ESP32 Forum

Posted: **Mon Oct 16, 2023 2:20 am**

Hi everyone, I'v been trying to use a faster alternative to sprintf and came across the fmt library, which can be added as a component from here: https://components.espressif.com/compon ... ressif/fmt

I haven't been able to compile the code; I seem to be missing some libraries:

Code: [Select all] [Expand/Collapse]

In file included from /projects/analog_read/one_shot_ADC/main/one_shot_ADC.c:15:
/projects/analog_read/one_shot_ADC/managed_components/espressif__fmt/fmt/include/fmt/format.h:36:10: fatal error: cmath: No such file or directory
   36 | #include <cmath>             // std::signbit
      |          ^~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.

GeSHi © Codebox Plus Extension

Currently I'm using ESP-IDF v5.2-dev-823-g903af13e84-dirty

I don't know whether these libraries should be included in ESP-IDF or should come with my linux distribution.

Thanks

Posted: **Mon Oct 16, 2023 3:32 am**

fmt is a c++ library. If you compile a file with a .c extension, esp-idf will use the C compiler to compile it, which doesn't understand c++. You can try to rename the file that uses fmt from bla.c to bla.cpp, but notice that there may be differences between C++ and C you can get caught in.

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