C compiler bug

[test at cit-vax]

With the 4.1bsd C compiler, the following program

    extern blech(Z);            /* <<<<< illegal (?) */

    main(argc,argv)
    int argc;
    char *argv[];
    {
	printf("[%d]\n",argc);
    }

prints out argc as [2147479384] instead of [1]. (argv  is  also  screwed
up). It seems to me that it shouldn't even get past the compiler because
of the 'Z' in the extern. Removing the 'Z' causes [1] to be  printed  as
expected. Is there a defined meaning of "extern  blech(Z)"?  This  would
seem to be a bug.
				    * Eric Holstege
				    * Caltech, Pasadena, CA.
				    * (eric at cit-vax)
				    * (...!ucbvax!cithep!citcsv!eric)
				    * (...!research!citcsv!eric)