https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106943
--- Comment #16 from Xi Ruoyao <xry111 at gcc dot gnu.org> --- (In reply to Alexander Monakov from comment #14) > (In reply to Jan Hubicka from comment #13) > > Indeed it is quite long time problem with clang not building with lifetime > > DSE and strict aliasing. I wonder why this is not fixed on clang side? > > Because the problems were not communicated? I knew that Firefox needed > -flifetime-dse=1, but it's the first time I hear that any such problems in > Clang/LLVM were identified. > > I could not find any workaround for lifetime-dse in SUSE spec file for > llvm16. Are you saying it was known and worked around somehow? Or it is not > manifesting because LLVM is built without LTO? I guess it's because the "official" way to build LLVM with LTO is performing a 2-stage bootstrap and only enable LTO for stage 2 [1], and LLVM/Clang performs lifetime DSE less aggressively so it does not break itself... [1]: https://releases.llvm.org/16.0.0/docs/BuildingADistribution.html
