Enable CMP0091 to use MSVC_RUNTIME_LIBRARY (#913)

Per https://cmake.org/cmake/help/latest/policy/CMP0091.html, we need to enable policy CMP0091 if we want to make use of MSVC_RUNTIME_LIBRARY and/or CMAKE_MSVC_RUNTIME_LIBRARY. Fixes issue #912.

Enable CMP0091 to use MSVC_RUNTIME_LIBRARY (#913)
Per https://cmake.org/cmake/help/latest/policy/CMP0091.html, we need to enable policy CMP0091 if we want to make use of MSVC_RUNTIME_LIBRARY and/or CMAKE_MSVC_RUNTIME_LIBRARY. Fixes issue #912.
370aceea · Tom Collins · GitHub · 6d5cfab5 · 370aceea
Unverified Commit 370aceea authored Jul 07, 2020 by Tom Collins Committed by GitHub Jul 07, 2020
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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
 # 3.5 is actually available almost everywhere, but this a good minimum
 cmake_minimum_required(VERSION 3.4)
+
+# enable MSVC_RUNTIME_LIBRARY target property
+# see https://cmake.org/cmake/help/latest/policy/CMP0091.html
+if(POLICY CMP0091)
+  cmake_policy(SET CMP0091 NEW)
+endif()
+
 project(YAML_CPP VERSION 0.6.3 LANGUAGES CXX)

 include(CMakePackageConfigHelpers)