Scripts: WARN_MODE off by default

cmake/print_warnings.cmake

-IF(NOT DEFINED WARN_MODE)
-  IF(CMAKE_BUILD_TYPE MATCHES "Debug")
-    SET(WARN_MODE "late")
-  ELSE()
-    SET(WARN_MODE "early")
+IF(DEFINED WARN_MODE)
+  IF(NOT WARN_MODE STREQUAL "early" AND
+      NOT WARN_MODE STREQUAL "late" AND
+      NOT WARN_MODE STREQUAL "both")
+    MESSAGE(FATAL_ERROR "Unknown WARN_MODE: expected 'early', 'late' or 'both'")
   ENDIF()
-ENDIF()
-
-IF(NOT WARN_MODE STREQUAL "early" AND
-    NOT WARN_MODE STREQUAL "late" AND
-    NOT WARN_MODE STREQUAL "both")
-  MESSAGE(FATAL_ERROR "Unknown WARN_MODE: expected 'early', 'late' or 'both'")
-ENDIF()
 
-SET_DIRECTORY_PROPERTIES(PROPERTIES RULE_LAUNCH_COMPILE
-  "bash ${CMAKE_SOURCE_DIR}/BUILD/capture_warnings.sh ${CMAKE_BINARY_DIR} ${WARN_MODE}")
-SET_DIRECTORY_PROPERTIES(PROPERTY ADDITIONAL_MAKE_CLEAN_FILES
-  "${CMAKE_BINARY_DIR}/compile.warnings")
-ADD_CUSTOM_TARGET(rm_compile.warnings ALL
-  COMMAND rm -f compile.warnings
-  WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
-ADD_CUSTOM_TARGET(print_warnings ALL
-  COMMAND bash -c '[ -f compile.warnings ] && { echo "Warnings found:" \; cat compile.warnings \; echo "" \; } \; true'
-  DEPENDS mysqld rm_compile.warnings
-  WORKING_DIRECTORY "${CMAKE_BINARY_DIR}")
+  SET_DIRECTORY_PROPERTIES(PROPERTIES RULE_LAUNCH_COMPILE
+    "bash ${CMAKE_SOURCE_DIR}/BUILD/capture_warnings.sh ${CMAKE_BINARY_DIR} ${WARN_MODE}")
+  SET_DIRECTORY_PROPERTIES(PROPERTY ADDITIONAL_MAKE_CLEAN_FILES
+    "${CMAKE_BINARY_DIR}/compile.warnings")
+  ADD_CUSTOM_TARGET(rm_compile.warnings ALL
+    COMMAND rm -f compile.warnings
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+  ADD_CUSTOM_TARGET(print_warnings ALL
+    COMMAND bash -c '[ -f compile.warnings ] && { echo "Warnings found:" \; cat compile.warnings \; echo "" \; } \; true'
+    DEPENDS mysqld rm_compile.warnings
+    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}")
 
-IF(TARGET explain_filename-t)
-  ADD_DEPENDENCIES(print_warnings explain_filename-t)
-ENDIF()
+  IF(TARGET explain_filename-t)
+    ADD_DEPENDENCIES(print_warnings explain_filename-t)
+  ENDIF()
 
-IF(TARGET mysql_client_test)
-  ADD_DEPENDENCIES(print_warnings mysql_client_test)
-ENDIF()
+  IF(TARGET mysql_client_test)
+    ADD_DEPENDENCIES(print_warnings mysql_client_test)
+  ENDIF()
 
-IF(TARGET udf_example)
-  ADD_DEPENDENCIES(print_warnings udf_example)
+  IF(TARGET udf_example)
+    ADD_DEPENDENCIES(print_warnings udf_example)
+  ENDIF()
 ENDIF()