[Bug 224669] [exp-run] Against projects/clang600-import branch

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224669

--- Comment #7 from Jan Beich <jbeich at FreeBSD.org> ---
- Some ports don't respect CXXFLAGS, so USE_CXXSTD has no effect
- Old but maintained projects already explitly set -std=
- New projects may expect C++14 thus break with C++98, confusing maintainers
- Changing default C++ version may break ABI, especially for GCC,
  in ports that built fine with either C++98 or C++14
- How do we define *when* to get rid of the workaround?

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