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On some platforms clock_gettime is in librt, which we don't link by default when building the tests. However it is required by the filesystem tests. This patch introduces a workaround which links librt whenever the filesystem tests are enabled. The workaround should later be replaced with a patch that selectively links both libc++fs and librt only when building filesystem specific tests. However, the way the test configuration is set up right now, this is non-trivial. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@340406 91177308-0d34-0410-b5e6-96231b3b80d8