SDL: Disable unused local typedefs warning

From 65180804c46c54080442ebda66566e134e895232 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 23 May 2023 17:23:30 -0700
Subject: [PATCH] Disable unused local typedefs warning

This triggers on gcc 4.8.4 for compile time asserts inside of functions

Fixes https://github.com/libsdl-org/SDL/issues/7732
---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 003b7bce6d5f..76211e19bd73 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -675,6 +675,11 @@ if(USE_GCC OR USE_CLANG OR USE_INTELCC OR USE_QCC)
     target_compile_options(sdl-global-options INTERFACE "-Wshadow")
   endif()
 
+  check_c_compiler_flag(-Wunused-local-typedefs HAVE_GCC_WUNUSED_LOCAL_TYPEDEFS)
+  if(HAVE_GCC_WUNUSED_LOCAL_TYPEDEFS)
+    target_compile_options(sdl-global-options INTERFACE "-Wno-unused-local-typedefs")
+  endif()
+
   if(APPLE)
     cmake_push_check_state()
     # FIXME: don't use deprecated declarations