From bb09c458c18f452a024ddb07a5754f5829454341 Mon Sep 17 00:00:00 2001
From: Jacob Siverskog <jacob@teenage.engineering>
Date: Mon, 1 Apr 2019 12:08:26 +0200
Subject: [PATCH] cmake: Prevent infinite recursion

If SDK_VERSION for whatever reason is unset cmake will end up in an
inifite recursion loop, which for me crashed using cmake version
3.13.4 and exits with an error using 3.14.1.

This may happen if ZEPHYR_TOOLCHAIN_VARIANT is set to "zephyr", but
ZEPHYR_SDK_INSTALL_DIR is invalid (or unset).

Signed-off-by: Jacob Siverskog <jacob@teenage.engineering>
---
 cmake/toolchain/zephyr/generic.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmake/toolchain/zephyr/generic.cmake b/cmake/toolchain/zephyr/generic.cmake
index 1db98b3d9e2..b8496614a69 100644
--- a/cmake/toolchain/zephyr/generic.cmake
+++ b/cmake/toolchain/zephyr/generic.cmake
@@ -1,3 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
+if(NOT DEFINED SDK_VERSION)
+  message(FATAL_ERROR "SDK_VERSION must be set")
+endif()
+
 include(${ZEPHYR_BASE}/cmake/toolchain/zephyr/${SDK_VERSION}/generic.cmake)