squid 6.x and GCC

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

Possibly/probably related to the earlier threads about GCC features, but 
squid 6.x appears to need GCC 8 (i.e. cannot be built with base 
compiler on NetBSD 9) because of:

# GCC 7 fails even with c++17
# src/ipc/TypedMsgHdr.h fails with
# static_assert(std::is_trivially_copyable<Pod>::value, "getPod() used for 
a P")
USE_LANGUAGES=          c c++17
GCC_REQD+=              8

Is there a workaround? Perhaps I'm missing a setting that will make it so 
that declaring c++17 is sufficient or perhaps the relevant bits can be 
patched around.

--
Stephen