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From: ZHHU@MTUS5.BITNET
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: Is this a Lattice C 5.05 compiler bug ?
Message-ID: <90312.111715ZHHU@MTUS5.BITNET>
Date: 8 Nov 90 16:17:15 GMT
Organization: Computing Technology Services, Michigan Technological Univ.
Lines: 64

In article <90297.145845ZHHU@MTUS5.BITNET> I writes:
>Whenever an unsigned integer multiply a float or a double, it will
>crash my Amiga 1000, but the same source code works fine on a PC or

  It was compiled using the following command:
    LC -Lm program.c

>UNIX machine. This is painful, because you can be careful by type
>casting, but when you compile a PD program, especially the big files
>you cannot afford the time to find them. I use Lattice C compiler 5.05,

  I am sorry, the correct compiler version is 5.04 not 5.05.

>I wonder if this is a bug, whether 5.10 have the same problem. Can
>any body kindly take the risk of crashing, and try the following:
>
>#include <stdio.h>
>main()
>{
>    unsigned int i;
>    int j;
>    float a;
>    i = 10;
>    j = 10;
>    a = j*15.0;             /* should not crash here */
>    printf("a= %f:n",a);
>    a = i*15.0;             /* crash here on my machine*/
>    printf("a= %f:n",a);
>}

  This fact was confirmed by andrew@teslab.lab.oz.au (Andrew Phillips)
 he said:
>I was sceptical but I tried it on my A1000 with Lattice 5.04 with the
>same results.  This is very surprising.  I wonder if it is A1000
>specific?

Frank Pecher (root@bcstarc.stgt.sub.org) said:
>I own an Amiga 2000 and Lattice C5.05; the program works fine when
>compiled with
>
>    lc -f -Lm prog
>

If I compile with "lc -f -Lm ", It won't crash my Amiga 1000 either.
I also tried the other possible switches, it turned out as follows:
     lc -flm -Lm          crashes  (math library lcm.lib)
     lc -fld -Lm          crashes  (math library lcm.lib)

     lc -fim -Lm          no crashes (math library lcmieee.lib)
     lc -fid -Lm          no crashes (math library lcmieee.lib)
     lc -ffs -Lf          no crashes (math library lcmffp.lib)
So I guess the problem is with the math library lcm.lib.


There is problem woth the CodePRobe debuger too. Every time I use
the command DISPLAY or WATCH to a floating point varible it will
crash my machine. For example, it I have a variable x as float or
double, if I say
   display x
it crashes my machine, it always does. The program is compiled
with
    lc -fim -Lm -d5  program.c

Zhiquan