On Sat, 2009-08-15 at 12:04 +0200, Michael Buesch wrote:
> I still do not understand why it does complain about an _explicit_ truncation.
> That's simply stupid. If I program an explicit truncation I _do_ mean to truncate the value.
Actually, it's a bug in sparse. Sparse acts inconsistently.
This causes a warning:
void mask(unsigned short mask);
static void test(void)
{
mask((unsigned short)0xffff0000);
}
test.c:4:30: warning: cast truncates bits from constant value (ffff0000
becomes 0)
But this is OK:
void mask(unsigned short mask);
static void test(void)
{
mask((unsigned short)0xfffff000);
}
Moreover, this is OK, even though the cast changes the value of the
constant:
void mask(unsigned short mask);
static void test(void)
{
mask((unsigned short)0xfffff000U);
}
I suggest that we take no action until sparse is fixed. I'm going to
report the issue to the sparse mailing list now.
--
Regards,
Pavel Roskin
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