On Tue, Feb 16, 2016 at 11:10:08PM +0000, Joseph Myers wrote: > It sets it to be null - but does it diagnose conversion from integer to > pointer without a cast (it should do so if __array_size is not evaluating > to an integer constant expression, but not if it is evaluating to an > integer constant expression - hence this being one way to test whether > the result is an integer constant expression)?
With -Wall -Wextra, I do not see any such warning. IIUC, the warning would be given by -Wint-conversion, included in -Wall. FWIW, if I use "int a=1; void *p=a-a;" I do get the expected warning, so I think that covers this case. Is this right? If I use __array_size in an enumeration, this works fine, rather than giving me "error: enumerator value for ‘foo’ is not an integer constant". I am not sure if this is not also a valid test. -- Many thanks, Stuart Brady
