[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         |
--------------------------+------------------------

Comment (by 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...

-- 
Ticket URL: <https://trac.macports.org/ticket/39975#comment:20>
MacPorts <http://www.macports.org/>
Ports system for OS X