Added cmake dependency on version.hpp. From now cmake will automatically rerun…

Added cmake dependency on version.hpp. From now cmake will automatically rerun if version.hpp file is changed.

CMakeLists.txt

@@ -83,15 +83,19 @@ set(BUILD_WITH_DEBUG_INFO ON CACHE BOOL "Include debug info into debug libs")
 # ----------------------------------------------------------------------------
 #  Get actual OpenCV version number from sources
 # ----------------------------------------------------------------------------
-FILE(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/modules/core/include/opencv2/core/version.hpp" OPENCV_VERSION_PARTS REGEX "#define CV_.+OR_VERSION[ ]+[0-9]+" )
+SET(OPENCV_VERSION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/modules/core/include/opencv2/core/version.hpp")
+FILE(STRINGS "${OPENCV_VERSION_FILE}" OPENCV_VERSION_PARTS REGEX "#define CV_.+OR_VERSION[ ]+[0-9]+" )
 string(REGEX REPLACE ".+CV_MAJOR_VERSION[ ]+([0-9]+).*" "\\1" OPENCV_VERSION_MAJOR "${OPENCV_VERSION_PARTS}")
 string(REGEX REPLACE ".+CV_MINOR_VERSION[ ]+([0-9]+).*" "\\1" OPENCV_VERSION_MINOR "${OPENCV_VERSION_PARTS}")
 string(REGEX REPLACE ".+CV_SUBMINOR_VERSION[ ]+([0-9]+).*" "\\1" OPENCV_VERSION_PATCH "${OPENCV_VERSION_PARTS}")
 set(OPENCV_VERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}.${OPENCV_VERSION_PATCH}")
 
-
 set(OPENCV_SOVERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}")
 
+# create a dependency on version file
+# we will never use output of the following command but cmake will rerun if version file changes
+configure_file("${OPENCV_VERSION_FILE}" "${CMAKE_BINARY_DIR}/junk/version.junk" COPYONLY)
+
 if(WIN32)
     # Postfix of DLLs:
     set(OPENCV_DLLVERSION "${OPENCV_VERSION_MAJOR}${OPENCV_VERSION_MINOR}${OPENCV_VERSION_PATCH}")