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[Bug rtl-optimization/52785] New: Compile with -O fails in gcc 4.7


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52785

             Bug #: 52785
           Summary: Compile with -O fails in gcc 4.7
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sergio@serjux.com


Hi, 
Though compile C sources shouldn't change behavior when we change -O
(optimization) flag but we see 2 or 3 issues with -O flag.


https://bugs.gentoo.org/show_bug.cgi?id=402285#c2
compiles with -O2 and not with -O3 !? 

https://bugs.freedesktop.org/show_bug.cgi?id=47971

Compile X11-server git version, just compiles with -O0 , not with other -O


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