Add CMake check to prevent building in source dir
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f4218bb..d1f43c2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,25 @@
cmake_minimum_required(VERSION 3.1)
project(Corinthia)
+message("Source directory is " ${CMAKE_SOURCE_DIR})
+message("Build directory is " ${CMAKE_BINARY_DIR})
+
+# Make sure we're not building in the root of the source tree
+if ("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+ message(FATAL_ERROR
+ "
+ Building in the source directory is not supported. Instead, you should
+ create another directory specifically for the build. For example:
+
+ mkdir ~/build/corinthia
+ cd ~/build/corinthia
+ cmake -G \"${CMAKE_GENERATOR}\" ${CMAKE_SOURCE_DIR}
+
+ Before this will work, you should delete CMakeCache.txt and
+ the CMakeFiles directory that were just generated in the source
+ directory.")
+endif()
+
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
