On Fri, Dec 8, 2023 at 6:09 PM Nick Desaulniers <ndesaulniers@xxxxxxxxxx> wrote: > > On paper, nothing comes to mind. No promises though. Thanks Nick -- that is useful nevertheless. > From a build system perspective, I'd rather just point users towards > LTO if they have this concern. We support full and thin lto. This > proposal would add a third variant for just rust drivers. Each > variation on LTO has a maintenance cost and each have had their own > distinct fun bugs in the past. Not sure an additional variant is > worth the maintenance cost, even if it's technically feasible. I was thinking it would be something always done for Rust object files: under a normal "no LTO" build, the Rust object files would always get the cross-language inlining done and therefore no extra dimension in the matrix. Would that help? I think it is worth at least considering, given there is also a non-trivial amount of performance to gain if we always do it, e.g. Andreas wanted it for non-LTO kernel for this reason. Cheers, Miguel
