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[libcxx] Unify LIBCXX_<ABI-Name>_INCLUDE_PATHS to be…

Authored by EricWF on Mar 19 2015, 1:59 PM.

Description

[libcxx] Unify LIBCXX_<ABI-Name>_INCLUDE_PATHS to be LIBCXX_CXX_ABI_INCLUDE_PATHS

Summary:
Clean up all the different possible CMake options for specifying the ABI include paths into one CMake option named LIBCXX_CXX_ABI_INCLUDE_PATHS.
The documentation has been updated to reflect this change.

For the next week I have added explicit errors if any of the old flags is used. These errors inform users of the change and the new option to use.

Before committing the change I will announce this change on cfe-dev.

Reviewers: danalbert, mclow.lists

Reviewed By: danalbert, mclow.lists

Subscribers: jroelofs, cbergstrom, cfe-commits

Differential Revision: http://reviews.llvm.org/D5039

llvm-svn: 232762