[MacPorts] #39975: root: Add --enable-cxx11 when using libc++

[MacPorts]

#39975: root: Add --enable-cxx11 when using libc++
--------------------------+------------------------
  Reporter:  jfcaron@…    |      Owner:  jeremyhu@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:
      Port:  root         |
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Comment (by jfcaron@…):

 Replying to [comment:21 jeremyhu@…]:
 > Replying to [comment:20 jfcaron@…]:
 > > Replying to [comment:19 jeremyhu@…]:
 > > > Yeah, that's because it won't be enabled on your configuration.
 You'd need to install base trunk, choose libc++ as your C++ runtime, and
 reinstall all of your ports.
 > > >
 > > > I suggest you set this in /opt/local/etc/macports/macports.conf :
 > > > {{{
 > > > buildfromsource         always
 > > > delete_la_files    yes
 > > > cxx_stdlib libc++
 > > > }}}
 > > >
 > > > delete_la_files is there because this is a good opportunity for you
 to do that as well (it would require a full reinstall just like switching
 the C++ runtime)
 > > >
 > > > Note that Lion's libc++ is a bit older and you may run into issues
 that have been fixed in Mountain Lion and Mavericks that weren't pulled
 back into Lion software updates.
 > >
 > > Ah, that's a bit more drastic than I would like just to test a new
 portfile configuration.  I thought I just needed to have the port libcxx
 installed.  How likely is installing base trunk & switching C++ runtimes
 to break a bunch of stuff?  I'm willing to try it, but I don't want to be
 unable to do real work come Monday morning because of broken ports...
 >
 > I'm doing that on all but one of my Mountain Lion machines.
 >
 > I was doing that on my Lion machine when I still had one.
 >
 > I didn't encounter any issues which I didn't also encounter with
 Mavericks, and most of those are fixed or getting fixed.


 I think I'm going to need more specific instructions before I can test
 this on my machine.  I've followed the instructions from here:
 http://guide.macports.org/#installing.macports.subversion and here:
 https://trac.macports.org/wiki/Migration (By the way, did I need to
 actually delete the old MacPorts from the package at any point?  I just
 did sudo make install "on top" of whatever was there before.)  After "sudo
 make install" is when I added those three lines to macports.conf, is that
 right?

 After doing that, I did selfupdate and tried to upgrade my outdated ports,
 but now cctools fails to build.  I guess I need to uninstall & reinstall
 all my ports, but I'll wait for confirmation before starting that long
 process.

 Jean-François

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Ticket URL: <https://trac.macports.org/ticket/39975#comment:22>
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