Thank you for your response. I want to make sure that my code snippets, if they are compiled and run on a machine with 16-bit int, still works. I don't have access to such a machine, so I want to compile and run them with 16-bit int on my machine that defaults to 32-bit int. Especially the intermediate results' size are interesting. What happens if they are truncated to 16-bit? There will not be any problem with library compatibility. BR /göran -----Original Message----- From: David Brown [mailto:david@xxxxxxxxxxxxxxx] Sent: den 9 augusti 2012 15:37 To: Göran Steen Cc: gcc-help@xxxxxxxxxxx Subject: Re: 16-bit int On 09/08/2012 13:26, Göran Steen wrote: > Hi! > > I use gcc version 4.3.4, where int is 32-bit variables. Is it possible > to setup compiler to compile int as 16-bit variables? > > With best regards / Med vänlig hälsning / Mit freundlichen Grüßen / > Saudações > > Göran Steen The size of an int depends on the target - gcc supports dozens of targets. Most have 32-bit ints, but some have 16-bit ints and at least one has a compile-time option to support 8-bit ints (though that goes against C standards, and is deprecated on current builds). There are probably also targets with 64-bit ints. So step one in asking for help here is to tell us your target. Step two is to tell us what you are hoping to achieve. Almost certainly, there is no way to change the int size - and even if there happens to be a command-line switch for the given target, it is probably not a good idea (you'll get in a horrible mess with library compatibility, for example). And even if it is possible, it is highly unlikely to be advantageous. Tell us what you really want to achieve here, and people can give you advice towards that. mvh., David
