K 10
svn:author
V 6
rakuco
K 8
svn:date
V 27
2016-01-03T21:26:24.351349Z
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svn:log
V 741
MFH: r405187

Qt5: Add a patch to allow using clang, -std=c++11 and base libstdc++.

This is similar to what we did for Qt4 in r362770. Some C++11 features actually
depend on the C++ standard library, such as <initializer_list> or std::move().

So far, ports with USES=compiler:c++0x and similar failed to build with Qt5 on
FreeBSD 9.x, as base libstdc++ is very old and does not support those C++11
features.

Piggyback on a check that is already present upstream for OS X, which has the
same ancient libstdc++ version. Apple's version has a custom patch with version
macros that we can't use, so we make a broader check and disable the features
that depend on a modern standard library if libc++ is not used.

Approved by:	portmgr blanket

END