Pick up SDKROOT as the sysroot fallback.

[Jack Howarth]

Chris,
     FYI, this has already been committed upstream.

https://gcc.gnu.org/ml/gcc-cvs/2019-10/msg00148.html

      Jack

On Sun, Oct 13, 2019 at 12:02 PM Chris Jones <jonesc at hep.phy.cam.ac.uk>
wrote:

> Hi,
>
> Interesting thanks . Was wondering about something like this. Let me see
> about porting it to the gcc9 build.
>
> Chris
>
> On 13 Oct 2019, at 3:24 pm, Jack Howarth <howarth.at.macports at gmail.com>
> wrote:
>
> 
>    We might want to back port this patch into out gcc9 package in order to
> avoid hard coding the SDKROOT path in the compiler during the build.
>
> [Darwin, committed] Pick up SDKROOT as the sysroot fallback.
> <https://gcc.gnu.org/ml/gcc-patches/2019-10/msg00251.html>
>
>      Jack
>
>
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