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This repository was archived by the owner on Sep 19, 2026. It is now read-only.
Figure out how to properly support picolibc (IDF 6.0+) #410
Description
IDF 6.0+ adds support for picolibc, and makes it the default (instead of newlib)
picolibc appears to be mostly compatible with newlib, apart from a few file-related macros that are defined differently:
E (351) libc_checks: Mismatch detected for constant `O_APPEND`: `esp-idf` 1024 | `libc` 8
E (351) libc_checks: Mismatch detected for constant `O_CREAT`: `esp-idf` 64 | `libc` 512
E (361) libc_checks: Mismatch detected for constant `O_TRUNC`: `esp-idf` 512 | `libc` 1024
See thread here for all the details: #408 (comment)
- We'll need to submit a patch to upstream
libcno matter what (I have something semi-temporary, see above) - We need to figure out how to support this in
esp-rs, maybe a separate set of toolchain, maybe just a cfg flag that needs to be passed?
Activity
drinkcat commentedon Mar 31, 2026
libc PR: rust-lang/libc#5035
drinkcat commentedon Mar 31, 2026
@SergioGasquez FYI, related to my libc-checks PR.
Somehow related... Should we think about merging libc-checks into this repo?! Might be worth adding to CI here (even though it's not testing much of esp-idf-sys itself, technically)
ivmarkov commentedon Mar 31, 2026
I'm all for that, actually, but let's avoid any big moves like shuffling the existing
esp-idf-syslayout. :-)How about we just re-implement
libc-checksas an example?ivmarkov commentedon Sep 15, 2026
I think this is already addressed so we should close.