Pick up SDKROOT as the sysroot fallback.

[Chris Jones]

> On 13 Oct 2019, at 6:20 pm, Jack Howarth <howarth.at.macports at gmail.com> wrote:
> 
> 
> Shouldn't that also strip out...
> 
>     if {${configure.sdkroot} ne ""} {
>         # We should be using --with-build-sysroot here.  Using --with-sysroot
>         # changes the behavior of the installed gcc to look in that sysroot
>         # by default instead of /.  Using --with-build-sysroot is supposed
>         # to be used during the build but not impact the installed product.
>         # Unfortunately, the build fails because the value doesn't get
>         # plumbed everywhere it is supposed to.
>         #
>         # https://trac.macports.org/ticket/53726
>         # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79885
>         configure.args-append --with-sysroot="${configure.sdkroot}"
>     }
> 
> so that if path to an Xcode-beta.app is selected in xcode-select it is honored?
>             Jack


I did not want to touch that at this point. The gcc bug report is still open, as far as I can see.

If someone wants try a build using —with-build-sysroot instead, they are very welcome to try...

Cheers chris
> 
>> On Sun, Oct 13, 2019 at 1:00 PM Christopher Jones <jonesc at hep.phy.cam.ac.uk> wrote:
>> 
>> 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
>>>> 
>>>>       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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