Bug#126411: marked as done (gcc-3.0: Improper warning when casting from pointer to non-const array to const)
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and subject line Not a bug: Improper warning when casting from pointer to non-const array to const
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>From agthorr@barsoom.org Tue Dec 25 00:14:32 2001
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From: Agthorr <agthorr@barsoom.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: gcc-3.0: Improper warning when casting from pointer to non-const array to const
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Package: gcc-3.0
Version: 1:3.0.2-4
Severity: normal
gcc generates a warning for the following test program, that I believe
is inappropriate. The warning is that it cannot implicitly cast from
(foo *) to (const foo *). This occurs when foo is an array type. The
sample program compiles without warnings if you remove the "const"
keyword, or if you remove the [16] making foo an array.
This also occurs in gcc 2.95.4.
This is a problem for me since I normally compile with -Werror and
make rigorous use of const. I can make explicit casts as a temporary
fix, but this makes my code ugly ;)
-- Agthorr
------------------------------------------------------------------------
typedef char foo[16];
void bar (const foo *xyzzy)
{}
int main(void)
{
foo bozz;
bar (&bozz);
return 0;
}
------------------------------------------------------------------------
-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux eleutheromania 2.4.16 #1 Tue Dec 4 11:20:43 PST 2001 i686
Locale: LANG=C, LC_CTYPE=
Versions of packages gcc-3.0 depends on:
ii binutils 2.11.92.0.12.3-3 The GNU assembler, linker and bina
ii cpp-3.0 1:3.0.2-4 The GNU C preprocessor.
ii gcc-3.0-base 1:3.0.2-4 The GNU Compiler Collection (base
ii libc6 2.2.4-7 GNU C Library: Shared libraries an
ii libgcc1 1:3.0.2-4 GCC support library.
---------------------------------------
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>From doko@cs.tu-berlin.de Sat Jan 11 05:19:04 2003
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From: Matthias Klose <doko@cs.tu-berlin.de>
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Message-ID: <15903.64872.815380.390059@gargle.gargle.HOWL>
Date: Sat, 11 Jan 2003 12:18:00 +0100
To: <126411-done@bugs.debian.org>
Subject: Not a bug: Improper warning when casting from pointer to non-const
array to const
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not a bug. closing the report.
Joseph S. Myers writes:
> On Fri, 27 Dec 2002, Matthias Klose wrote:
>
> > gcc generates a warning for the following test program, that I believe
> > is inappropriate. The warning is that it cannot implicitly cast from
> > (foo *) to (const foo *). This occurs when foo is an array type. The
> > sample program compiles without warnings if you remove the "const"
> > keyword, or if you remove the [16] making foo an array.
>
> It is an assignment from "pointer to array[16] of char" to "pointer to
> array[16] of const char" rather than to "pointer to const array[16] of
> char", by virtue of the requirement (6.7.3#8 in C99) that a type qualifier
> applied to an array type applies instead to the element type. Thus the
> case of 6.5.16.1#1 that would be matched in the case of pointers to
> nonarray types adding qualifiers is not matched, thus the warning.
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