External GCC Update

[David Chisnall]

On 22/02/2019 19:00, John Baldwin wrote:
> 3) I add support for an /etc/src.conf.d dir that can hold files that get
>     treated as if they are part of /etc/src.conf.  The current patch on
>     github for this only fixes world and not yet kern.pre.mk and probably
>     needs the most review if we want to go forward with this route.  With
>     this, I plan to have the base/* packages install suitable files in this
>     dir that disable build of the src-based components and also set
>     WITH_BASE_<foo> to make sure 'delete-old' DTRT.

Having a file outside of both the source and build directories that 
controls aspects of the build is already a cause of significant pain 
when building multiple different configurations of the FreeBSD base 
system.  This sounds as if it would make things considerably worse.

David