(In reply to Martin Sirringhaus from comment #68) > Created attachment 867688 [details] > Preprocessed SkOpts_avx > > Here is the preprocessed SkOpts_avx with -flto. > Although, fwiw I suspect this file is a red herring. A quick check doesn't show any symbols instantiated besides the obviously desired ones when using -O3 -mavx. As said there are other CUs that use ISA flags upon compilation so we'd have to double check all their object files, like do readelf -s on them and grep for VecStorage for example.