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

cmake/plugin.cmake

@@ -32,9 +32,7 @@ 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()
-  ENDIF()
+  IF(NOT EXISTS ${fcopied})
     FILE(GLOB collections ${CMAKE_CURRENT_SOURCE_DIR}/tests/collections/*)
     FOREACH(cfile ${collections})
       FILE(READ ${cfile} contents)
@@ -42,6 +40,7 @@ MACRO(PLUGIN_APPEND_COLLECTIONS plugin)
       FILE(APPEND ${CMAKE_SOURCE_DIR}/mysql-test/collections/${fname} "${contents}")
       FILE(APPEND ${fcopied} "${fname}\n")
     ENDFOREACH()
+  ENDIF()
 ENDMACRO()
 
 MACRO(MYSQL_ADD_PLUGIN)