msbit 01e8e180a8 ENV: mark gcc-6 as supporting C++11 (#349)
Add SharedEnvExtension#gcc_with_cxx11_support? to centralise the
logic for checking whether a compiler is known to support C++11.

Update logic to accept GCC 4.8 and above (including 6). Thereby also
address oversight in #163 where support for GCC 6 was added without
updating the C++11 compiler whitelist.

Add tests for Superenv#cxx11.

Closes #346.
2016-06-16 14:15:28 +02:00
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