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Petr Hosek 98bed1a704 [CMake] Use -isystem flag to access libc++ headers
This is a partial revert of D62155. Rather than copying libc++ headers
into the build directory to be later overwritten by the final headers,
use -isystem flag to access libc++ headers during CMake checks. This
should address the occasional flake we've seen, especially on Windows
builders where CMake fails to overwrite __config with the final version.

Differential Revision: https://reviews.llvm.org/D88454
2020-10-01 12:09:27 -07:00
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