From 74db1cbcaf27b317cb1e1e15029d717b99080627 Mon Sep 17 00:00:00 2001
From: liberize <liberize@gmail.com>
Date: Thu, 5 Dec 2024 21:20:09 +0800
Subject: [PATCH] don't opt crc magic

---
 src/main.cpp | 11 +++++++++--
 src/utils.h  |  8 ++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index e25a812..4becc5d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -42,6 +42,14 @@ enum ScriptFormat {
     LUA,
 };
 
+#ifdef VERIFY_CHECKSUM
+DISABLE_OPTIMIZATION FORCE_INLINE uint32_t* get_cksum_data() {
+    static uint32_t cksum_data[2];
+    memcpy(cksum_data, "ssccksum", 8);
+    return cksum_data;
+}
+#endif
+
 int main(int argc, char* argv[]) {
 #ifdef UNTRACEABLE
     check_debugger(true);
@@ -50,8 +58,7 @@ int main(int argc, char* argv[]) {
     std::string exe_path = get_exe_path();
     
 #ifdef VERIFY_CHECKSUM
-    static uint32_t cksum_data[2];  // use static to prevent compiler from optimizing
-    memcpy(cksum_data, "ssccksum", 8);
+    auto cksum_data = get_cksum_data();
     if (is_big_endian()) {
         cksum_data[0] = byteswap32(cksum_data[0]);
         cksum_data[1] = byteswap32(cksum_data[1]);
diff --git a/src/utils.h b/src/utils.h
index 59b58a9..700c354 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -22,6 +22,14 @@
 
 #define FORCE_INLINE __attribute__((always_inline)) inline
 
+#if defined(__GNUC__)
+#define DISABLE_OPTIMIZATION __attribute__((optimize("O0")))
+#elif defined(__clang__)
+#define DISABLE_OPTIMIZATION [[clang::optnone]]
+#else
+#define DISABLE_OPTIMIZATION
+#endif
+
 #define LOGD(fmt, ...)  /* fprintf(stdout, OBF(fmt "\n"), ##__VA_ARGS__) */
 #define LOGE(fmt, ...)  fprintf(stderr, OBF(fmt "\n"), ##__VA_ARGS__)