Fix duplicated cookies (#564)

Author: zhengyu123

ddprof-lib/src/main/cpp/signalCookie.cpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2026, Datadog, Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "signalCookie.h"
+
+namespace SignalCookie {
+    namespace detail {
+        // Place tags in a named section on Linux to prevent LTO from merging
+        // or reordering them across TUs (their addresses must be unique per DSO).
+#ifdef __linux__
+        [[gnu::section(".data.signal_cookie")]] char cpu_tag;
+        [[gnu::section(".data.signal_cookie")]] char wallclock_tag;
+#else
+        char cpu_tag;
+        char wallclock_tag;
+#endif
+    }
+    void* cpu()       { return &detail::cpu_tag; }
+    void* wallclock() { return &detail::wallclock_tag; }
+}

ddprof-lib/src/main/cpp/signalCookie.h

@@ -21,19 +21,8 @@
 // forged by an unrelated in-process sender without reading our symbols, and
 // never collide with legitimate user-space pointers in third-party code.
 namespace SignalCookie {
-    namespace detail {
-        // Place tags in a named section on Linux to prevent LTO from merging
-        // or reordering them across TUs (their addresses must be unique per DSO).
-#ifdef __linux__
-        [[gnu::section(".data.signal_cookie")]] inline char cpu_tag;
-        [[gnu::section(".data.signal_cookie")]] inline char wallclock_tag;
-#else
-        inline char cpu_tag;
-        inline char wallclock_tag;
-#endif
-    }
-    inline void* cpu()       { return &detail::cpu_tag; }
-    inline void* wallclock() { return &detail::wallclock_tag; }
+    void* cpu();
+    void* wallclock();
 }
 
 #endif // SIGNAL_COOKIE_H