[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.



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