[MacPorts] #50953: gambit-c @4.7.6 Change compiler and add desirable ./configure option

[MacPorts]

#50953: gambit-c @4.7.6 Change compiler and add desirable ./configure option
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  Reporter:  macports@…   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:  haspatch
      Port:  gambit-c     |
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Comment (by ryandesign@…):

 In MacPorts, we typically use "cxx" (not "cpp") as a substitute for the
 term "C++" in situations where the "+" symbol is not allowed, for example
 port names and variant names. "cpp" typically means C pre-processor.

 There is no need to manually add a dependency on gcc5; setting
 `configure.compiler` to the desired compiler automatically adds the
 required dependency.

 If another version of gcc would also work, you should offer compiler
 variants, using the compilers 1.0 portgroup, rather than forcing the use
 of gcc5.

 I still don't know that I approve of the change of compiler, for the
 reasons stated, especially with regard to the C++ support added by the
 variant. If users are going to use C++ code linked against gambit-c C++
 code, then they absolutely must use the same C++ library; not doing so
 will result in build failure. Forcing the user to use g++ instead of
 clang++ might be problematic for some use cases.

 I would also suggest that C++ support should be always-on. Why make it a
 variant? Variants make it difficult for other ports to depend on that
 feature.

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Ticket URL: <https://trac.macports.org/ticket/50953#comment:4>
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