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From: rick@anasazi.UUCP (Rick Coupland)
Newsgroups: net.micro.amiga
Subject: Re: Problem with Amigaterm.c and Lattice 3.03
Message-ID: <506@anasazi.UUCP>
Date: Mon, 27-Jan-86 16:31:46 EST
Article-I.D.: anasazi.506
Posted: Mon Jan 27 16:31:46 1986
Date-Received: Sat, 1-Feb-86 04:21:39 EST
Reply-To: rick@anasazi.UUCP (Rick Coupland)
Organization: Anasazi, Phoenix Az.
Lines: 44
Keywords: Lattice Amigaterm


I also had problems compiling Amigaterm using version 3.03 of the Lattice
C compiler.  I was finaly able to track this problem down to a bug in
the compiler which was incorrectly compiling experssions of the form
"&array[var+con]".  I have notified Lattice of this bug and presumable it will
be fixed in the next release.

I was able to get around the problem in Amigaterm by changing the routines
"InitFileItems" and "InitRSItems" to use pointer variables rather than
arrays with a variable subscript.  If anyone would like a copy of my modified
versions of these routines, reply by mail and I will send it.

The following is a copy of the test program which I sent to Lattice which
illustrates the bug which was causing the problems with Amigaterm:
-------------------------------------------------------------------------------
/* Test program to demonstrate a bug in version 3.03 of the amiga
   Lattice C compiler                                              */

/* Compile this program and look at the object file with OMD.
   The compiler generates code which calculates an incorrect value
   for the pointer which is being assigned to xl[n].ptr             */

struct xyz {
      struct xyz *ptr;
      short value;
};

struct xyz xl[5];

main()
{
   short n;

   for (n=0; n<4; n++) {

/* The following line compiles incorrectly */
      xl[n].ptr = &xl[n+1];

      xl[n].value = 5*n;
   }
   printf("%x, %x, %x, %x\n",&xl[1],&xl[2],&xl[3],&xl[4]);
   for (n=0; n<4; n++)
      printf("xl[%d].ptr = %x\n",n,xl[n].ptr);
}