2006-02-07 Dirk Mueller <dmueller@suse.com>

        * c.opt: C++ frontend supports -Wdiv-by-zero.
        * c-opts.c (c_common_handle_option): Remove dead case.

        * typeck.c (build_binary_op): Annotate div-by-zero
        warnings to make -Wno-div-by-zero have an effect.

        g++.dg/warn/Wdiv-by-zero.C: New test.
        g++.dg/warn/Wno-div-by-zero.C: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110712 138bc75d-0d04-0410-961f-82ee72b054a4