From 078eae715400a243ad16d55b9cff323cb2475e10 Mon Sep 17 00:00:00 2001
From: Andrey Kamaev <no@email>
Date: Thu, 21 Jul 2011 21:44:48 +0000
Subject: [PATCH] Added cmake dependency on version.hpp. From now cmake will
 automatically rerun if version.hpp file is changed.

---
 CMakeLists.txt | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 03553e34a..cdb389476 100644
--- a/CMakeLists.txt
+++ b/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}")