[Bug middle-end/82404] Unnecessary instructions in switch table

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82404

--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Mon Nov  6 09:02:15 2017
New Revision: 254437

URL: https://gcc.gnu.org/viewcvs?rev=254437&root=gcc&view=rev
Log:
Instrument function exit with __builtin_unreachable in C++

2017-11-06  Martin Liska  <mliska@suse.cz>

        PR middle-end/82404
        * c-opts.c (c_common_post_options): Set -Wreturn-type for C++
        FE.
        * c.opt: Set default value of warn_return_type.
2017-11-06  Martin Liska  <mliska@suse.cz>

        PR middle-end/82404
        * constexpr.c (cxx_eval_builtin_function_call): Handle
        __builtin_unreachable call.
        (get_function_named_in_call): Declare function earlier.
        (constexpr_fn_retval): Skip __builtin_unreachable.
        * cp-gimplify.c (cp_ubsan_maybe_instrument_return): Rename to
        ...
        (cp_maybe_instrument_return): ... this.
        (cp_genericize): Call the function unconditionally.
2017-11-06  Martin Liska  <mliska@suse.cz>

        PR middle-end/82404
        * options.c (gfc_post_options): Set default value of
        -Wreturn-type to false.

Modified:
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-opts.c
    trunk/gcc/c-family/c.opt
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c
    trunk/gcc/cp/cp-gimplify.c
    trunk/gcc/fortran/ChangeLog
    trunk/gcc/fortran/options.c