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Thanks for your suggestion. It works perfectly!

Just wonder: It seems gcc manual also specifies pragma weak
(http://gcc.gnu.org/onlinedocs/gcc/Weak-Pragmas.html) But, it seems
that "#pragma weak special_subroutine_1 = special_subroutine" can't
create a weak alias. can you explain why it does not work?

Please take a look:
#cat mylibrary.c
//====================
// file: mylibrary.c
#pragma weak special_subroutine_1 = special_subroutine
#pragma weak special_subroutine_1 = special_subroutine
int special_subroutine(){
     int i =0;
     return i;
}
//====================
#gcc -c mylibrary.c
#nm mylibrary.o
00000000 T special_subroutine

PS: By contract, your suggestion works!
#cat mylibrary.c
//====================
// file: mylibrary.c
int special_subroutine_1 () __attribute__ ((weak, alias
("special_subroutine")));
int special_subroutine_2 () __attribute__ ((weak, alias
("special_subroutine")));
int special_subroutine(){
     int i =0;
     return i;
}
//====================
#gcc -c mylibrary.c
#nm mylibrary.o
00000000 T special_subroutine
00000000 W special_subroutine_1
00000000 W special_subroutine_2
Roger Leigh wrote:
> On 2006-07-12, Keith Thompson <kst-u@mib.org> wrote:
> > "seyong_choi@hotmail.com" <seyong_choi@hotmail.com> writes:
> >> I want to use alias to call a defined function (special_subroutine in
> >> this example) using different names (special_subroutine_1 and
> >> special_subroutine_2 in this example), is it doable? --I tried the
> >> following way, and it did not work when I tried to  compile it with
> >> gcc. I guess weak_alias is only valid for glibc, or maybe the way I use
> >> it was wrong.
> >>
> >> Can someone give me a suggestion?
> >
> > There is nothing called "weak_alias" or "strong_alias" in standard C.
>
> It's a feature specific to ELF platforms.  GCC lets you define
> such functions using function attributes.
>
> The GCC manual shows exactly how to do this:
> info gcc 'C Extensions' 'Function Attributes'
>
>
> Regards,
> Roger
>
> --
>   .''`.  Roger Leigh
>  : :' :  Debian GNU/Linux             http://people.debian.org/~rleigh/
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