SDL: cmake: treat linker warnings as errors when configuring with SDL_WERROR=ON

SDL Commits
1 
From e338287e64a430773bcfc5e9f090e1572d10ecc0 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 30 Jan 2026 18:41:16 +0100
Subject: [PATCH] cmake: treat linker warnings as errors when configuring with
 SDL_WERROR=ON

---
 cmake/sdlcompilers.cmake | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/cmake/sdlcompilers.cmake b/cmake/sdlcompilers.cmake
index 3ea5a9755574d..f9d5a9c3130f1 100644
--- a/cmake/sdlcompilers.cmake
+++ b/cmake/sdlcompilers.cmake
@@ -155,6 +155,18 @@ function(SDL_AddCommonCompilerFlags TARGET)
         endif()
       endif()
     endif()
+
+    if(NOT (APPLE OR MSVC))
+      if(SDL_WERROR)
+        get_property(target_type TARGET ${TARGET} PROPERTY TYPE)
+        if(target_type MATCHES "SHARED_LIBRARY|MODULE_LIBRARY")
+          check_linker_flag(C "-Wl,-fatal-warnings" LINKER_SUPPORTS_WL_FATAL_WARNINGS)
+          if(LINKER_SUPPORTS_WL_FATAL_WARNINGS)
+            target_link_options(${TARGET} PRIVATE "-Wl,-fatal-warnings")
+          endif()
+        endif()
+      endif()
+    endif()
   endif()
 
   if(USE_CLANG)