[PATCH] D48297: [Darwin] Add a warning for missing include path for libstdc++

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.
arphaman added reviewers: bruno, vsapsai.

Xcode 10 removes support for libstdc++, but the users just get a confusing include not file warning when including an STL header (when building for iOS6 which uses libstdc++ by default for example).
This patch adds a new warning that lets the user know that the libstdc++ include path was not found to ensure that the user is more aware of why the error occurs.

rdar://40830462


Repository:
  rC Clang

https://reviews.llvm.org/D48297

Files:
  include/clang/Basic/DiagnosticFrontendKinds.td
  include/clang/Lex/HeaderSearch.h
  lib/Frontend/InitHeaderSearch.cpp
  test/Frontend/warning-stdlibcxx-darwin.cpp

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