Set standard c++ version to 17 instead of 11

[FredM67]

In the file "platform.txt", replace "-std=gnu++11" with "-std=gnu++17" to support the latest features of C++.

[per1234]

Hi @FredM67. Thanks for your interest in this open source project.

This repository contains the code for the Arduino IDE. There is no platform.txt here, only the code for a GUI. The author of each boards platform can chose to use any compiler compiler flags they like, so the Arduino IDE has no influence over which C++ standard is used for a given board.

[Ebola-Chan-bot]

Hi @FredM67. Thanks for your interest in this open source project.

This repository contains the code for the Arduino IDE. There is no platform.txt here, only the code for a GUI. The author of each boards platform can chose to use any compiler compiler flags they like, so the Arduino IDE has no influence over which C++ standard is used for a given board.

So which repository contains that? Or how can I contact the author of a board platform?

[per1234]

which repository contains that?

There are multiple repositories. It depends on which board you are using. You can see a fairly comprehensive list here:
https://github.com/per1234/ino-hardware-package-list/blob/master/ino-hardware-package-list.tsv

[FredM67]

That should be at least this one:
https://github.com/arduino/ArduinoCore-avr