ECMQtDeclareLoggingCategory: create .categories files in build, not configure

Ensures that the files
* are re-created by build rule when accidentally deleted in the build dir
* are not getting new timestamps on every cmake run, even when content
  has not changed

1 files changed, 14 insertions, 4 deletions

diff --git a/modules/ECMQtDeclareLoggingCategory.cmake b/modules/ECMQtDeclareLoggingCategory.cmake
index bc6f4710..752b5554 100644
--- a/modules/ECMQtDeclareLoggingCategory.cmake
+++ b/modules/ECMQtDeclareLoggingCategory.cmake
@@ -329,7 +329,7 @@ function(ecm_qt_install_logging_categories)
         set(ARGS_FILE "${CMAKE_CURRENT_BINARY_DIR}/${ARGS_FILE}")
     endif()
 
-    file(WRITE ${ARGS_FILE}
+    set(_categories_content
 "# KDebugSettings data file
 # This file was generated by ecm_qt_install_logging_categories(). DO NOT EDIT!
 
@@ -350,15 +350,20 @@ function(ecm_qt_install_logging_categories)
 
         # Format:
         # logname<space>description(optional <space> DEFAULT_SEVERITY [DEFAULT_CATEGORY] as WARNING/DEBUG/INFO/CRITICAL) optional IDENTIFIER [...])
-        file(APPEND ${ARGS_FILE} "${_category} ${_description} ${_default_severity}IDENTIFIER [${_identifier}]\n")
+        string(APPEND _categories_content "${_category} ${_description} ${_default_severity}IDENTIFIER [${_identifier}]\n")
     endforeach()
 
+    file(GENERATE
+        OUTPUT ${ARGS_FILE}
+        CONTENT ${_categories_content}
+    )
+
     set(_renamed_cats_file)
     if (_renamed_categories)
         get_filename_component(_dir ${ARGS_FILE} DIRECTORY)
         get_filename_component(_base_name ${ARGS_FILE} NAME_WE)
         set(_renamed_cats_file "${_dir}/${_base_name}.renamecategories")
-        file(WRITE ${_renamed_cats_file}
+        set(_renamed_cats_content
 "# KDebugSettings data file
 # This file was generated by ecm_qt_install_logging_categories(). DO NOT EDIT!
 
@@ -373,10 +378,15 @@ function(ecm_qt_install_logging_categories)
             foreach(_category_name IN LISTS _category_name_history)
                 # Format:
                 # oldlogname<space>newlogname
-                file(APPEND ${_renamed_cats_file} "${_old_category_name} ${_category_name}\n")
+                string(APPEND _renamed_cats_content "${_old_category_name} ${_category_name}\n")
                 set(_old_category_name ${_category_name})
             endforeach()
         endforeach()
+
+        file(GENERATE
+            OUTPUT ${_renamed_cats_file}
+            CONTENT ${_renamed_cats_content}
+        )
     endif()
 
     # install files