Erik Trulsson wrote: > On Wed, Jan 28, 2009 at 04:39:39PM +0000, Andrew Haley wrote:
>> "6.3.2.3 Pointers >> >> If a null pointer constant is converted to a pointer type, the >> resulting pointer, called a null pointer, is guaranteed to compare >> unequal to a pointer to any object or function." >> >> This implies that a linker cannot place an object at address zero. > > Wrong. There is nothing which requires a null pointer to be all-bits-zero > (even though that is by far the most common representation of null > pointers.) We're talking about gcc on ARM. gcc on ARM uses 0 for the null pointer constant, therefore a linker cannot place an object at address zero. All the rest is irrelevant. Andrew.
