Of C++ (and other) runtimes

Jeremy Huddleston Sequoia jeremyhu at apple.com
Sun Oct 9 01:04:39 PDT 2016

> On Oct 7, 2016, at 08:59, René J.V. Bertin <rjvbertin at gmail.com> wrote:
> On Friday October 07 2016 11:43:48 Lawrence Velázquez wrote:
> [was Re: dbusmenu-qt5 build failure on 10.7 and 10.8 buildbots because of using libstdc++]
>> it might be useful to refine this mechanism to allow something like
>> "configure.compiler.cxx macports-gcc-XYZ", which would add a direct
>> library dependency on libgcc (among other things).
> Yep, that sounds like a good idea, but can that not be handled by the existing configure.cxx syntax?
> BTW: how risky is it to replace libc++ on newer OS X versions which do in fact provide them?

My advice is to not mess with the base OS.  There is a very good reason why I force the user to use a variant and don't even give instructions on how to use darwinup to install the libcxxabi and libcxx tarballs.

That being said, it's technically possible and they should be binary compatible.

I was actually using the newer libcxxabi and libcxx ports on Lion and Mountain Lion for a while.  The only issue I saw was that a system process (helpd or something like that) was crashing (I think on ML).  I didn't dig into the issue, but it's possible it was just a bug in the daemon that was revealed by the newer C++ runtime.  It's also quite possible there was a serious regression in the C++ runtime.  I never got around to looking into it more closely.

> And since we're talking about runtimes: is it even possible to upgrade the ObjectiveC runtime, as far as that is of any interest when you don't upgrade the rest of the SDK using it?

It's all code and objc4 is OSS.  Go nuts (http://opensource.apple.com/source/objc4/objc4-680/).  Make backups.  YMMV.

> R.
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