[MacPorts] #43856: Bug SelfUpdate

[MacPorts]

#43856: Bug SelfUpdate
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  Reporter:  firetiti@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.3.0
Resolution:              |   Keywords:
      Port:              |
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Comment (by cal@…):

 You cannot have `/usr/bin/cc` point to `/opt/local/bin/gcc`. MacPorts' GCC
 will automatically add `/opt/local/include` to its header search path,
 which means you cannot avoid the `readline.h` installed by MacPorts
 itself. Obviously, this would lead to a cyclic dependency if it worked,
 but in this case leads to a header/library mismatch and the problem you
 see.

 Please put the link back as it was, i.e.:
 {{{
 lrwxr-xr-x  1 root  wheel      5 Oct 23  2013 /usr/bin/cc -> clang
 }}}

 If you need `cc` and `gcc` to be GCC compilers (I wonder why you'd need
 that, though, clang is a pretty good compiler these days), adjust your
 `$PATH` accordingly and put the symlinks in one of the directories before
 `/usr/bin` in `$PATH` (for example, `/opt/local/bin` or `/usr/local/bin`).
 `/usr/bin` is Apple land, you should never ever modify it, simply because
 Apple's software and 3rd party software (like MacPorts) relies on it being
 in the state in which it was installed.

-- 
Ticket URL: <https://trac.macports.org/ticket/43856#comment:26>
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