[Bug target/79671] [7 Regression] mapnik miscompilation on armv7hl since r235622

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671

--- Comment #83 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #81)
> Boost 1.63 has an array of char.

Seems they should change that to unsigned char (or std::byte).