[MacPorts] #54773: port:libgcc/port:gcc7: proposed modifications, efficiency + libc++ support

[MacPorts]

#54773: port:libgcc/port:gcc7: proposed modifications, efficiency + libc++ support
--------------------------+----------------------
  Reporter:  RJVB         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  gcc7 libgcc  |
--------------------------+----------------------

Comment (by MarcusCalhoun-Lopez):

 In [changeset:"c79d736b4cc51f1f9fbea598382ef4960f05b316/macports-ports"
 c79d736b4cc51f1f9fbea598382ef4960f05b316/macports-ports]:
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="c79d736b4cc51f1f9fbea598382ef4960f05b316"
 clang-*, gcc7: remove libgcc as a clang dependency

 * libgcc installs GCC c++ header files.
 * clang++-mp-* -stdlib=macports-libstdc++ looks for libgcc first.
  * If libgcc is installed, it is used.
  * If libgcc is NOT installed, the system libstdc++ is used.

 See https://trac.macports.org/ticket/54773
 Fixes https://trac.macports.org/ticket/54766
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54773#comment:26>
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