[MacPorts] #31948: apple-gcc42: change behavior of the -isysroot option

[MacPorts]

#31948: apple-gcc42: change behavior of the -isysroot option
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 Reporter:  royliu@…             |       Owner:  royliu@…           
     Type:  defect               |      Status:  new                
 Priority:  Normal               |   Milestone:                     
Component:  ports                |     Version:  2.0.3              
 Keywords:  haspatch             |        Port:  apple-gcc42        
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Comment(by royliu@…):

 Well, assuming the patch is reasonable, yes: All Apple-modified compiler
 ports require patching.  If I'm not mistaken, that means:
   * apple-gcc40
   * apple-gcc42
   * clang-2.9
   * clang-3.0
   * clang-3.1

 Vanilla GCC doesn't seem to be affected, as search path modifications
 aren't present.  Since this is such a far-reaching change, and since I'm
 not a compiler person, I am seeking your blessings as well as those of
 other compiler maintainers. :)

 Replying to [comment:7 jeremyhu@…]:
 > Also, do we need to do this for the vanilla gcc ports as well?

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Ticket URL: <https://trac.macports.org/ticket/31948#comment:8>
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