On Tue, Sep 16, 2014 at 10:17:18AM +0800, Fengguang Wu wrote:
> I could disable this warning in my reports, but CC sparse authors
> first to check if there are more elegant solutions.
int main(void)
{
printf("%x\n", (unsigned short)~(0xc00)); // <-- ok
printf("%x\n", (unsigned short)~(0xc000)); // <-- complains
return 0;
}
test.c:10:40: warning: cast truncates bits from constant value (ffff3fff becomes 3fff)
The reason the first one is ok is because we don't complain if the
truncated bits are purely sign bits. I feel like it should apply to the
second statement as well. If we're only masking out 0xffff then don't
complain.
regards,
dan carpenter
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