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    SubjectRe: [module-init-tools] fix weak symbol handling
    On Fri, Jan 17, 2003 at 12:57:03PM +1100, Rusty Russell wrote:
    > > No. The semantics I need is if A references a weak symbol S
    > > and *no one* implements it, then S resolves to NULL.
    >
    > Sorry, I was unclear. I want to know the dependency semantics:
    >
    > If B exports S, should depmod believe A needs B, or not? Your patch
    > leaves that semantic (all it does is suppress the errors).

    Well, that depends on whether A defines S or not. If A does
    define S, then I don't care. I'd say "no", A does not depend
    on B. If A does not define S, then most definitely "yes", as
    with any other definition.

    > I'm not sure what semantics are "right", since I don't know what
    > you're trying to do, or what is wrong with get_symbol().

    I just told you. Quoted again above. Perhaps the following
    dummy module will make things even clearer.

    ---
    #include <linux/module.h>
    #include <linux/init.h>

    extern int not_defined __attribute__((weak));

    static int init(void)
    {
    return &not_defined ? -EINVAL : 0;
    }

    static void fini(void)
    {
    }

    module_init(init);
    module_exit(fini);
    ---

    You should be able to load this module.


    r~
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