From 4b8a864d52fa7501af915b3f94dfbd55fe9065b8 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 22 Aug 2019 15:20:33 -0400
Subject: Add option to test CMake itself against its hosting CMake

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e3d39d..3daebee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,10 @@ if(CMAKE_BOOTSTRAP)
   unset(CMAKE_BOOTSTRAP CACHE)
 endif()
 
+if(CMake_TEST_HOST_CMAKE)
+  get_filename_component(CMake_TEST_EXTERNAL_CMAKE "${CMAKE_COMMAND}" DIRECTORY)
+endif()
+
 if(NOT CMake_TEST_EXTERNAL_CMAKE)
   if(CMAKE_SYSTEM_NAME STREQUAL "HP-UX")
     message(FATAL_ERROR
-- 
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