Re: warning: comparison between signed and unsigned integer expressions

On Mon, 19 Apr 2010 14:21:42 -0700, SD <macosxdevlist-LS+HbC+WUqxt2bImrQXijVaTQe2KTcn/@public.gmane.org> asks: 

> How do people normally handle the comparison between signed and 
> unsigned integers?  I have cross platform code (Mac and Windows and 
> 32 bit and 64 bit compilations). 

With correct typing, or with casting.   

With C, promotion of an unsigned can end up as a signed value or as an unsigned value, depending on the value being promoted.  
Have a look around for the value-preserving and unsigned-preserving discussions; current C tends to be value-preserving.

Depending on how cross-platform your cross-platform code is, another issue that can occur is endianness.  
Mac OS X Intel is little-endian and PPC is big-endian.  Windows is little-endian.  HP-UX and SPARC are big-endian.

Requesting diagnostics for portability and standards-compliance and questionable code can be a good idea, too.