diff --git a/libcxx/include/__functional/function.h b/libcxx/include/__functional/function.h
--- a/libcxx/include/__functional/function.h
+++ b/libcxx/include/__functional/function.h
@@ -35,6 +35,8 @@
 
 // bad_function_call
 
+_LIBCPP_DIAGNOSTIC_PUSH
+_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")
 class _LIBCPP_EXCEPTION_ABI bad_function_call
     : public exception
 {
@@ -52,6 +54,7 @@
     virtual const char* what() const _NOEXCEPT;
 #endif
 };
+_LIBCPP_DIAGNOSTIC_POP
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_bad_function_call()
diff --git a/libcxx/test/libcxx/clang_tidy.sh.cpp b/libcxx/test/libcxx/clang_tidy.sh.cpp
--- a/libcxx/test/libcxx/clang_tidy.sh.cpp
+++ b/libcxx/test/libcxx/clang_tidy.sh.cpp
@@ -9,7 +9,7 @@
 // REQUIRES: has-clang-tidy
 // XFAIL: modules-build
 
-// RUN: clang-tidy %s --warnings-as-errors=* -header-filter=.* -- -Wno-unknown-warning-option %{compile_flags}
+// RUN: clang-tidy %s --warnings-as-errors=* -header-filter=.* -- -Wweak-vtables -Wno-unknown-warning-option %{compile_flags}
 // -Wno-unknown-warning-option tells clang-tidy to ignore '-W' command-line arguments that it doesn't know.
 // There are some GCC-specific ones where clang-tidy would warn otherwise.