b770021fdb
[libcxx] Fix PR22771 - Support access control SFINAE in the library version of is_convertible. Summary: Currently the conversion check does not take place in a context where access control SFINAE is applied. This patch changes the context of the test expression so that SFINAE occurs if access control does not permit the conversion. Related bug: https://llvm.org/bugs/show_bug.cgi?id=22771 Reviewers: mclow.lists, rsmith, dim Reviewed By: dim Subscribers: dim, rodrigc, emaste, cfe-commits Differential Revision: http://reviews.llvm.org/D8461 This fixes building clang, and other programs using libc++, with newer versions of gcc (specifically, gcc 4.8 and higher). Reported by: rodrigc MFC after: 1 week
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