import GCC 6.4.0. see this url for details which are too large to include here:
http://gcc.gnu.org/gcc-6/changes.html
the main visible changes appear to be:
- The default mode for C++ is now -std=gnu++14 instead of -std=gnu++98. - The C and C++ compilers now support attributes on enumerators. - Diagnostics can now contain "fix-it hints" - more warnings (some added to -Wall)
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