As noted by richi, gcc fails to bootstrap with --enable-build-with-cxx:
gcc/tree-flow-inline.h:854:8: error: variable 't' set but not used
[-Werror=unused-but-set-variable]


-- 
           Summary: -Wunused-but-set-variable vs. explicit void cast
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44361

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