From 0a96d156ef3bd217b5faa03fea1eb7442096f0c4 Mon Sep 17 00:00:00 2001
From: Facu <facundo@dps.uibk.ac.at>
Date: Tue, 2 May 2023 12:09:11 +0200
Subject: [PATCH] Disallow in-source build to prevent issues (#176)

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65d47efea..777c246ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,9 @@
 cmake_minimum_required(VERSION 3.13)
 
+if (CMAKE_CURRENT_BINARY_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+  message(FATAL_ERROR "Celerity does not support in-source builds.\nPlease use a dedicated build directory and remove ${CMAKE_CURRENT_BINARY_DIR}/CMakeCache.txt and ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles")
+endif()
+
 file(STRINGS "VERSION" Celerity_VERSION)
 string(REGEX MATCH "^([0-9]+)\\.([0-9]+)\\.([0-9]+)" _ "${Celerity_VERSION}")
 set(CELERITY_VERSION_MAJOR ${CMAKE_MATCH_1})