Allow undefined symbols when linking libc++abi.dll on Windows

llvm-svn: 302761

diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
index 9b3e9c4..2a0b4da 100644 (file)
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -431,7 +431,8 @@ endif()
 
 set(LIBCXXABI_HAS_UNDEFINED_SYMBOLS OFF)
 if ((NOT LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS)
-    OR (LIBCXXABI_BUILD_EXTERNAL_THREAD_LIBRARY AND LIBCXXABI_ENABLE_SHARED))
+    OR (LIBCXXABI_BUILD_EXTERNAL_THREAD_LIBRARY AND LIBCXXABI_ENABLE_SHARED)
+    OR MINGW)
   set(LIBCXXABI_HAS_UNDEFINED_SYMBOLS ON)
 endif()