RFC: Add STB_GNU_SECONDARY

H.J. Lu hjl.tools@gmail.com
Fri Apr 20 23:40:00 GMT 2012


On Fri, Apr 20, 2012 at 3:59 PM, Ian Lance Taylor <iant@google.com> wrote:
> "H.J. Lu" <hjl.tools@gmail.com> writes:
>
>> On Fri, Apr 20, 2012 at 3:10 PM, Cary Coutant <ccoutant@google.com> wrote:
>>>> We only have very few bits to in STB_XXX field.
>>>
>>> This is exactly why I'm not in favor of this extension. The feature
>>> doesn't seem compelling enough to use up one of these precious
>>> reserved values (in fact, you're using the next-to-last one that's
>>> reserved for OS use).
>>>
>>> You want a backup definition? Put a weak def at the end of the link line.
>>>
>>
>> It doesn't work for us since the backup definition is
>> always used even if there is a normal definition in
>> a shared library or an archive.
>
> Can you expand on that?  How can you refer to the backup definition if
> there is a normal definition?
>

We need a definition for symbol, foo.  Since we don't know if there
is a definition of foo at the final link time.  We provide the backup
definition for foo.  The backup one is ignored if there is a normal one in
an archive or DSO at link time.


-- 
H.J.



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