From 88f196f1a97073b9428d02b16f751af843dfd3ca Mon Sep 17 00:00:00 2001
From: click <none@none>
Date: Thu, 14 Oct 2010 22:48:55 +0200
Subject: BuildSystem: Cache results from when pulling the revision-information
 to avoid regenerating revision.h (should remove the unneeded rebuilding of
 some core-files due to that the revision.h file has changed timestamp-wise)

--HG--
branch : trunk
---
 cmake/genrev.cmake        | 14 +++++++++-----
 src/genrev/CMakeLists.txt |  1 -
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/cmake/genrev.cmake b/cmake/genrev.cmake
index 9fe49139717..29d95b4f8ff 100644
--- a/cmake/genrev.cmake
+++ b/cmake/genrev.cmake
@@ -62,8 +62,12 @@ if(NOT BUILDDIR)
 endif()
 
 # Create the actual revision.h file from the above params
-configure_file(
-  "${CMAKE_SOURCE_DIR}/revision.h.in.cmake"
-  "${BUILDDIR}/revision.h"
-  @ONLY
-)
+
+if(NOT hg_rev_id MATCHES "${hg_rev_id_cached}")
+  configure_file(
+    "${CMAKE_SOURCE_DIR}/revision.h.in.cmake"
+    "${BUILDDIR}/revision.h"
+    @ONLY
+  )
+  set(hg_rev_id_cached ${hg_rev_id} CACHE TYPE STRING)
+endif()
diff --git a/src/genrev/CMakeLists.txt b/src/genrev/CMakeLists.txt
index bcc874fbd80..316ed5b8580 100644
--- a/src/genrev/CMakeLists.txt
+++ b/src/genrev/CMakeLists.txt
@@ -10,7 +10,6 @@
 
 # Need to pass old ${CMAKE_BINARY_DIR} as param because its different at build stage
 add_custom_target(revision.h ALL
-  COMMAND ${CMAKE_COMMAND} -E remove ${CMAKE_BINARY_DIR}/revision.h
   COMMAND ${CMAKE_COMMAND} -DBUILDDIR=${CMAKE_BINARY_DIR} -P ${CMAKE_SOURCE_DIR}/cmake/genrev.cmake
   WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
 )
-- 
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