help on building shared object - 未名空间MITBBS历史存档

国际科技财经博客移民网络热点娱乐民生时事公众号

Redian新闻

>未名空间

>Unix - 噫吁兮，危乎高哉

help on building shared object

help on building shared object# Unix - 噫吁兮，危乎高哉

i*o2001-02-09 08:02

1 楼

To build a shared object( .so file),I used following commond:
gcc -fPIC -shared -o output.so input.c
and foo( ) is a function defined in input.c
In order to call foo, I did following in calling process:
void * handle = dlopen("output.so",RTLD_LAZY);
if((error=dlerror())!=NULL){
fputs(error,stderr);
exit(1);
}
foo = dlsym(handle,"foo");
foo()...
However, I got result:
./output.so: undefined symbol: foo
I am pretty sure the problem is from the shared object output.so which was not

m*m2001-02-09 08:02

2 楼

Maybe you want to use gnu libtool.

【在 i*o 的大作中提到】

: To build a shared object( .so file),I used following commond:
: gcc -fPIC -shared -o output.so input.c
: and foo( ) is a function defined in input.c
: In order to call foo, I did following in calling process:
: void * handle = dlopen("output.so",RTLD_LAZY);
: if((error=dlerror())!=NULL){
: fputs(error,stderr);
: exit(1);
: }
: foo = dlsym(handle,"foo");

T*r2001-02-09 08:02

3 楼

try this way:
gcc -fPIC -shared -o output.so input.c -ldl -lc

【在 i*o 的大作中提到】

i*o2001-02-09 08:02

4 楼

Using command strings output.so, I found the function void foo(void) is
foo_Fv in the shared object.
Thus, we need call
foo = dlsym(handle,"foo_Fv"); instead of
By the way, I am using Redhat 6.2, I don't know why gcc

【在 T********r 的大作中提到】

: try this way:
: gcc -fPIC -shared -o output.so input.c -ldl -lc