[MacPorts] LibcxxOnOlderSystems modified

[MacPorts]

Page "LibcxxOnOlderSystems" was changed by ryandesign at macports.org
Diff URL: <https://trac.macports.org/wiki/LibcxxOnOlderSystems?action=diff&version=19>
Revision 19
Comment: Add introductory paragraph explaining why one might want to do this
Changes:
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Index: LibcxxOnOlderSystems
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--- LibcxxOnOlderSystems (version: 18)
+++ LibcxxOnOlderSystems (version: 19)
@@ -1,4 +1,10 @@
 = Using libc++ on older system =
+
+More and more C++ software is being written using the C++11 standard. The default C++ runtime on OS X 10.9 and later is libc++ which supports C++11 but on OS X 10.8 and earlier the default C++ runtime is a version of libstdc++ based on GCC 4.2.1 which does not support C++11. If you wish to build C++11-using software on 10.8 or earlier, you can switch MacPorts to use libc++ instead of libstdc++, but this must be done for MacPorts as a whole; it can't be done for individual ports.
+
+At this time the MacPorts project does not build binary packages for libc++ on systems older than 10.9, so if you make this change, MacPorts will be building all ports from source.
+
+If you use MacPorts C++-using ports as dependencies for C++-using software that you compile outside of MacPorts, you must compile that software using libc++ as well.
 
 == Lion and Mountain Lion ==
 
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Page URL: <https://trac.macports.org/wiki/LibcxxOnOlderSystems>
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