[Bug ld/22843] Provide dependency information from the linker similar to the compiler

[rafael at espindo dot la]

https://sourceware.org/bugzilla/show_bug.cgi?id=22843

Rafael Ávila de Espíndola <rafael at espindo dot la> changed:

           What    |Removed                     |Added
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                 CC|                            |rafael at espindo dot la

--- Comment #5 from Rafael Ávila de Espíndola <rafael at espindo dot la> ---
> If we add direct dependencies to the .so files via this dependency file,
> this optimization no longer works. It would be nice if the solution to this
> problem could be made to work together with this.

I think the best way to combine the two is to create a new .so with just the
interface. Something as simple as

objcopy -j .dynsym -j .dynstr orig/test.so interface/test.so

seems to work at least for a trivial case, but is not perfect as it includes
the size of functions. The executable is linked with interface/test.so but at
runtime orig/test.so is used.

The idea proposed in this bug is particularly interesting when combined with
--start-lib/--end-lib or thin archives. If a program links with a static
library containing foo.o and bar.o but only uses foo.o, it doesn't need to be
relinked if  only bar.o changes.

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