From eccf0daf7f482a61ba0bf463c9b9650dbf17ab72 Mon Sep 17 00:00:00 2001
From: Rahul Raj <rahul.raj@tallysolutions.com>
Date: Thu, 29 Jan 2026 02:34:14 +0530
Subject: [PATCH] Enable CMAKE_MSVC_RUNTIME_LIBRARY support via CMP0091 policy

This change enables users to configure the MSVC runtime library using
CMAKE_MSVC_RUNTIME_LIBRARY (e.g., MultiThreaded or MultiThreadedDebug)
for static linking scenarios.

Without this policy set to NEW, CMAKE_MSVC_RUNTIME_LIBRARY is ignored,
making it impossible to build with static runtime (/MT, /MTd) via
CMake parameters alone.

The conditional check ensures backward compatibility with CMake
versions prior to 3.15 where CMP0091 doesn't exist.
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e64573b..b09624a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,9 @@
 #
 
 cmake_minimum_required(VERSION 3.4.1...3.17.2)
+if(POLICY CMP0091)
+  cmake_policy(SET CMP0091 NEW)
+endif()
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMake;${CMAKE_MODULE_PATH}")
 
 project(ixwebsocket LANGUAGES C CXX VERSION 11.4.6)