diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -485,10 +485,6 @@
 # Configure compiler.
 include(config-ix)
 
-if (LIBCXX_USE_COMPILER_RT)
-  list(APPEND LIBCXX_LINK_FLAGS "-rtlib=compiler-rt")
-endif()
-
 # Configure coverage options.
 if (LIBCXX_GENERATE_COVERAGE)
   include(CodeCoverage)
diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -262,10 +262,6 @@
   string(REPLACE "-stdlib=libstdc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 endif()
 
-if (LIBCXXABI_USE_COMPILER_RT)
-  list(APPEND LIBCXXABI_LINK_FLAGS "-rtlib=compiler-rt")
-endif()
-
 # Let the library headers know they are currently being used to build the
 # library.
 add_definitions(-D_LIBCXXABI_BUILDING_LIBRARY)