[MacPorts] #55471: Use separate portindexes for libc++ on older systems

[MacPorts]

#55471: Use separate portindexes for libc++ on older systems
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  Reporter:  ryandesign   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:  MacPorts 2.5.0
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 Replying to [comment:14 mojca]:
 > One thing that still slightly bothers me (but I would not worry about it
 yet) is that we would sometimes need a conditional like
 > {{{
 > #!tcl
 > if {c++11 is supported} {
 >     version 1.2
 > } else {
 >     version 0.9
 > }
 > }}}

 Why does this bother you?

 > Making the decision based on stdlib alone will not work correctly on,
 say, 10.5/ppc/gcc7 configuration, nor with cxx11 1.1 PortGroup on
 10.8/libstdc++.

 Why would it not work? Doesn't it currently work, in the ports that do it?

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Ticket URL: <https://trac.macports.org/ticket/55471#comment:17>
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