warning when converting from non-const to const pointer type

[Agthorr <agthorr at barsoom dot org>]

I found a case where gcc does not automatically cast from "a pointer
to non-const data" to "a pointer to const data", where the data is
otherwise of the same type.  Instead, it complains that the pointers
are of incompatible pointer types.

-- Dan Stutzbach

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Reading specs from
/usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/specs
gcc version 2.95.2 19991024 (release)
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gcc -Wall -W -c test.i -o test
test.c: In function `main':
test.c:10: warning: passing arg 1 of `egg' from incompatible pointer type
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typedef char beep[3];

void egg (const beep *meow);

int main (void)
{
    beep *meow = 0;
    egg (meow);
    return 0;
}
------------------------------------------------------------------------