GitHub

error: '::printf', '::sprintf', '::vprintf' has not been declared for ESP8266

I am using an apparently Arduino compatible ESP8266 module (https://github.com/esp8266/Arduino). When building with this library I get the following error message: In ...
note

PICでprintf()を使う

PICのコードの動作確認のためにコード中にprintfを書いてパソコンの通信ソフトウェアでその内容を受信する方法です。ArduinoではSerialPortの設定をしてArduino IDEのターミナルで簡単にできます。とても便利なのでPICでも同じことがやりたかっただけです。
GitHub

Implement printf/puts workaround that does not rely on undefined behavior

I suspect the mpaland approach to the definitions resulted in printf_ being used as the actual name instead of printf w/ the Aliasing option, which avoided the optimization in the past. One workaround ...
Hackaday

Using Printf-style Output To Debug Arduino

First off, if you’re looking at that title and thinking it’s flame-bait, please hold off. What [Ihsan Kehribar] is working with is another way to get some feedback for what’s going on with your ...