From 40af109144062fa80fad3113e6559a2326491141 Mon Sep 17 00:00:00 2001
From: Renz Bagaporo <renz.bagaporo@espressif.com>
Date: Tue, 7 Apr 2020 17:39:36 +0800
Subject: [PATCH] cmake: error out on building in IDF_PATH root dir

---
 CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c5de7151b..91c1399341 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,12 @@
 cmake_minimum_required(VERSION 3.5)
 project(esp-idf C CXX ASM)
 
+if(CMAKE_CURRENT_LIST_DIR STREQUAL CMAKE_SOURCE_DIR)
+    message(FATAL_ERROR "Current directory '${CMAKE_CURRENT_LIST_DIR}' is not buildable. "
+    "Change directories to one of the example projects in '${CMAKE_CURRENT_LIST_DIR}/examples' and try "
+    "again.")
+endif()
+
 unset(compile_options)
 unset(c_compile_options)
 unset(cxx_compile_options)