[cfe-dev] [libcxx] using has_extension instead of has_feature

[Jean-Daniel Dupas]

Hello,

I'd like to propose to use __has_extension instead of __has_feature to detect available features in libc++ headers.

Using __has_feature prevent usage of functionalities provided by clang as extension when compiling in older standard mode.

As __has_extension is a superset of __has_feature, it should not have any effect on people using the library in c++0x mode.

And when using -pedantic, __has_extension have the same behavior than __has_feature, so it is always be possible to disable extensions if needed.

Path to perform this change (if accepted) attached.

Thanks

-- Jean-Daniel



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