[Bug target/67002] [5] [SH]: Bootstrap stage 2/3 comparison failure - gcc/real.o differs

["glaubitz at physik dot fu-berlin.de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67002

--- Comment #10 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Oleg Endo from comment #9)
> Not sure if this is a good idea.

I actually think it is the best option as chances are dim otherwise that we
find what's actually causing this register indeterminacy.

Looking at the build log, it's only gcc/real.o where the comparison fails, all
the others (except for the checksum files) are find. I think chances are that,
if this is actually a real bug, it might show itself more pronounced when we
use gcc-5 to build other packages.

Just look at how many bugs we were able to find in gcc-4.9 while using it as
the standard host compiler on Debian sh4.

You are right that ignoring this failure is most certainly not the best on a
release architecture that people rely on. But currently, Debian on sh4 is
merely just a port and things are expected to break from time to time.

I am currently building now a patched gcc-5_5.2.1-12 which has gcc/real.o added
to compare_exclusions, let's see how far we get.

Adrian