From 8739da61c013e20e1cc94f0619c622a65c713408 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Sat, 9 Mar 2024 15:41:07 +0200
Subject: [PATCH] Avoid strict aliasing violations. Closes #593

---
 Core/apu.c |  4 ++--
 Core/apu.h | 11 +++++++++++
 Makefile   |  2 +-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/Core/apu.c b/Core/apu.c
index e621e82a4..0f0ed16b4 100644
--- a/Core/apu.c
+++ b/Core/apu.c
@@ -100,7 +100,7 @@ static void update_sample(GB_gameboy_t *gb, GB_channel_t index, int8_t value, un
                 output.left = output.right = 0;
             }
             
-            if (*(uint32_t *)&(gb->apu_output.current_sample[index]) != *(uint32_t *)&output) {
+            if (gb->apu_output.current_sample[index].packed != output.packed) {
                 refresh_channel(gb, index, cycles_offset);
                 gb->apu_output.current_sample[index] = output;
             }
@@ -131,7 +131,7 @@ static void update_sample(GB_gameboy_t *gb, GB_channel_t index, int8_t value, un
         if (likely(!gb->apu_output.channel_muted[index])) {
             output = (GB_sample_t){(0xF - value * 2) * left_volume, (0xF - value * 2) * right_volume};
         }
-        if (*(uint32_t *)&(gb->apu_output.current_sample[index]) != *(uint32_t *)&output) {
+        if (gb->apu_output.current_sample[index].packed != output.packed) {
             refresh_channel(gb, index, cycles_offset);
             gb->apu_output.current_sample[index] = output;
         }
diff --git a/Core/apu.h b/Core/apu.h
index c8700c806..15b54a878 100644
--- a/Core/apu.h
+++ b/Core/apu.h
@@ -25,11 +25,22 @@
 
 /* APU ticks are 2MHz, triggered by an internal APU clock. */
 
+#ifdef GB_INTERNAL
+typedef union
+{
+    struct {
+        int16_t left;
+        int16_t right;
+    };
+    uint32_t packed;
+} GB_sample_t;
+#else
 typedef struct
 {
     int16_t left;
     int16_t right;
 } GB_sample_t;
+#endif
 
 typedef struct
 {
diff --git a/Makefile b/Makefile
index 98d77d975..c632b2ae4 100644
--- a/Makefile
+++ b/Makefile
@@ -164,7 +164,7 @@ endif
 
 # These must come before the -Wno- flags
 WARNINGS += -Werror -Wall -Wno-unknown-warning -Wno-unknown-warning-option -Wno-missing-braces
-WARNINGS += -Wno-nonnull -Wno-unused-result -Wno-strict-aliasing -Wno-multichar -Wno-int-in-bool-context -Wno-format-truncation
+WARNINGS += -Wno-nonnull -Wno-unused-result -Wno-multichar -Wno-int-in-bool-context -Wno-format-truncation
 
 # Only add this flag if the compiler supports it
 ifeq ($(shell $(CC) -x c -c $(NULL) -o $(NULL) -Werror -Wpartial-availability 2> $(NULL); echo $$?),0)