[Bug c++/87996] [8/9 Regression] "size of array is negative" error when SIZE_MAX/2 < sizeof(array) <= SIZE_MAX

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87996

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-13
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
$ cat t.C && gcc -S -Wall -Wextra t.C
char array[__SIZE_MAX__];
t.C:1:24: error: size of array ‘array’ is negative
    1 | char array[__SIZE_MAX__];
      |                        ^

The change was introduced in r258604:

r258604 | jason | 2018-03-16 14:56:01 -0400 (Fri, 16 Mar 2018) | 4 lines

        PR c++/80227 - SFINAE and negative array size.

        * decl.c (compute_array_index_type): Use
        build_converted_constant_expr and valid_constant_size_p.