[Ffmpeg-devel] build broken again...

[Måns Rullgård]

Michael Niedermayer <michaelni at gmx.at> writes:

>> >> > > Exactly, not needed. Also, shared libraries work fine without PIC.
>> >> >
>> >> > Non-PIC shared libraries only work with some (dynamic) linkers.  I've
>> >> > seen quite a few that don't work.  Go ahead, tell me they suck.  I
>> >> > don't care.
>> >>
>> >> They would also force the loaders to use copies of text segments of
>> >> those instead of sharing the same if they are loaded twice or at
>> >> different locations.
>> >> Yes I know you have 2GB of RAM but not everyone has or can.
>> >
>> > -> they should be loaded at the same location in the virtual address
>> > space of every process
>>
>> What if two libraries use the same address region?
>
> what if 2 files in one directory have the same name? or what if 2 files use 
> the same disk sector or, ...

A non-PIC library, as the name implies, must be loaded a specific
address in memory.  The first time it is mapped, a text relocation
might fix the problem, but if another application needs the same
library, and already has mapped something else at that location, there
is nothing to be done, except making a new copy.

-- 
M?ns Rullg?rd
mru at inprovide.com