Hi,

I have started to use the `cxxstd` property to express project requirements. However, I noticed that quite a few test runners use `cxxflags` to add flags such as `-std=c++11`, thereby bypassing the boost.build filtering logic.

What is the suggested way to solve this ? Shouldn't we require users to use `cxxstd` rather than `<cxxflags>-std=...` ? Or if not, add some logic to Boost.Build to discover the presence of these values in `cxxflags` and automagically translate them into the corresponding `cxxstd` values ?

Thanks,

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