Hi!!
I'm new to the list, but I searched archives looking for a solution and
found nothing.
I have TWO questions, but it's the same problem.
First is -rdynamic swich for gcc. it's used to export symbols for shared
objects and the second is about linking shared objects (.dll) with symbols
declared as external.
Let's see following code:
---main.c---
#include <dlfcn.h>
#include <stdio.h>
int c;
main () {
int (*foo)();
void *handler = dlopen ("./foo.so", RTLD_LAZY|RTLD_GLOBAL);
if (!handler) {
fputs (dlerror(), stderr);
printf("\n");
exit(1);
}
foo = dlsym(handler,"foo");
(*foo)();
dlclose(handler);
}
---main.c---
and following shared object source:
---foo.c---
//extern int c;
foo () {
printf("Fooo!\n");
// printf("c=%i\n",c);
}
---foo.c---
If I compile it under Unix or windows (under Win using attached shell
script -- refering to the documentation) everything is OK. But WHAT I have
to do to get it working with foo looking like this:
---foo.c---
extern int c;
foo () {
printf("Fooo!\n");
printf("c=%i\n",c);
}
---foo.c---
Under Unix I used to compile main:
gcc main.c -o main -ldl -rdynamic
(to export symbols to dynamically dlopened shared objects), and foo:
gcc -shared foo.c -o foo.so
First of all -rdynamic does not work under cygwin and moreover ld fails
linking shared objects with symbols declared as external.
Any suggestions???
Regards,
--
Mariusz Wołoszyn
Internet Security Specialist, Internet Partners
ll.sh
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