[PATCH] D18088: Add a new warning to notify users of mismatched SDK and deployment target

[Chris Bieneman via cfe-commits]

beanz created this revision.
beanz added a reviewer: bob.wilson.
beanz added a subscriber: cfe-commits.

This patch adds a new driver warning -Wincompatible-sdk which notifies the user when they are mismatching the version min options and the sysroot.

The patch works by checking the sysroot (if present) for an SDK name, then matching that against the target platform. In the case of a mismatch it logs a warning.

http://reviews.llvm.org/D18088

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  include/clang/Driver/Options.td
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  test/Driver/incompatible_sdk.c

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