &val1, &val2);
printf("%d\n", max(val1, val2));
printf("%d\n", min(val1, val2));
}
>gcc -c max.c min.c
>ar rcs libcmp.a max.o min.o
>gcc -o test main.c libcmp.a
>gcc -share -fPIC -o libcmp.so max.c min.c
>cp libcmp.a libcmp.a.bak
>cp libcmp.so libcmp.so.bak
>cp test test.orig
>strip libcmp.a libcmp.so
>strip test
>ll -h
总计 92K
-rwxr-xr-x 1 6.9K a.out
-rw-r--r-- 1 1.1K libcmp.a
-rw-r--r-- 1 1.6K libcmp.a.bak
-rwxr-xr-x 1 2.9K libcmp.so
-rwxr-xr-x 1 5.3K libcmp.so.bak
-rw-r--r-- 1 237 main.c
-rw-r--r-- 1 89 max.c
-rw-r--r-- 1 695 max.o
-rw-r--r-- 1 89 min.c
-rw-r--r-- 1 695 min.o
-rwxr-xr-x 1 3.2K test
-rwxr-xr-x 1 6.8K test.orig
选项简释:
The -fPIC flag directs the compiler to generate position independent code section).
The -shared flag directs the linker to create a shared object file.
可见无论是静态库(libcmp.a)还是动态库(libcmp.so)还是可执行文件(test),去掉一些符号信息后都减小了很多,
但如果这时再链接这两个库的话是编不过的,因此,如果不是指定特殊的strip选项的话,还是尽量不要对库文件strip,
只对链接后的可执行文件strip就可以了(如果也不调试)。
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