On Sun, Dec 17, 2017 at 9:32 AM, Andres Freund <and...@anarazel.de> wrote: > I've since tried this via the buildfarm, but still: > > configure:14480: checking for __builtin_mul_overflow > configure:14500: ccache clang -o conftest -Wall -Wmissing-prototypes > -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels > -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv > -Wno-unused-command-line-argument -g -O2 -D_GNU_SOURCE -I/usr/include/et > conftest.c -lssl -lcrypto -lz -lreadline -lrt -lcrypt -ldl -lm >&5 > configure:14500: $? = 0 > configure:14508: result: yes > > I'm not quite following. Could you check if the same happens without > -O2? Not because that'd be a solution, but to narrow down how this > happens?
I have triggered a new test manually this morning on dangomushi because I knew that it would fail as I have tested as well stuff similar to the version you have pushed. Please note that if you added a volatile cast to "result" as well, then compilation was able to complete and regression tests passed... -- Michael
