Linux ELF g++ weak symbol for destructor

[tmwg-gcc@inxservices.com]

   There may be other ways to declare a weak symbol, but I only know one:

  extern void w();
  extern __typeof ( w ) _._13thedestructor __attribute__ ((weak, alias ("w")))

Unfortunately, the period is not a valid part of the symbol. Version 2.95.2
says:
    ../edic/TP/TP_weak.c:4: parse error before `.'

   Is there another way to declare a destructor as a weak symbol?