https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93955
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The problem is that
/* Technically we should check this for all subexpressions, but that
runs into problems with our internal representation of pointer
subtraction and the 5.19 rules are still in flux. */
if (CONVERT_EXPR_CODE_P (TREE_CODE (r))
&& ARITHMETIC_TYPE_P (TREE_TYPE (r))
&& TREE_CODE (TREE_OPERAND (r, 0)) == ADDR_EXPR)
{
if (!allow_non_constant)
error ("conversion from pointer type %qT "
"to arithmetic type %qT in a constant expression",
TREE_TYPE (TREE_OPERAND (r, 0)), TREE_TYPE (r));
non_constant_p = true;
}
only works on the outermost expression, as the comment says.
Looks like a GCC 11 project.
