[Bug tree-optimization/34148] New: [4.3 Regression] Too many VOPs, too deep tree-ssa-sccvn.c recursion

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

With the fix for PR33870 we now create _loads_ of VOPs for QTs qmake
makefile.cpp
at even -O so that all machines I have either run OOM or with a debug build of
gcc, tree-ssa-sccvn.c:1853 (DFS visiting VUSEs) recurses too deeply and blows
the 8MB stack on x86_64 (and takes too much compile-time).

Which means, we no longer can build QT.


-- 
           Summary: [4.3 Regression] Too many VOPs, too deep tree-ssa-
                    sccvn.c recursion
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: memory-hog, compile-time-hog
          Severity: blocker
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
OtherBugsDependingO 33870
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34148