Language server error related to generated compilerPath in c_cpp_properties.json for esp8266/Arduino

[milanbx]

Problem

After upgrading ESP8266/Arduino core to v3.1.1, the Arduino extension regenerated th c_cpp_properties.json file with a compilerPath attribute having value causing following C/C++ configuration error:
Unable to resolve configuration with compilerPath: "@D:\Portable\Arduino\portable\packages\esp8266\hardware\esp8266\3.1.1\tools\warnings\default-g++"
On top of this line from C/C++ Configuration Warning output, the Code UI shows 5 instances of cpptools output windows, all having same content (see also snapshot below):
[Error - 18:20:27] Connection to server got closed. Server will not be restarted.

Then, the intellisense stops working at all, no cross reference can be followed (Ctrl+left mouse click) to see details of function or variable declaration etc.

Environment

Code

Version: 1.74.3
Commit: 97dec172d3256f8ca4bfb2143f3f76b503ca0534
Date: 2023-01-09T16:59:02.252Z
Electron: 19.1.8
Chromium: 102.0.5005.167
Node.js: 16.14.2
V8: 10.2.154.15-electron.0
OS: Windows_NT x64 10.0.19045
Sandboxed: No

Code Extensions

Arduino: 0.4.12
C/C++ Extension Pack: 1.3.0

Steps to reproduce

Just run VS Code, open any sketch with Arduino code (*.ino), even empty one. Popup error start to come up in the lower right corner - see snapshot:

Code snippet

Every, does not matter, even this simple blinking LED example:

byte go = LOW;
void setup() {
    pinMode(LED_BUILTIN, OUTPUT);
    digitalWrite(LED_BUILTIN, go);
}
void loop() {
    delay(500);
    go = 1 - go;
    digitalWrite(LED_BUILTIN, go);
}

Code Dev Tools Console Log

see attached file please
vscode-app-1673804966418.log

[milanbx]

I have used vanilla Code portable installation v1.74.3 with only Arduino extension, which requires C/C++ extension v1.13.9, without ESP8266 or any other aditional board, and empty sketch configured for Arduino Uno (on Windows 11), and the bug did not appear any more. It meand, the bug has to do something with ESP8266 Arduino core.

[chibidev]

ESP8266 Arduino core changed how it handles compiler warnings with esp8266/Arduino#8495 (released in probably 3.1.0), which resulted in vscode's compiler output parser to pick up the wrong path for the compiler. esp8266/Arduino#8829 fixes that, hopefully we get a release soon.

Until then, a temporary fix might be to rename each file ending in -g++ and -gcc to something else (e.g. extra-g++ -> extra-cpp and alike). Don't forget to change platform.txt as well.