Index: llvm/test/CMakeLists.txt
===================================================================
--- llvm/test/CMakeLists.txt
+++ llvm/test/CMakeLists.txt
@@ -221,6 +221,11 @@
   )
 set_target_properties(check-llvm PROPERTIES FOLDER "Tests")
 
+if(TARGET check-typeid-visibility)
+  add_dependencies(check-llvm check-typeid-visibility)
+endif()
+
+
 add_lit_testsuites(LLVM ${CMAKE_CURRENT_SOURCE_DIR}
   ${exclude_from_check_all}
   DEPENDS ${LLVM_TEST_DEPENDS}
Index: llvm/tools/llvm-shlib/CMakeLists.txt
===================================================================
--- llvm/tools/llvm-shlib/CMakeLists.txt
+++ llvm/tools/llvm-shlib/CMakeLists.txt
@@ -72,6 +72,21 @@
   if(TARGET libLLVMExports)
     add_dependencies(LLVM libLLVMExports)
   endif()
+
+  set(LIB_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+  set(LIB_NAME ${LIB_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}LLVM)
+
+  if(UNIX)
+      # This checks that no instanciation of llvm::Any::TypeId ends up with
+      # hidden visibility. This happens if llvm::Any is used with hidden types.
+      add_custom_target(
+        check-typeid-visibility
+        COMMAND nm -C ${LIB_NAME}-${LLVM_VERSION_MAJOR}${LLVM_VERSION_SUFFIX}${CMAKE_SHARED_LIBRARY_SUFFIX} | ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/not grep -E '[wW] llvm::Any::TypeId'
+        DEPENDS LLVM not
+        WORKING_DIRECTORY ${LIB_DIR}
+        COMMENT "Checking llvm::Any::TypeId visibility")
+  endif()
+
 endif()
 
 if(LLVM_BUILD_LLVM_C_DYLIB AND NOT MSVC)
@@ -88,8 +103,6 @@
 
   set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_BINARY_DIR}/libllvm-c.exports)
 
-  set(LIB_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
-  set(LIB_NAME ${LIB_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}LLVM)
   set(LIB_PATH ${LIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX})
   set(LIB_EXPORTS_PATH ${LIB_NAME}.exports)
   list(APPEND LLVM_DYLIB_REQUIRED_EXPORTS ${LIB_EXPORTS_PATH})