How to link a static lib when build a shared lib ?

How to link a static lib when build a shared lib ?

[Andy]

Hi all,
I got that, glibc can support SHA in crypt lib since v2.7.

There is a requirement in my application to use SHA, but update the
whole glibc is too risky. So I want to build a specific crypt lib for
the module using crypt function in my application.

Now the calling graph seems like this, from a simple view.

crypt_user.c  ---->  call crypt() function in libcrypt.so

myutil.c  -----> call functions in crypt_user.c, and it will be build
to a shared lib, libmyutil.so

Executable program : server -----> need to use libmyutil.so to work.

Now I can ONLY use the latest static lib  libcrypt.a from the new
glibc. How should I use it ？ Link it when build libmyutil.so or build
server ?

I tried to update my Makefile to link the libcrypt.a, but seems that
the called crypt function is not as I expected, it's still from the old glibc.

Could anybody give me a help with how to use the gcc option and write
a working Makefile ?

Any reply will be appreciated!

Thanks,

Re: How to link a static lib when build a shared lib ?

[Ian Lance Taylor]

Andy <hewanxiang@gmail.com> writes:

> I got that, glibc can support SHA in crypt lib since v2.7.
>
> There is a requirement in my application to use SHA, but update the
> whole glibc is too risky. So I want to build a specific crypt lib for
> the module using crypt function in my application.
>
> Now the calling graph seems like this, from a simple view.
>
> crypt_user.c  ---->  call crypt() function in libcrypt.so
>
> myutil.c  -----> call functions in crypt_user.c, and it will be build
> to a shared lib, libmyutil.so
>
> Executable program : server -----> need to use libmyutil.so to work.
>
> Now I can ONLY use the latest static lib  libcrypt.a from the new
> glibc. How should I use it ？ Link it when build libmyutil.so or build
> server ?
>
> I tried to update my Makefile to link the libcrypt.a, but seems that
> the called crypt function is not as I expected, it's still from the old glibc.
>
> Could anybody give me a help with how to use the gcc option and write
> a working Makefile ?

This is the wrong mailing list.  gcc@gcc.gnu.org is for discussion by
gcc developers.  You can try gcc-help@gcc.gnu.org.

What you are trying to do is not supported.  I would recommend simply
finding source code for the SHA function--you should be able to find it
on the web--and using that.

Ian