Fix a bug

Yuhong Guo · wesm · commit ccc03cb12dc9 · 2018-09-17T12:18:16.000-04:00
diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
@@ -652,6 +652,7 @@ if (ARROW_ORC)
 endif()
 
 if (ARROW_USE_GLOG)
+  add_definitions(-DARROW_USE_GLOG)
   SET(ARROW_STATIC_LINK_LIBS glog_static ${ARROW_STATIC_LINK_LIBS})
 endif()
 
