Diagnostics for missing libraries in DSOs

[Florian Weimer]

On 08/22/2016 04:53 PM, Andreas Schwab wrote:
> On Aug 22 2016, Florian Weimer <fweimer@redhat.com> wrote:
>
>> Currently, it is extremely easy to produce a DSO which links against
>> compat symbols at run time: Just omit a required DSO when invoking the
>> static linker.  As a result, the symbol reference in the created DSO will
>> lack a version, and will be bound to a compat symbol at run time:
>>
>>   https://sourceware.org/bugzilla/show_bug.cgi?id=20489
>>
>> This is very difficult to diagnose properly.  It can also lead to current
>> binaries reintroducing historic bugs which we did not want to push on
>> applications for backwards compatibility reasons.
>>
>> What can we do here?  Can we provide a diagnostic at static link time?
>
> ld --no-allow-shlib-undefined would turn them into errors.

Interesting, this does look helpful.

Would it work in practice?  Could you build a distribution with this option?

Thanks,
Florian