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This reverts commit r260235. It breaks LLVM's bootstrap when building with a -gcc-toolchain and the system's gcc installation does not provide the libatomic library and its headers. We should check whether LIBCXX_GCC_TOOLCHAIN is set and adjust the flags accordingly. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@260323 91177308-0d34-0410-b5e6-96231b3b80d8