Unicode (non-ASCII) identifiers support

[liuxilu]

Describe the request

bool 我;

Describe the current behavior

Compilation error: stray '\346' in program

Arduino IDE version

nightly-20241212

Operating system

Windows, N/A

Operating system version

N/A

Additional context

Update to GCC 10 may work
GCC 10 Changes

Extended characters in identifiers may now be specified directly in the input encoding (UTF-8, by default), in addition to the UCN syntax (\uNNNN or \UNNNNNNNN) that is already supported:
static const int π = 3;
int get_naïve_pi() {
return π;
}

Issue checklist

• I searched for previous requests in the issue tracker
• I verified the feature was still missing when using the latest nightly build
• My request contains all necessary details

[per1234]

Hi @liuxilu. As you indicated, support or lack of support for non-ASCII identifiers is up to the compiler. Arduino IDE simply installs and uses whichever compiler the boards platform specifies. If the platform specifies a version of GCC that supports non-ASCII identifiers, then they will be supported, without any changes needed in Arduino IDE to allow such support. In fact, you will find that some boards platforms already do use such versions of GCC. For example, try compiling your code for a board from the latest version of the "esp32" boards platform.

So I will close this as off topic for this repository. You can submit requests for compiler version updates to the issue trackers of the individual Arduino boards platforms platforms. We already have such requests in official boards platforms:

• Please support C++17 by default ArduinoCore-avr#435
• Upgrade gcc toolchain version ArduinoCore-sam#112
• Another toolchain update request thread. ArduinoCore-samd#627
• [Feature Request] Provide a much more up-to-date compiler (at least GCC 12) ArduinoCore-renesas#149

[liuxilu]

Thank you for pointing out.