Pick up SDKROOT as the sysroot fallback.

Sun Oct 13 16:49:02 UTC 2019

> Chris,
>      FYI, this has already been committed upstream.
> 
> https://gcc.gnu.org/ml/gcc-cvs/2019-10/msg00148.html
> 
>       Jack

Yes, this plan is coming along nicely -- some of us know how this came to pass :> I sent that link to Josh a while back when it came out, as support for passing the SYSROOT in base, so it's been floating around a while.

After this, a couple of older gccs maybe, and then that covers most of our toolchain.

Then we begin stripping all the baked-in -isysroot stuff out of installed ports, which is just plain bad. (And prevents, for example, reliably building against an alternate SDK, amongst other heartburn).

Ken
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