From bfb4ee1597ca5448f567f349c54654e0616aef26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Janiszewski?=
 <janisozaur@users.noreply.github.com>
Date: Tue, 21 May 2019 06:38:06 +0200
Subject: [PATCH] Prevent building in source dir

Fixes #1636
---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e2329c69..cbc091c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,10 @@ endif()
 
 project(Catch2 LANGUAGES CXX VERSION 2.7.2)
 
+if (CMAKE_BINARY_DIR STREQUAL CMAKE_SOURCE_DIR)
+    message(FATAL_ERROR "Building in-source is not supported! Create a build dir and remove ${CMAKE_SOURCE_DIR}/CMakeCache.txt")
+endif()
+
 # Provide path for scripts
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/CMake")