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Article #1476

potential gcc-error

#1476
From: Stefan Ullrich
Date: Mon, 23 Nov 1992 19:05
51 lines
1826 bytes
Dear Sirs,

this a bug report to gcc-2.3.1.

It is a little bug we found in the gcc-2.3.1. It causes no errors
during programm execution but is a little bit confusing since you get a
warning from the compiler.

The problem is that gcc-2.3.1 doesnot accept without warning the
smallest possible integer for a signed long int if it is written in
decimal (-2147483648).  It accepts the same value as hex number
(0x80000000). It also accepts the int number (-2147483647) without
warning. We havenot found any problems during execution.

We wrote a little programm to demonstrate the behaviour of gcc-2.3.1.
This is the little programm called `example.c':

> #include <stdio.h>
>
>
> int main(void){
>
>   long int i,j;
>
>   i = -2147483648;
>   j = 0x80000000;
>   printf("\nmax_neg_dez : %d", i);
>   printf("\nmax_neg_hex : %d\n\n", j);
>   return;
> }

This the compiler call:

> gcc -o example example.c

This is the error message that was produced by gcc:

> example.c: In function `main':
> example.c:8: warning: integer constant is so large that it is unsigned

This is the ouput produced by `example':

>
> max_neg_dez : -2147483648
> max_neg_hex : -2147483648
>

We hope that this bug report will help to improve the new release of gcc.

Many thanks to all who worked on this compiler. It is a great advance
for our work.
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Message-ID: <9211231705.AA10393@mailhost.digtec.dtro.e-technik.th-darmstadt.de>
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!digtec.dtro.e-technik.TH-darmstadt.DE!stu

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Newsgroups: gnu.gcc.bug
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!digtec.dtro.e-technik.TH-darmstadt.DE!stu
From: stu@digtec.dtro.e-technik.TH-darmstadt.DE (Stefan Ullrich)
Subject: potential gcc-error
Message-ID: <9211231705.AA10393@mailhost.digtec.dtro.e-technik.th-darmstadt.de>
Sender: gnulists@ai.mit.edu
Organization: GNUs Not Usenet
Distribution: gnu
Date: Mon, 23 Nov 1992 19:05:17 GMT
Approved: bug-gcc@prep.ai.mit.edu
Lines: 52