[MacPorts] #67314: R: do we need sysroot to be detected on systems without xcrun?

[MacPorts]

#67314: R: do we need sysroot to be detected on systems without xcrun?
---------------------------+-----------------------------------------
  Reporter:  barracuda156  |      Owner:  kjellpk
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  tiger, leopard, snowleopard
      Port:  R             |
---------------------------+-----------------------------------------

Comment (by barracuda156):

 Replying to [comment:1 kencu]:
 > that should be removed from the R ports.
 >
 > We want all MacPorts software to build against the SDK we have selected
 in MacPorts, not against something randomly found by xcrun.
 >
 > MacPorts base sets SDKROOT to the proper SDK to be used, and gcc and
 clang obey that unless they are overridden on the command line with an
 {{{-isysroot=/path/to/SDK}}}.
 >
 > Passing -isysroot is unnecessary, but if it is going to be passed, it
 should be to the SDK that MacPorts has requested be used. That might
 require patching.

 Thank you.

 I am not really sure where this creeps in from though. I did not set it in
 `R` PR, that is sure.

-- 
Ticket URL: <https://trac.macports.org/ticket/67314#comment:2>
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