os0thread.c, configure.in:

  Make the typecast trick pthread_t -> os_thread_id_t safer, but a full fix needs usage of appropriate Posix functions

innobase/configure.in

@@ -86,7 +86,7 @@ fi
 
 case "$target_os" in
        hp*)
-	 CFLAGS="$CFLAGS -DUNIV_MUST_NOT_INLINE";;
+	 CFLAGS="$CFLAGS -DUNIV_MUST_NOT_INLINE -DUNIV_HPUX";;
        irix*)
 	 CFLAGS="$CFLAGS -DUNIV_MUST_NOT_INLINE";;
        osf*)

innobase/os/os0thread.c

@@ -32,12 +32,27 @@ os_thread_get_curr_id(void)
 
 	pthr = pthread_self();
 
+#ifdef UNIV_HPUX	
 	/* TODO: in the future we have to change os_thread_id
 	   to pthread_t; the following cast may work in a wrong way on some
 	   systems if pthread_t is a struct; this is just a quick fix
 	   for HP-UX to eliminate a compiler warning */
 
+
+	/* The below typecast trick will certainly not work if this assertion
+	   fails */
+
+	ut_a(sizeof(pthread_t) >= sizeof(os_thread_id_t));
+
 	return(*(os_thread_id_t*)((void*) (&pthr)));
+#else
+	/* TODO: define os_thread_id_t in Unix as the same as pthread_t
+	   and compare them with appropriate Posix pthread functions!
+	   The following typecast will not work if pthread_t is not
+	   an integer or a pointer to a unique object for the thread! */
+
+	return((os_thread_id_t)pthr);
+#endif
 #endif
 }