Re: Undefined symbols in 2.6.11-rc5-mm1

[Rusty Russell <rusty@rustcorp.com.au>]

On Wed, 2005-03-02 at 12:23 -0500, Valdis.Kletnieks@vt.edu wrote:
> static int __init init_hermes(void)
> {
>         return 0;
> }
> 
> static void __exit exit_hermes(void)
> {
> }
> 
> module_init(init_hermes);
> module_exit(exit_hermes);
> 
> That's it.  As far as I can tell, gcc 4.0 semi-correctly determined they were both
> static functions with no side effect, threw them away, and then the module_init
> and module_exit threw undefined symbols for them.

As a module, we create a non-static alias for "init_hermes", called
"init_module", effectively making it non-static.  GCC should not
eliminate it in this case.  Similar with module_exit().

For non-modules, we have __attribute_used__.

Rusty.
-- 
A bad analogy is like a leaky screwdriver -- Richard Braakman