[Bug c++/71448] pointer relational comparison fails inside constant expression

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71448

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 38658
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38658&action=edit
gcc7-pr71448.patch

Untested full patch.

That said, I wonder if it is ok that we don't reject clear out of bound
POINTER_PLUS_EXPR in constexprs, like:
static constexpr const char foo[] = "foo";
static constexpr const char *bar = "bar";

static_assert (foo < foo + 30, "check");
static_assert (foo != foo + 30, "check");
static_assert (bar <= bar + 30, "check");
static_assert (bar != bar + 30, "check");

But that is preexisting, the patch doesn't really change anything on that, and
most likely we want to handle this in the FE (if at all).