Linux static/dynamic lib

最新推荐文章于 2021-09-23 11:21:27 发布

zrlean

最新推荐文章于 2021-09-23 11:21:27 发布

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分类专栏： linux

本文链接：https://blog.youkuaiyun.com/zrlean/article/details/28235507

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#include "hello.h"
//main.c
#include "hi.h"
int main()
{
        hello("Lean");
        hi("tom");
        return 0;
}

//hello.h
#ifndef HELLO_H
#define HELLO_H
void hello(const char* name);
#endif

//hello.c
#include <stdio.h>
void hello(const char * name)
{
        printf("Hello %s!\n", name);
}

//hi.h
#ifndef HI_H
#define HI_H
void hi(const char* name);
#endif

#include <stdio.h>
//hi.c
void hi(const char * name)
{
        printf("Hi %s!\n", name);
}

[xxxhost]$gcc -c hello.c hi.c
[xxxhost]$ls *.o
hello.o  hi.o
[xxxhost]$ar -rcs libhi.a hi.o
[xxxhost]$ls *.a
libhi.a
[xxxhost]$gcc -shared -fPIC -o libhello.so hello.o
/usr/bin/ld: hello.o: relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC
hello.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
[xxxhost]$gcc -fPIC -c hello.c
[xxxhost]$ls *.o
hello.o  hi.o
[xxxhost]$gcc -shared -fPIC -o libhello.so hello.o
[xxxhost]$ls *.so
libhello.so
[xxxhost]$gcc -o hello main.c -L. -lhello -lhi
[xxxhost]$./hello
./hello: error while loading shared libraries: libhello.so: cannot open shared object file: No such file or directory
[xxxhost]$
[xxxhost]$export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./
[xxxhost]$./hello
Hello Lean!
Hi tom!