[MacPorts] #33085: boost: support building for a different SDK

[MacPorts]

#33085: boost: support building for a different SDK
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  Reporter:  ryandesign@…             |       Owner:  adfernandes@…           
      Type:  defect                   |      Status:  closed                  
  Priority:  Normal                   |   Milestone:                          
 Component:  ports                    |     Version:  2.0.3                   
Resolution:  wontfix                  |    Keywords:  haspatch                
      Port:  boost                    |  
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Comment(by adfernandes@…):

 Well, I've repeated the experiment twice now: with the only change being
 in the `isysroot`  setting as per r89555, I get the same behaviour as
 #33115.

 I do not know why your build succeeds but my and that of the submitter for
 #33115 do not, but I've confirmed that both their and my builds use the
 correct `darwin` toolset.

 If you google the errors shown in #33115 with regard to `boost`, you'll
 see that `bjam` has quite a history of incorrectly-setting compiler
 options, unfortunately.

 I have tried debugging `bjam` build-scripts before, and I'm simply not
 smart enough I guess. To me, `bjam` remains completely incomprehensible
 (and for all practical purposes, undocumented), and I do not have the time
 to try and track this down, unfortunately. Heck, if previous experience is
 a guide, I wouldn't succeed anyway...

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Ticket URL: <https://trac.macports.org/ticket/33085#comment:6>
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