[Bug gold/15478] -no-as-needed required to avoid runtime symbol lookup error

[ccoutant at google dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15478

--- Comment #3 from Cary Coutant <ccoutant at google dot com> 2013-05-17 
04:50:56 UTC ---
> Yes that mode of operation does work but is unfortunately not an option for us
> as we would like to combine libmylib.so with a different API-compatible
> libmyplugin.so in each of a whole range of myapp executables.  To resolve the
> symbol in the libmylib.so build would mean building a number of libmylib.so
> (one for each libmyplugin.so) and this would make our build take much more
> time, as well as inflating the size of our releases.
>
> It seems that it should be fairly easy for gold to broaden its 'as-needed'
> criteria by scanning for unresolved symbols in the .so files (as well as in 
> the
> .o files) being linked.  That would seem to make the behaviour compatible with
> the old behaviour of the old linker.

I think this is a behavior of the Gnu linker that gold is better off
not copying. The linker ends up having to replicate the path searching
done at runtime by the dynamic loader, and that works only when the
libraries are in their installed locations. Making that work at
development time leads to all kinds of unexpected behavior.

> If that's not possible then -no-as-needed should be the default I think.

It is the default in gold, but GCC recently started passing
--as-needed to the linker by default.

-cary

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