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and subject line Bug#190757: please add a warning for conversion from "int" to
"unsigned int"
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From: Robert Millan <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: please add a warning for conversion from "int" to "unsigned int"
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Date: Fri, 25 Apr 2003 17:41:20 +0200
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Package: gcc-3.2
Version: 1:3.2.3-0pre9
Severity: wishlist
the following code (compiled with -Wall -pedantic) could be
considered "buggy", because it implicitly converts a
signed int to unsigned int when calling "a". if you run it,
it will print the number 2^32-1 instead of -1.
#include <stdio.h>
int a (unsigned int b)
{
return printf ("%u\n", b);
}
int main ()
{
return a (-1);
}
this can lead to programming bugs. to prevent a programmer from
such, i'd appreciate if gcc said something like:
warning: implicit conversion from signed to unsigned
when asked to compile this code.
maybe it makes sense to warn about conversion from unsigned to
signed too, although having problems with this is unlikely,
since bit overflow only happens with really big numbers.
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux aragorn 2.2.22 #1 dl nov 25 21:59:43 CET 2002 i586
Locale: LANG=ca_ES.ISO-8859-1, [EMAIL PROTECTED] (ignored: LC_ALL set)
Versions of packages gcc-3.2 depends on:
ii binutils 2.13.90.0.18-1.7 The GNU assembler, linker and bina
ii cpp-3.2 1:3.2.3-0pre9 The GNU C preprocessor
ii gcc-3.2-base 1:3.2.3-0pre9 The GNU Compiler Collection (base
ii libc6 2.3.1-17 GNU C Library: Shared libraries an
ii libgcc1 1:3.3-0pre5 GCC support library
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Date: Fri, 25 Apr 2003 21:09:14 +0200
From: Robert Millan <[EMAIL PROTECTED]>
To: Daniel Jacobowitz <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
Subject: Re: Bug#190757: please add a warning for conversion from "int" to
"unsigned int"
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On Fri, Apr 25, 2003 at 02:48:27PM -0400, Daniel Jacobowitz wrote:
>
> No, the decision was made after looking at the false positive rate. I
> recommend you read the manual if you want to know what GCC warnings do.
> It's not quite as clear as it could be, but -Wall is in the middle of
> the page, and says "all warnings above here".
ok, closing.
--
Robert Millan
make: *** No rule to make target `war'. Stop.
Another world is possible - Just say no to genocide
