On Tue, Apr 02, 2024 at 05:09:18PM +0200, Kilian Hanich via devel wrote:
> Am 02.04.24 um 10:22 schrieb Florian Weimer:
> >> - Can some wrappers be developed to make it both easier and safer?
> >GCC already provides function multi-versioning/target clones as a
> >higher-level interface.
>
>
> Also, upstreams should by default properly mark their stuffs with
> restrictive visibilities.
>
> While we are a few decades to change the defaults, that doesn't mean
> that one can't choose the better option. So, by default one should
> choose -fvisibility=hidden and mark the public API with
> __attribute__((visibility("protected"))) or, if they really want a
> function to be interpositionable (by e.g. LD_PRELOAD) as
> __attribute__((visibility("default"))).
ISTR this also makes the library faster (faster loading I think?)
Anyway we've done it for all the virt libraries for years.
Rich.
> As a side effect, if you ever want your library be usable on Windows,
> you need to do that anyway since hidden is the default there and your
> public API must be marked explicitly. (Also, Windows doesn't support
> interposition and also doesn't support cyclic library dependencies
> without complicated hacks. So yeah, Windows kinda has the better
> defaults here.)
>
> Some newer languages do that anyway already, but we obviously can't just
> change it for C and C++ projects.
>
> But depending on the architecture this may not necessarily be possible.
> So yeah, only upstream can do that, not us.
>
>
> Regards
>
> Kilian Hanich
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