Xref: utzoo unix-pc.general:555 comp.sys.att:3005
Path: utzoo!utgpu!water!watmath!uunet!lll-winken!lll-lcc!ames!killer!gtmvax!dms3b1!dave
From: dave@dms3b1.UUCP (Dave Hanna)
Newsgroups: unix-pc.general,comp.sys.att
Subject: 3b1 shared library problems
Keywords: shlib.ifile missing symbols
Message-ID: <103@dms3b1.UUCP>
Date: 13 Apr 88 20:28:25 GMT
Distribution: na
Organization: Daltech MicroSystems, Dallas
Lines: 41


I have a problem that turned up when I tried to remake the news 
software for my 3b1.  The problem is that, when linking the shared libraries,
the symbol "daylight", which, according to the manual  CTIME(3C) is
an external int defined in  ctime, is not defined in the shared 
library ifile. The following simple file demonstrates the problem:


File chktime.c:

#include <stdio.h>
#include <time.h>

main(argc,argv)
    char **argv;
    int argc;
{
    long now = time ( (long *) 0 );

    printf ("%s", ctime(&now));
    if ( daylight ) printf("Daylight time is %d\n", daylight);
    else printf ("Daylight time is 0\n");
}

The command line
	cc chktime.c

produces an a.out that runs as expected.

The command sequence:
	cc -c chktime.c ; ld /lib/crt0s.o /lib/shlib.ifile chktime.o

produces a complaint of an undefined symbol "daylight".

I encountered the problem because the module ftime.c in the news software
contains a reference to "daylight", and the makefile I was trying to 
use tried to link with shared libraries.

Questions:  1) I suspect "daylight" is not the only symbol that has
this difficulty.  Does anyone know of others?
	2) Does anyone know a way around this other than not using
shared libraries?