Improper warning when casting from pointer to non-const array to const
>Submitter-Id: net
>Originator: agthorr@barsoom.org
>Organization: The Debian Project
>Confidential: no
>Synopsis:
>Severity: non-critical
>Priority: low
>Category: c
>Class: change-request
>Release: 3.2.1 (Debian) (Debian unstable)
>Environment:
System: Debian GNU/Linux (unstable)
Architecture: i686
host: i386-linux
Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,proto,pascal,objc,ada --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-gxx-include-dir=/usr/include/c++/3.2 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --enable-__cxa_atexit --enable-clocale=gnu --enable-java-gc=boehm --enable-objc-gc i386-linux
Thread model: posix
gcc version 3.2.2 20021212 (Debian prerelease)
>Description:
[ Reported to the Debian BTS as report #126411.
Please CC 126411@bugs.debian.org on replies.
Log of report can be found at http://bugs.debian.org/126411 ]
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 occurs in gcc 2.95.x upto gcc-3_3-branch, no check on HEAD
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 ;)
typedef char foo[16];
void bar (const foo *xyzzy)
{}
int main(void)
{
foo bozz;
bar (&bozz);
return 0;
}
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