From: tweenk <tweenk@users.sourceforge.net>
Date: Sun, 11 Jan 2009 21:21:20 +0000 (+0000)
Subject: UseGlibMarshal.cmake - Don't overwrite the file if it hasn't changed
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=a26770f4e44e664c0f531b059a045a894c0b0e74;p=inkscape.git

UseGlibMarshal.cmake - Don't overwrite the file if it hasn't changed
---

diff --git a/CMakeScripts/UseGlibMarshal.cmake b/CMakeScripts/UseGlibMarshal.cmake
index 6f81730e5..63d501a57 100644
--- a/CMakeScripts/UseGlibMarshal.cmake
+++ b/CMakeScripts/UseGlibMarshal.cmake
@@ -21,8 +21,16 @@ MACRO(GLIB_MARSHAL GLIB_MARSHAL_PREFIX GLIB_MARSHAL_FILE GLIB_MARSHAL_OUTPUT_LOC
         EXECUTE_PROCESS(COMMAND ${GLIB_MARSHAL_EXECUTABLE} --prefix=${GLIB_MARSHAL_PREFIX} --body ${CMAKE_CURRENT_SOURCE_DIR}/${GLIB_MARSHAL_FILE}.list
                                 OUTPUT_VARIABLE GLIB_MARSHAL_OUTPUT_CPP )
 
-        FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.h "${GLIB_MARSHAL_OUTPUT_HEADER}")
-        FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.cpp "${GLIB_MARSHAL_OUTPUT_EXTRA_LINE}")
-        FILE(APPEND ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.cpp "${GLIB_MARSHAL_OUTPUT_CPP}")
-    ENDIF(GLIB_MARSHAL_EXECUTABLE)
-ENDMACRO(GLIB_MARSHAL)
+        # check whether the generated file is the same as the existing one
+        FILE(READ ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.h GLIB_MARSHAL_HEADER_OLD)
+        IF(NOT GLIB_MARSHAL_HEADER_OLD STREQUAL GLIB_MARSHAL_OUTPUT_HEADER)
+            MESSAGE(STATUS "${GLIB_MARSHAL_FILE}.h changed; overwriting")
+            FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.h "${GLIB_MARSHAL_OUTPUT_HEADER}")
+            FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.cpp "${GLIB_MARSHAL_OUTPUT_EXTRA_LINE}")
+            FILE(APPEND ${CMAKE_CURRENT_BINARY_DIR}/${GLIB_MARSHAL_FILE}.cpp "${GLIB_MARSHAL_OUTPUT_CPP}")
+        ELSE()
+            MESSAGE(STATUS "${GLIB_MARSHAL_FILE}.h unchanged")
+        ENDIF()
+    ENDIF()
+ENDMACRO()
+