Index: llvm/trunk/CMakeLists.txt
===================================================================
--- llvm/trunk/CMakeLists.txt
+++ llvm/trunk/CMakeLists.txt
@@ -236,29 +236,11 @@
 # versions).
 if( CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR AND NOT MSVC_IDE )
   message(FATAL_ERROR "In-source builds are not allowed.
-CMake would overwrite the makefiles distributed with LLVM.
 Please create a directory and run cmake from there, passing the path
 to this source directory as the last argument.
 This process created the file `CMakeCache.txt' and the directory `CMakeFiles'.
 Please delete them.")
 endif()
-if( NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR )
-  file(GLOB_RECURSE
-    tablegenned_files_on_include_dir
-    "${CMAKE_CURRENT_SOURCE_DIR}/include/llvm/*.gen")
-  file(GLOB_RECURSE
-    tablegenned_files_on_lib_dir
-    "${CMAKE_CURRENT_SOURCE_DIR}/lib/Target/*.inc")
-  if( tablegenned_files_on_include_dir OR tablegenned_files_on_lib_dir)
-    message(FATAL_ERROR "Apparently there is a previous in-source build,
-probably as the result of running `configure' and `make' on
-${CMAKE_CURRENT_SOURCE_DIR}.
-This may cause problems. The suspicious files are:
-${tablegenned_files_on_lib_dir}
-${tablegenned_files_on_include_dir}
-Please clean the source directory.")
-  endif()
-endif()
 
 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)