CC'ing mw, who is working on cross-language LTO. On Tue, Aug 28, 2018 at 3:20 PM Mike Hommey <m...@glandium.org> wrote:
> On Tue, Aug 28, 2018 at 09:14:02AM -0400, Jeff Muizelaar wrote: > > We don't LTO yet on Mac. > > We don't LTO across languages on any platform yet. Rust is LTOed on all > platforms, which removes a bunch of its symbols. Everything that is > exposed for C/C++ from Rust, though, is left alone. That's likely to > stay true even with cross-language LTO, because as far as the linker is > concerned, those FFI symbols might be used by code that link against > libxul, so it would still export them. We'd essentially need the > equivalent to -fvisibility=hidden for Rust for that to stop being true. > > Mike > > > > On Tue, Aug 28, 2018 at 5:17 AM, Emilio Cobos Álvarez <emi...@crisal.io> > wrote: > > > > > > > > > On 8/28/18 9:35 AM, Henri Sivonen wrote: > > >> > > >> Does some lld mechanism successfully remove dead code when gkrust > > >> exports some FFI function that the rest of Gecko never ends up > > >> calling? > > > > > > > > > I would expect LTO to get rid of it, but haven't checked myself. > > > > > >> I.e. in terms of code size, is it OK to vendor an FFI-exposing Rust > > >> crate where not every FFI function is used (at least right away)? > > >> > > > _______________________________________________ > > > dev-platform mailing list > > > dev-platform@lists.mozilla.org > > > https://lists.mozilla.org/listinfo/dev-platform > > _______________________________________________ > > dev-platform mailing list > > dev-platform@lists.mozilla.org > > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
