Compiler Flags

[sstaub]

Is there a way to set compiler flags like -Wall ...?
Maybe an option field in preferences would helpfull.
Also please open a discussion forum for simple questions.

[per1234]

like -Wall

In the specific case of -Wall, yes. This is typically achieved by setting the File > Preferences > Compiler warnings setting to "More" or "All".

Here is an example of how it is configured in the "Arduino AVR Boards" platform:
https://github.com/arduino/ArduinoCore-avr/blob/1.8.3/platform.txt#L17-L18
Each boards platform author is free to set arbitrary compiler flags, but this is the most common configuration.

Also please open a discussion forum for simple questions.

We already have one:
https://forum.arduino.cc/c/software/arduino-ide-2-0-beta/93

[plapointe6]

Being able to specify project-specific build flags would be a great functionnality. I have seen many persons trying to do this on the internet. The current workaround of redefining board specificly for this is less than ideal.