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/CMake 3.19

CMAKE_CLANG_VFS_OVERLAY

New in version 3.19.

When cross compiling for windows with clang-cl, this variable can be an absolute path pointing to a clang virtual file system yaml file, which will enable clang-cl to resolve windows header names on a case sensitive file system.

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https://cmake.org/cmake/help/v3.19/variable/CMAKE_CLANG_VFS_OVERLAY.html