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

[MacPorts]

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

Comment (by mojca):

 Regarding
 {{{
 #!patch
 --- mprsyncup.orig
 +++ mprsyncup
 @@ -59,7 +59,7 @@
 PATH=${PREFIX}/bin:/bin:/usr/bin:/usr/sbin:/opt/local/bin

  # Platforms we generate indexes for. This is intentionally split on
  # whitespace later.
 -PLATFORMS="8_powerpc 8_i386 9_powerpc 9_i386 10_i386 11_i386 12_i386
 13_i386 14_i386 15_i386 16_i386 17_i386"
 +PLATFORMS="8_powerpc 8_libcxx_powerpc 8_i386 8_libcxx_i386 9_powerpc
 9_libcxx_powerpc 9_i386 9_libcxx_i386 10_i386 10_libcxx_i386 11_i386
 11_libcxx_i386 12_i386 12_libcxx_i386 13_i386 14_i386 15_i386 16_i386
 17_i386"

  # Sources information:
  BASEURL=https://github.com/macports/macports-base.git
 }}}
 I would leave the `libcxx_powerpc` platforms out. I find it nearly
 impossible to use them and the chances to ever distribute the binaries
 with libc++ are super minimal. If anything, it would make sense to support
 binaries compiled with gcc7.

--
Ticket URL: <https://trac.macports.org/ticket/55471#comment:10>
MacPorts <https://www.macports.org/>
Ports system for macOS