Use DEFINE_SYMBOL property to control dllexport/dllimport

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99176 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/CIndex/CMakeLists.txt b/tools/CIndex/CMakeLists.txt
index e94a786..6aa7a57 100644
--- a/tools/CIndex/CMakeLists.txt
+++ b/tools/CIndex/CMakeLists.txt
@@ -43,10 +43,10 @@
   # windows.h doesn't compile with /Za
   get_target_property(NON_ANSI_COMPILE_FLAGS CIndex COMPILE_FLAGS)
   string(REPLACE /Za "" NON_ANSI_COMPILE_FLAGS ${NON_ANSI_COMPILE_FLAGS})
-  set(NON_ANSI_COMPILE_FLAGS "${NON_ANSI_COMPILE_FLAGS} /D_CINDEX_LIB_")
   set_target_properties(CIndex PROPERTIES COMPILE_FLAGS ${NON_ANSI_COMPILE_FLAGS})
 endif(MSVC)
 
 set_target_properties(CIndex
   PROPERTIES
-  LINKER_LANGUAGE CXX)
+  LINKER_LANGUAGE CXX
+  DEFINE_SYMBOL _CINDEX_LIB_)