> > 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 think opensuse package outs-out LTO probably for this reason. I am sometimes using LLVM as benchmark of LTO and PGO, so it would be great to have this enabled in the packages, but I had no time to do that so far. LLVM built with LTO and PGO builds quite a lot faster. I was filling bugreport for that some time ago and it seems that the bugreport linked above has quite good analysis about what breaks.
