Symbol Hiding

[newbei]

Hello all,

I am trying symbol hiding in GCC version 4.1, but it seems like i am
not doing something right .

Please find here in my example

/* libhello.c*/
int sizeOfLong()
{
return sizeof(long);
}

void hello(void) {

printf("size of a short is %d\n", sizeOfInt());
printf("Hello, library world.\n");

}

/* libhello.h - demonstrate library use. */
#define EXPORT __attribute__((visibility("default")))
EXPORT void hello(void);
int sizeOfInt();

now i compile using the following commands:

gcc -fPIC -fvisibility=hidden -Wall -g -c libhello.c
gcc -g -shared -Wl,-soname,libhello.so.0 \
-o libhello.so.0.0 libhello.o -lc

do nm libhello.so

I find both functions hello and sizeOfInt() in it why?

Question 2:

What is the difference between strip and symbol hiding.

Thanks

Newbei

[cyberinstru]

Use -s option to hide symbols.

gcc -s -g -shared -Wl,-soname,libhello.so.0 -o libhello.so.0.0 libhello.o -lc