https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84210

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=107300
   Last reconfirmed|2021-12-19 00:00:00         |2024-4-3

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
And then there was an issue where we convert __builtin_unreachable to
__builtin_trap which had the similar issue so we added:
DEF_GCC_BUILTIN        (BUILT_IN_UNREACHABLE_TRAP, "unreachable trap",
BT_FN_VOID, ATTR_CONST_NORETURN_NOTHROW_LEAF_COLD_LIST)

instead, see PR 107300 for the issue there. 

So the question becomes why was __builtin_unreachable marked as const, I have
no idea.
Anyways reconfirmed.

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