diff --git a/cmake/Modules/FindLLVM.cmake b/cmake/Modules/FindLLVM.cmake
index 064e6f5c..be2accf4 100644
--- a/cmake/Modules/FindLLVM.cmake
+++ b/cmake/Modules/FindLLVM.cmake
@@ -95,6 +95,14 @@ else()
     llvm_set(LIBRARY_DIRS libdir)
     llvm_set_libs(LIBRARIES libfiles "${LLVM_LIBRARY_DIRS}/")
     llvm_set(ROOT_DIR prefix)
+
+    # On CMake builds of LLVM, the output of llvm-config --cxxflags does not
+    # include -fno-rtti, leading to linker errors. Be sure to add it.
+    if(CMAKE_COMPILER_IS_GNUCXX OR ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"))
+        if(NOT ${LLVM_CXXFLAGS} MATCHES "-fno-rtti")
+            set(LLVM_CXXFLAGS "${LLVM_CXXFLAGS} -fno-rtti")
+        endif()
+    endif()
 endif()
 
 string(REGEX REPLACE "([0-9]+).*" "\\1" LLVM_VERSION_MAJOR "${LLVM_VERSION_STRING}" )