On Tue, Sep 29, 2015 at 6:55 PM, Jeff Law <l...@redhat.com> wrote: > The pdp11 port fails to build with the trunk because of a warning. > Essentially VRP determines that the result of using BRANCH_COST is a > constant with the range [0..1]. That's always less than 4, 3 and the > various other magic constants used with BRANCH_COST and VRP issues a warning > about that comparison.
It does? Huh. Is it about undefined overflow which is the only thing VRP should end up warning about? If so I wonder how that happens, at least I can't reproduce it for --target=pdp11 --enable-werror build of cc1. > I expect we're going to be overhauling BRANCH_COST shortly. In the mean > time, this just revectors BRANCH_COST for the pdp11 into a function to > prevent VRP from collapsing the test and issuing the warning. > > Yes, this means more code in the pdp11 cross compiler. I'm not terribly > concerned about that and I couldn't stand the idea of scattering diagnostic > push/pop stuff all over the place to make just the pdp11 port happy. > > > Tested by building the pdp11 targets from config-all.mk. > > Installed on the trunk. > > Jeff
