RFC: Add STB_GNU_SECONDARY
Fri Apr 20 20:56:00 GMT 2012
On Fri, Apr 20, 2012 at 1:26 PM, Roland McGrath <email@example.com> wrote:
>> Currently we use weak undefined symbol, foo, to do
>> if (&foo != 0)
>> foo is defined.
>> foo isn't defined.
>> We want is to define foo as a secondary symbol so that
>> we can always use foo without checking. If there is a primary
>> one in a .o file and .so file, we will get the primary one,
>> otherwise, we will use the secondary one.
> Why not use a weak definition in the file where you make the call?
It doesn't work for us since a weak definition can't be overridden
by another definition in a .so file.
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