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llvm-project/libcxx/include/__libcpp_version

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Add __libcpp_version file and __libcpp_library_version function. This patch does two seperate things. First it adds a file called "__libcpp_version" which only contains the current libc++ version (currently 4000). This file is not intended for use as a header. This file is used by Clang in order to easily determine the installed libc++ version. This allows Clang to enable/disable certain language features only when the library supports them. The second change is the addition of _LIBCPP_LIBRARY_VERSION macro, which returns the version of the installed dylib since it may be different than the headers. llvm-svn: 285382
2016-10-28 14:06:50 +08:00
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