[MacPorts] #60433: base: (linux) cxx_stdlib is not derived by base

[MacPorts]

#60433: base: (linux) cxx_stdlib is not derived by base
--------------------+--------------------
 Reporter:  kencu   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  base    |    Version:
 Keywords:  linux   |       Port:
--------------------+--------------------
 It seems that base does not calculate a value for {{{cxx_stdlib}}}
 automatically on linux, and in the end, leaves an empty string. This
 causes errors in builds that try to add {{{configure.cxx_stdlib}}} to
 {{{-stdlib=}}} on the build lines.

 Manually setting the value in {{{macports.conf}}} works around this for
 now:
 {{{
 cxx_stdlib    libstdc++
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60433>
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