Bug#126411: gcc-3.0: Improper warning when casting from pointer to non-const array to const

[Agthorr <agthorr@barsoom.org>]

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.