sdl2-compat: Ignore -Wformat warnings about %z in testautomation_stdib.c

SDL Commits
1 
From cb616088fdeee1686130052b9e4130a61f4a09bf Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Sun, 6 Aug 2023 21:44:07 +0200
Subject: [PATCH] Ignore -Wformat warnings about %z in testautomation_stdib.c

---
 CMakeLists.txt | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0cfff85..e9c7280 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -528,6 +528,22 @@ if(SDL2COMPAT_TESTS)
     "utf8.txt")
       file(COPY "${CMAKE_SOURCE_DIR}/test/${fname}" DESTINATION "${CMAKE_BINARY_DIR}")
   endforeach()
+
+  check_c_compiler_flag(-Wformat HAVE_WFORMAT)
+  if(HAVE_WFORMAT)
+    target_compile_definitions(testautomation PRIVATE HAVE_WFORMAT)
+  endif()
+
+  cmake_push_check_state()
+  if(HAVE_WFORMAT)
+    # Some compilers ignore -Wformat-extra-args without -Wformat
+    string(APPEND CMAKE_REQUIRED_FLAGS " -Wformat")
+  endif()
+  check_c_compiler_flag(-Wformat-extra-args HAVE_WFORMAT_EXTRA_ARGS)
+  cmake_pop_check_state()
+  if(HAVE_WFORMAT_EXTRA_ARGS)
+    target_compile_definitions(testautomation PRIVATE HAVE_WFORMAT_EXTRA_ARGS)
+  endif()
 endif()
 
 set(installed_targets SDL2)