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__builtin_addressof was added to the GCC trunk in the past week. This patch teaches libc++ about it so it can correctly provide constexpr addressof. Unfortunately this patch will break users of earlier GCC 7 builds, since we expect __builtin_addressof but one won't be provided. One option would be to only use __builtin_addressof for GCC 7.1 and above, but that means waiting for another release. Instead I've specifically chosen to break older GCC 7 versions. Since GCC 7 has yet to be released, and the 7.0 release is a development release, I believe that anybody currently using GCC 7.0 will have no issue upgrading. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@283715 91177308-0d34-0410-b5e6-96231b3b80d8