Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -15,6 +15,10 @@
   cmake_policy(SET CMP0051 OLD)
 endif()
 
+if(POLICY CMP0056)
+  cmake_policy(SET CMP0056 NEW)
+endif()
+
 if(POLICY CMP0057)
   cmake_policy(SET CMP0057 NEW)
 endif()
Index: cmake/modules/CheckLinkerFlag.cmake
===================================================================
--- cmake/modules/CheckLinkerFlag.cmake
+++ cmake/modules/CheckLinkerFlag.cmake
@@ -1,8 +1,6 @@
 include(CheckCXXCompilerFlag)
 
 function(check_linker_flag flag out_var)
-  set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
-  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
   check_cxx_compiler_flag("" ${out_var})
-  set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
 endfunction()