From 777a0080cbdb98761853519b3f45136727a855c2 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@intel.com>
Date: Sat, 15 Apr 2017 06:55:46 +0300
Subject: [PATCH] cmake: disallow in-source builds

---
 CMakeLists.txt | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f2ceb9184a6..084399f3a045 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,11 +4,16 @@
 #    From the off-tree build directory, invoke:
 #      $ cmake <PATH_TO_OPENCV_ROOT>
 #
-#
-#   - OCT-2008: Initial version <joseluisblancoc@gmail.com>
-#
 # ----------------------------------------------------------------------------
 
+# Disable in-source builds to prevent source tree corruption.
+if(" ${CMAKE_SOURCE_DIR}" STREQUAL " ${CMAKE_BINARY_DIR}")
+  message(FATAL_ERROR "
+FATAL: In-source builds are not allowed.
+       You should create separate directory for build files.
+")
+endif()
+
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
 
 # Following block can broke build in case of cross-compilng
@@ -1094,13 +1099,6 @@ status("")
 
 ocv_finalize_status()
 
-# ----------------------------------------------------------------------------
-# Warn in the case of in-source build
-# ----------------------------------------------------------------------------
-if("${CMAKE_CURRENT_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_BINARY_DIR}")
-  message(WARNING "The source directory is the same as binary directory. \"make clean\" may damage the source tree")
-endif()
-
 # ----------------------------------------------------------------------------
 # CPack stuff
 # ----------------------------------------------------------------------------