From 328191f65f7fb58ece6f749fbfc3462539c7afc1 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 2 Jun 2016 14:46:49 -0400
Subject: Android: Set CMAKE_SYSROOT automatically

Compute CMAKE_SYSROOT automatically for the current API and architecture
selection.  This causes the --sysroot option to be passed to GNU and
Clang compilers.
---
 Modules/Platform/Android-Initialize.cmake | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Modules/Platform/Android-Initialize.cmake b/Modules/Platform/Android-Initialize.cmake
index f12b796..f05357c 100644
--- a/Modules/Platform/Android-Initialize.cmake
+++ b/Modules/Platform/Android-Initialize.cmake
@@ -20,3 +20,22 @@
 if(CMAKE_VS_PLATFORM_NAME STREQUAL "Tegra-Android")
   return()
 endif()
+
+if(NOT CMAKE_SYSROOT)
+  if(CMAKE_ANDROID_NDK)
+    set(CMAKE_SYSROOT "${CMAKE_ANDROID_NDK}/platforms/android-${CMAKE_SYSTEM_VERSION}/arch-${CMAKE_ANDROID_ARCH}")
+  endif()
+endif()
+
+if(CMAKE_SYSROOT)
+  if(NOT IS_DIRECTORY "${CMAKE_SYSROOT}")
+    message(FATAL_ERROR
+      "Android: The system root directory needed for the selected Android version and architecture does not exist:\n"
+      "  ${CMAKE_SYSROOT}\n"
+      )
+  endif()
+else()
+  message(FATAL_ERROR
+    "Android: No CMAKE_SYSROOT was selected."
+    )
+endif()
-- 
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