On 2025-01-31 17:34:48, raiden00pl wrote: > How do you want to maintain compatibility between nuttx-apps and > nuttx while both are active development projects, and what's more > one of them is optional? It's not possible. Same way as app/kernel compatibility is maintained in othes Unices like Linux or BSD.
> It would be possible if we assumed that the API in NuttX is perfect > and will not require changes, which is not true. There are many custom > solutions in NuttX that require improvements and these improvements > will break compatibility. There are many custom interfaces that need > improvement, such as PWM or sensors, and these changes will > definitely break apps. No, just be super careful designing API to "userspace" and once commited it stays. Forever. Bad APIs will remain. Posix does not remove bad APIs as well. That's why we still have "creat" instead of "create". Or we have 3 poll APIs in Linux (select/poll/epoll). You really want to change API, you build another one, and mark old one as deprecated, but you don't delete it. That would be ok if Nuttx was <1.0.0, version, but it's >=1.0.0 so it should care about API/ABI. Especially that it does not have to come up with API and just use what Posix been using for decades now. > On the other hand, any standardized interface like POSIX must be stable, > which is obvious. But POSIX doesn't define everything, especially when > it comes to embedded systems. So you carefully define it, keep it as EXPERIMENTAL for some time, which allows for breaking changes, but once API is marked as stable - it is set in stone. Period. -- .-----------------.-------------------.----------------------.-----------------. | Michal Lyszczek | Embedded C, Linux | Company Address | .-. opensource | | +48 727 564 419 | Software Engineer | Akacjowa 10a; 55-330 | oo| supporter | | https://bofc.pl `----.--------------: Brzezinka Sredzka PL | /`'\ & | | GPG FF1EBFE7E3A974B1 | Bits of Code | NIP: 813 349 58 78 |(\_;/) programer | `----------------------^--------------^----------------------^-----------------'
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