Hello, following the discussion in cfe-dev[*], I decided to put my money where my mouth is and have attached a patch that makes it possible to use __has_feature(__feature__) in place of __has_feature(feature) to protect the feature name in case the user defines a macro with the same name.
I modeled the patch after the similar handling of __attribute__ names. Jonathan [*] <http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-February/019943.html>ff.
underscore_features.diff
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