[PATCH] [ELF] Fix undefined symbol handling in DSO.

[Shankar Easwaran]

On 4/7/2014 2:53 PM, Shankar Easwaran wrote:
> On 4/7/2014 2:27 PM, Joerg Sonnenberger wrote:
>> (2) Undefined symbols in shared libraries pulled in via -l are ignored.
>>> By "ignored", I'd think you mean "undefined symbol from library is not
>>> fatal", right?
>> No, I really meant ignored. The most you can or should do about them is
>> check for consistency of the type. Otherwise they are completely
>> irrelevant. Trying to resolve them is just going to waste time.
> The undefined symbol from a shared library may most likely pull in a 
> defined symbol from an archive library which comes later in the link 
> line and the executable may end up exporting it.
>
> I am not sure what you meant by ignored ?

Given these oddities of choosing whether we want undefined symbols from 
shared libraries to be picked up/not, its better that lld have a flag 
like what it does right now.

With this undefined symbols would only be picked up for symbol 
resolution, if --use-shlib-undefines would be set. This would be 
different from Gnu but I think its better to be different.

Bigcheese/Joerg ?

Thanks

Shankar Easwaran

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