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If LLVM_ENABLE_LIBCXX is specified, we should append -stdlib=libc++ to build flags as early as possible, in particular, before we check for header presence (as -stdlib=libc++ modifies header lookup rules). Otherwise we can find a header at configure time (w/o -stdlib=libc++) but fail to find it at build time (with -stdlib=libc++). See PR18569 for more details. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200744 91177308-0d34-0410-b5e6-96231b3b80d8