Pick up SDKROOT as the sysroot fallback.

[Christopher Jones]

https://github.com/macports/macports-ports/commit/1850136d289019f3b29a5b24d3ec8ef9b23913ee <https://github.com/macports/macports-ports/commit/1850136d289019f3b29a5b24d3ec8ef9b23913ee>

Chris

> On 13 Oct 2019, at 5:49 pm, Kenneth F. Cunningham <ken.cunningham.webuse at gmail.com> wrote:
> 
>> Chris,
>>      FYI, this has already been committed upstream.
>> 
>> https://gcc.gnu.org/ml/gcc-cvs/2019-10/msg00148.html <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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