Mike Hommey writes: > On Thu, Mar 07, 2013 at 11:12:40AM +0100, Mikael Pettersson wrote: > > Mike Hommey writes: > > > On Thu, Mar 07, 2013 at 01:14:03AM -0800, Andrew Pinski wrote: > > > > On Thu, Mar 7, 2013 at 12:33 AM, Mike Hommey <mh-...@glandium.org> > > wrote: > > > > > On Thu, Mar 07, 2013 at 12:28:22AM -0800, Andrew Pinski wrote: > > > > >> On Thu, Mar 7, 2013 at 12:24 AM, Mike Hommey <mh-...@glandium.org> > > wrote: > > > > >> > Hi, > > > > >> > > > > > >> > At Mozilla, we've encountered a GCC 4.6 miscompilation in the > > ARMv6 > > > > >> > build of Firefox for Android. We'd like to evaluate whether this > > bug is > > > > >> > hitting us in more places than the one we spotted. To that end, > > we'd > > > > >> > need to know what particular bug in GCC leads to this > > miscompilation. > > > > >> > > > > > >> > The attached file is the preprocessed source, slightly > > simplified. I was > > > > >> > able to reproduce the miscompilation with both the GCC 4.6 from > > the > > > > >> > Android NDK r8d and 4.6.3 from Debian unstable. It apparently > > happens > > > > >> > for any -march, with -marm, but not -mthumb. It happens at -Os > > but not > > > > >> > -O2. > > > > >> > > > > >> No attached file. > > > > > > > > > > Sent it afterwards. > > > > > > > > Still not on the list. I bet it was too big so it was rejected by the > > > > list. Try filing a bug report instead. > > > > > > Let's try it gzipped. If it still doesn't work, I'll file a bug. > > > > This test case is not self-contained. Please file a proper bug report > > with a self-contained test case. > > It is, as long as you don't want to make a library or program out of it: > > $ arm-linux-androideabi-gcc -o pkcs11.o -c -marm -Os pkcs11.i
It's not practical to verify or bisect miscompilations by manual inspection of generated assembly or object code. We strongly prefer runtime tests, which requires that test cases can be compiled to executables.
