[evolution-data-server/wip/cmake] Better performance when installing and recompiling gsettings schemas

[Milan Crha <mcrha src gnome org>]

commit 915c0a8d0eaf6d514416593986523aa32d4bb1aa
Author: Milan Crha <mcrha redhat com>
Date:   Wed Sep 28 18:12:33 2016 +0200

    Better performance when installing and recompiling gsettings schemas

 cmake/modules/GLibTools.cmake |   29 ++++++++++++++++-------------
 1 files changed, 16 insertions(+), 13 deletions(-)
---
diff --git a/cmake/modules/GLibTools.cmake b/cmake/modules/GLibTools.cmake
index 250b756..b8c5b22 100644
--- a/cmake/modules/GLibTools.cmake
+++ b/cmake/modules/GLibTools.cmake
@@ -170,6 +170,8 @@ endif(NOT GLIB_COMPILE_SCHEMAS)
 set(GSETTINGS_SCHEMAS_DIR "${SHARE_INSTALL_DIR}/glib-2.0/schemas/")
 
 macro(add_gsettings_schemas _target _schema0)
+       set(_install_code)
+
        foreach(_schema ${_schema0} ${ARGN})
                string(REPLACE ".xml" ".valid" _outputfile "${_schema}")
                get_filename_component(_outputfile "${_outputfile}" NAME)
@@ -192,25 +194,26 @@ macro(add_gsettings_schemas _target _schema0)
                add_custom_target(gsettings-schemas-${_schema_filename} ALL DEPENDS ${_outputfile})
                add_dependencies(${_target} gsettings-schemas-${_schema_filename})
                if(ENABLE_SCHEMAS_COMPILE)
-                       # This is very inefficient, because the glib-compile-schemas is callad as many times
-                       # as the schema files are provided by the project, but there is no better way
-                       # in CMake to run a code/script after the whole `make install`
-                       install(CODE
-                               "if(\"${_schema_fullname}\" IS_NEWER_THAN 
\"${GSETTINGS_SCHEMAS_DIR}/${_schema_filename}\")
-                                       message(STATUS \"Installing: 
${GSETTINGS_SCHEMAS_DIR}/${_schema_filename}\")
-                                       execute_process(COMMAND cmake -E copy_if_different 
\"${_schema_fullname}\" \"${GSETTINGS_SCHEMAS_DIR}\"
-                                               COMMAND cmake -E chdir . \"${GLIB_COMPILE_SCHEMAS}\" 
\"${GSETTINGS_SCHEMAS_DIR}\"
-                                       )
-                               else()
-                                       message(STATUS \"Up-to-date: 
${GSETTINGS_SCHEMAS_DIR}/${_schema_filename}\")
-                               endif()
-                               ")
+                       # this is required to compile gsettings schemas like after 'make install,
+                       # because there is no better way in CMake to run a code/script after
+                       # the whole `make install`
+                       set(_install_code "${_install_code}
+                               COMMAND cmake -E copy_if_different \"${_schema_fullname}\" 
\"${GSETTINGS_SCHEMAS_DIR}\""
+                       )
                endif(ENABLE_SCHEMAS_COMPILE)
 
                # Do both, to have 'uninstall' working properly
                install(FILES ${_schema_fullname}
                        DESTINATION ${GSETTINGS_SCHEMAS_DIR})
        endforeach(_schema)
+
+       if(_install_code)
+               # Compile gsettings schemas and ensure that all of them are in the place.
+               install(CODE
+                       "execute_process(${_install_code}
+                               COMMAND cmake -E chdir . \"${GLIB_COMPILE_SCHEMAS}\" 
\"${GSETTINGS_SCHEMAS_DIR}\"
+                       )")
+       endif(_install_code)
 endmacro(add_gsettings_schemas)
 
 # This is called too early, when the schemas are not installed yet during `make install`