[Bug bootstrap/48679] [4.7 regression] bootstrap comparison failures on m68k-linux
mikpe at it dot uu.se
gcc-bugzilla@gcc.gnu.org
Wed May 4 21:29:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48679
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vmakarov at gcc dot gnu.org
--- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> 2011-05-04 21:26:22 UTC ---
Bisection identified Vladimir Makarov's big IRA update in r171649 as the source
of this regression.
gcc-4.7-20110326 (r171562) builds OK if the PR48332 fix is pre-applied, but
gcc-4.7-20110402 (r171894) fails with massive bootstrap comparison failures.
Bisecting between these points was a pain because almost all bisection points
failed to build due to ICEs, however bisection narrowed in on r171649. I then
collected the fixes for all known regression from r171649 (I counted 9 of
them), and redid the bisection with relevant fixes pre-applied. This time the
builds did not ICE but failed after stage 3 with bootstrap comparison failures.
Again bisection identified r171649. Finally I built gcc-4.7-20110402
(r171894) with all IRA changes from r171649 to r171894 reverted, and that
bootstrapped fine.
More information about the Gcc-bugs
mailing list