Hi, maybe providing a (pseudo-)module with an advanced `printf()` version would be a solution? That way people actually needing full support can have it, without the ROM / RAM cost being paid by everyone. However, I'm not sure if one can pick the non-nano stdio from newlib while everything else remains "nano" flavor. (E.g. the non-nano malloc implementation can cause issues when working with non-contiguous memory regions, so just switching to the non-nano newlib via a pseudo module might be more involved.)
One could of course provide a fully distinct `printf()` implementation (e.g. based on the avrlibc) as module in source and use some linker magic to link calls to `printf()` to the custom implementation. I think it would be possible to provide `printf()` with both %llu / %lld support and lower RAM / ROM consumption compared to newlib's implementation. I bet nobody would complain about extra printf() features, if they end up coming with a lower RAM/ROM consumption; so this might end up becoming the default option for newlib based platforms. While I like the idea of this, I sadly don't have the time to PR this; at least not now. But maybe someone else wants to do so? Kind regards, Marian On Tue, 28 Jul 2020 16:05:41 +0300 Lars Eggert <l...@eggert.org> wrote: > Hi, > > On 2020-7-28, at 15:48, Marian Buschsieweke <marian.buschsiew...@ovgu.de> > wrote: > > you can use print_u64_dec() [1] instead, which is provided by the module fmt > > (USEMODULE += fmt). > > thanks for the pointer! But the fmt module doesn't seem to have a > printf/vprintf-style interface with format strings? (The logging > functionality that I am trying to get to run is built around that.) > > > The lack of 64 bit support is deliberate and consistent with other > > platforms, > > as full stdio compatibility is quite expensive in terms of ROM and RAM > > consumption. > > Understood. And I wouldn't really care if the ESP32 didn't crash when its > printf encounters a 64-bit format string... > > Thanks, > Lars
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