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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