From b72b9d3973c5e3042ec2e63958077d585367e799 Mon Sep 17 00:00:00 2001
From: Thomas Debesse <dev@illwieckz.net>
Date: Sun, 3 Apr 2022 17:14:35 +0200
Subject: [PATCH] cmake: print a warning if SDL version is between 2.16 and
 2.20 included, ref #600

---
 CMakeLists.txt | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 49b82e30e8..80c4cbb589 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -623,8 +623,21 @@ endif()
 
 # SDL, required for all targets on win32 because of iconv and SDL_SetHint(SDL_TIMER_RESOLUTION, 0)
 if (BUILD_CLIENT OR WIN32)
-    find_package(SDL2 REQUIRED)
+    find_package(SDL2 QUIET CONFIG)
+    if(SDL2_FOUND)
+        if (SDL2_VERSION VERSION_GREATER_EQUAL "2.16"
+            AND SDL2_VERSION VERSION_LESS_EQUAL "2.20")
+            message(WARNING "SDL ${SDL2_VERSION} between version 2.16 and 2.20 is known to be buggy, see https://github.com/DaemonEngine/Daemon/issues/600")
+        endif()
+    else()
+        # CMake may be able to find SDL2 without supporting CONFIG
+        # If sdl2-config.cmake or SDL2Config.cmake isn't provided.
+        find_package(SDL2 REQUIRED)
+        message(WARNING "SDL version is unknown, version can't be checked for known bugs")
+    endif()
+
     include_directories(${SDL2_INCLUDE_DIR})
+
     if (WIN32)
         set(LIBS_ENGINE_BASE ${LIBS_ENGINE_BASE} ${SDL2_LIBRARY})
     else()