From 844eedd5f34f0081c959687a29e72bac196c8b20 Mon Sep 17 00:00:00 2001
From: Liu Yiqun <liuyiqun01@baidu.com>
Date: Wed, 29 Mar 2017 19:29:37 +0800
Subject: [PATCH] Add the check of Android API level which must not be lower
 than 21.

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c74f0ac617..4e5c8a8dc4f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,6 +59,10 @@ if(NOT CMAKE_BUILD_TYPE)
 endif()
 
 if(ANDROID)
+    if(${CMAKE_SYSTEM_VERSION} VERSION_LESS "21")
+        message(FATAL_ERROR "Unsupport standalone toolchains with Android API level lower than 21")
+    endif()
+
     set(WITH_GPU OFF CACHE STRING
         "Disable GPU when cross-compiling for Android" FORCE)
     set(WITH_AVX OFF CACHE STRING
-- 
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