"Canonical" way of changing the size of off_t, ino_t, ...

[Brian Inglis]

On 2025-04-27 10:27, Stefan Heinzmann wrote:
> Hello list,
> 
> I am using the newlib build for arm-none-eabi from ArchLinux for simplicity, but 
> I now need to change the size of some predefined POSIX types. I wasn't able to 
> find clear instructions how to do this properly, hence my question here.
> 
> The default sizes of offs_t, ino_t, and possibly other types are too small for 
> my use. Ideally I would like to customize the newlib build in a way that doesn't 
> require the user builds to define anything, i.e. that the correct sizes are 
> picked up from the newlib headers automatically. How do I do that? Are there 
> configuration options I can use when building newlib? Do I have to patch the 
> source, and if so, where?
> 
> I note that there is support for off64_t and the respective functions, but I 
> would prefer to have off_t defined as 64-bit, in a way similar to 
> _FILE_OFFSET_BITS=64 in glibc.
> 
> Similarly, how do I make ino_t larger? What about dev_t, and other POSIX types?
> 
> Thanks for your help!

Please first read the FAQ, and follow all the steps, but ensure that you do not 
redefine anything provided or assumed by your compiler or binutils:

	https://www.sourceware.org/newlib/faq.html

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry