Fix -Wundef warnings due to use of unguarded SDL_SSE_INTRINSICS

src/audio/SDL_audiocvt.c

@@ -181,7 +181,7 @@ static void SDLCALL SDL_TARGETING("sse3") SDL_ConvertStereoToMono_SSE3(SDL_Audio
 }
 #endif
 
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
 /* Convert from mono to stereo. Duplicate to stereo left and right. */
 static void SDLCALL SDL_TARGETING("sse") SDL_ConvertMonoToStereo_SSE(SDL_AudioCVT *cvt, SDL_AudioFormat format)
 {
@@ -842,7 +842,7 @@ static int SDL_BuildAudioCVT(SDL_AudioCVT *cvt,
             }
         } else if (channel_converter == SDL_ConvertMonoToStereo) {
             SDL_AudioFilter filter = NULL;
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
             if (!filter && SDL_HasSSE()) {
                 filter = SDL_ConvertMonoToStereo_SSE;
             }

src/video/SDL_blit_copy.c

@@ -23,7 +23,7 @@
 #include "SDL_blit.h"
 #include "SDL_blit_copy.h"
 
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
 /* This assumes 16-byte aligned src and dst */
 static SDL_INLINE void SDL_TARGETING("sse") SDL_memcpySSE(Uint8 *dst, const Uint8 *src, int len)
 {
@@ -136,7 +136,7 @@ void SDL_BlitCopy(SDL_BlitInfo *info)
         return;
     }
 
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
     if (SDL_HasSSE() &&
         !((uintptr_t)src & 15) && !(srcskip & 15) &&
         !((uintptr_t)dst & 15) && !(dstskip & 15)) {

src/video/SDL_fillrect.c

@@ -22,7 +22,7 @@
 
 #include "SDL_blit.h"
 
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
 /* *INDENT-OFF* */ /* clang-format off */
 
 #if defined(_MSC_VER) && !defined(__clang__)
@@ -376,7 +376,7 @@ int SDL_FillSurfaceRects(SDL_Surface *dst, const SDL_Rect *rects, int count,
         {
             color |= (color << 8);
             color |= (color << 16);
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
             if (SDL_HasSSE()) {
                 fill_function = SDL_FillSurfaceRect1SSE;
                 break;
@@ -389,7 +389,7 @@ int SDL_FillSurfaceRects(SDL_Surface *dst, const SDL_Rect *rects, int count,
         case 2:
         {
             color |= (color << 16);
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
             if (SDL_HasSSE()) {
                 fill_function = SDL_FillSurfaceRect2SSE;
                 break;
@@ -408,7 +408,7 @@ int SDL_FillSurfaceRects(SDL_Surface *dst, const SDL_Rect *rects, int count,
 
         case 4:
         {
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
             if (SDL_HasSSE()) {
                 fill_function = SDL_FillSurfaceRect4SSE;
                 break;

test/testautomation_intrinsics.c

@@ -205,7 +205,7 @@ SDL_TARGETING("mmx") static void kernel_ints_add_mmx(Sint32 *dest, const Sint32
 }
 #endif
 
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
 SDL_TARGETING("sse") static void kernel_floats_add_sse(float *dest, const float *a, const float *b, size_t size) {
     for (; size >= 4; size -= 4, dest += 4, a += 4, b += 4) {
         _mm_storeu_ps(dest, _mm_add_ps(_mm_loadu_ps(a), _mm_loadu_ps (b)));
@@ -392,7 +392,7 @@ static int intrinsics_testSSE(void *arg)
 {
     if (SDL_HasSSE()) {
         SDLTest_AssertCheck(SDL_TRUE, "CPU of test machine has SSE support.");
-#if SDL_SSE_INTRINSICS
+#if defined(SDL_SSE_INTRINSICS)
         {
             size_t size;
             float *dest, *a, *b;