CMake: disallow in-tree builds.

In-tree builds pollute the source directory and make version control more difficult to use effectively.
yrabbit · Jan 23, 2025 · 1623243 · 1623243
1 parent 90d746f
commit 1623243
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,3 +1,7 @@
+if (CMAKE_BINARY_DIR STREQUAL CMAKE_SOURCE_DIR)
+    message(FATAL_ERROR "In-tree builds are not supported. Instead, run:\ncmake . -B build <options> && cmake --build build")
+endif()
+
 cmake_minimum_required(VERSION 3.25)
 project(nextpnr CXX)