solib search algorithm for cross-gdb

[Kris Warkentin]

Paul Koning wrote:

>When I said "cross-gdb" I was thinking about host != target -- for
>example an Intel host and a MIPS target.  Using the literal library
>path can't possibly be right in that case.
>
>Daniel suggests some other cases that are more dynamic -- host ==
>target but we're doing remote debugging.
>
>Right now we have TARGET_SO_FIND_AND_OPEN_SOLIB as a way for the
>target specific code to add another way to find libraries, but we
>don't have any way for any component to subtract ways, which is what I
>need here.
>

Setting solib-absolute-prefix is a the way to subtract searching from 
the root since it either searches <abspath> or 
<solib-abs-pref>/<abspath>, not both.  Don't know if it's practical for 
you but we explicitly set solib-absolute-prefix in our init functions so 
we never have to worry about accidentally getting /usr/lib/somelib.so 
instead of $SDK_ROOT/usr/lib/somelib.so.

cheers,

Kris