Hello Martin, I checked building libjvm.so with -Os (instead of -O3) .
I used gcc-7 on linux x86_64 . The size of libjvm.so dropped from 24M (normal night make with -O3) to 18M ( test make with -Os) . (adding the link-time gc might reduce the size by another ~ 10 % , but those 2 builds were without the ltgc ) Cannot say much so far about performance impact . Best regards, Matthias > > Hi Matthias and Erik, > > I also think this is an interesting option. > > I like the idea to generate smaller libraries. In addition to that, I could > also > imagine building with -Os (size optimized) by default and only select -O3 for > performance critical files (e.g. C2's register allocation, some gc code, ...). > > If we want to go into such a direction for all linux platforms and want to use > this s390 only change as some kind of pipe cleaner, I think this change is > fine > and can get pushed. > Otherwise, I think building s390 differently and not intending to do the same > for other linux platforms would be not so good. > > We should only make sure the exported symbols are set up properly to avoid > that this optimization throws out too much. > > My 50 Cents. > > Best regards, > Martin >
