common, qbsp: make Error() noreturn

common/cmdlib.cc

@@ -57,7 +57,7 @@ char archivedir[1024];
  * For abnormal program terminations
  * =================
  */
-void
+[[noreturn]] void
 Error(const char *error, ...)
 {
     va_list argptr;

common/threads.cc

@@ -12,7 +12,7 @@
  *         thread/logging code.  Error() would normally be defined in
  *         either common/cmdlib.h or qbsp/qbsp.h.
  */
-void Error(const char *error, ...)
+[[noreturn]] void Error(const char *error, ...)
     __attribute__((format(printf,1,2),noreturn));
 
 /* Make the locks no-ops if we aren't running threads */

include/common/cmdlib.hh

@@ -81,7 +81,7 @@ char *ExpandPathAndArchive(char *path);
 
 double I_FloatTime(void);
 
-void Error(const char *error, ...)
+[[noreturn]] void Error(const char *error, ...)
     __attribute__((format(printf,1,2),noreturn));
 int CheckParm(const char *check);
 

include/qbsp/util.hh

@@ -42,7 +42,7 @@ void FreeAllMem(void);
 void PrintMem(void);
 
 void Message(int MsgType, ...);
-void Error(const char *error, ...)
+[[noreturn]] void Error(const char *error, ...)
     __attribute__((format(printf,1,2),noreturn));
 
 int q_snprintf(char *str, size_t size, const char *format, ...);