diff --git a/compiler-rt/cmake/Modules/AddCompilerRT.cmake b/compiler-rt/cmake/Modules/AddCompilerRT.cmake
--- a/compiler-rt/cmake/Modules/AddCompilerRT.cmake
+++ b/compiler-rt/cmake/Modules/AddCompilerRT.cmake
@@ -607,6 +607,9 @@
     CMAKE_READELF
     CMAKE_SYSROOT
     LIBCXX_HAS_MUSL_LIBC
+    LIBCXX_HAS_PTHREAD_LIB
+    LIBCXX_HAS_RT_LIB
+    LIBCXXABI_HAS_PTHREAD_LIB
     PYTHON_EXECUTABLE
     Python3_EXECUTABLE
     Python2_EXECUTABLE