RETURN doesn't exactly return from the macro...

cmake/plugin.cmake

@@ -32,16 +32,15 @@ INCLUDE(${MYSQL_CMAKE_SCRIPT_DIR}/cmake_parse_arguments.cmake)
 
 MACRO(PLUGIN_APPEND_COLLECTIONS plugin)
   SET(fcopied "${CMAKE_CURRENT_SOURCE_DIR}/tests/collections/FilesCopied")
-  IF(EXISTS ${fcopied})
-    RETURN()
+  IF(NOT EXISTS ${fcopied})
+    FILE(GLOB collections ${CMAKE_CURRENT_SOURCE_DIR}/tests/collections/*)
+    FOREACH(cfile ${collections})
+      FILE(READ ${cfile} contents)
+      GET_FILENAME_COMPONENT(fname ${cfile} NAME)
+      FILE(APPEND ${CMAKE_SOURCE_DIR}/mysql-test/collections/${fname} "${contents}")
+      FILE(APPEND ${fcopied} "${fname}\n")
+    ENDFOREACH()
   ENDIF()
-  FILE(GLOB collections ${CMAKE_CURRENT_SOURCE_DIR}/tests/collections/*)
-  FOREACH(cfile ${collections})
-    FILE(READ ${cfile} contents)
-    GET_FILENAME_COMPONENT(fname ${cfile} NAME)
-    FILE(APPEND ${CMAKE_SOURCE_DIR}/mysql-test/collections/${fname} "${contents}")
-    FILE(APPEND ${fcopied} "${fname}\n")
-  ENDFOREACH()
 ENDMACRO()
 
 MACRO(MYSQL_ADD_PLUGIN)