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 <[email protected]> > 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 > > [email protected] > > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ > dev-platform mailing list > [email protected] > https://lists.mozilla.org/listinfo/dev-platform _______________________________________________ dev-platform mailing list [email protected] https://lists.mozilla.org/listinfo/dev-platform
