Fix SDL static linking

.github/workflows/build.yml

@@ -264,11 +264,6 @@ jobs:
           else
             CMAKE_EXTRA_ARGS+=('-DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded')
           fi
-
-          # Fix SDL static linking (see linked issues in patch file)
-          pushd extern/SDL
-          env EMAIL=root@localhost git am ../SDL-Fix-MSVC-static-runtime-linking.patch
-          popd
         elif [ '${{ matrix.config.compiler }}' == 'mingw' ]; then
           CMAKE_EXTRA_ARGS+=('-DCMAKE_TOOLCHAIN_FILE=scripts/Cross-MinGW-${{ steps.windows-identify.outputs.mingw-target }}.cmake')
         elif [ '${{ runner.os }}' == 'macOS' ]; then

CMakeLists.txt

@@ -167,8 +167,13 @@ if (SYSTEM_SDL2)
   endif()
   message(STATUS "Using system-installed SDL2")
 else()
-  set(SDL_SHARED OFF)
-  set(SDL_STATIC ON)
+  set(SDL_SHARED OFF CACHE BOOL "Force no dynamically-linked SDL" FORCE)
+  set(SDL_STATIC ON CACHE BOOL "Force statically-linked SDL" FORCE)
+  # https://github.com/libsdl-org/SDL/issues/1481
+  # On 2014-06-22 17:15:50 +0000, Sam Lantinga wrote:
+  #   If you link SDL statically, you also need to define HAVE_LIBC so it builds with the C runtime that your application uses.
+  #   This should probably go in a FAQ.
+  set(SDL_LIBC ON CACHE BOOL "Tell SDL that we want it to use our C runtime (required for proper static linking)" FORCE)
   add_subdirectory(extern/SDL EXCLUDE_FROM_ALL)
   list(APPEND DEPENDENCIES_INCLUDE_DIRS extern/SDL/include)
   list(APPEND DEPENDENCIES_LIBRARIES SDL2-static)

extern/SDL-Fix-MSVC-static-runtime-linking.patch

@@ -1,35 +0,0 @@
-From 34d3dcd98697af081625ccea7a41a3c47806c4ff Mon Sep 17 00:00:00 2001
-From: OPNA2608 <christoph.neidahl@gmail.com>
-Date: Mon, 28 Mar 2022 16:43:16 +0200
-Subject: [PATCH] SDL: Fix MSVC static runtime linking
-
-See https://github.com/libsdl-org/SDL/issues/3662, https://github.com/libsdl-org/SDL/issues/4258.
----
- src/stdlib/SDL_stdlib.c | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/src/stdlib/SDL_stdlib.c b/src/stdlib/SDL_stdlib.c
-index 9d785aad5..dfac4d7c3 100644
---- a/src/stdlib/SDL_stdlib.c
-+++ b/src/stdlib/SDL_stdlib.c
-@@ -550,7 +550,7 @@ __declspec(selectany) int _fltused = 1;
- #endif
- 
- /* The optimizer on Visual Studio 2005 and later generates memcpy() and memset() calls */
--#if _MSC_VER >= 1400
-+#if (_MSC_VER >= 1400) && !defined(_MT)
- extern void *memcpy(void* dst, const void* src, size_t len);
- #pragma intrinsic(memcpy)
- 
-@@ -570,7 +570,7 @@ memset(void *dst, int c, size_t len)
- {
-     return SDL_memset(dst, c, len);
- }
--#endif /* _MSC_VER >= 1400 */
-+#endif /* (_MSC_VER >= 1400) && !defined(_MT) */
- 
- #ifdef _M_IX86
- 
--- 
-2.33.1
-