Build error when setting upload.maximum_size or upload.maximum_data_size properties in hexadecimal format

[fronders]

Describe the problem

When the boards.txt definition contains either {upload.maximum_size} or {upload.maximum_data_size} as hex values instead of decimal the build fails with error:

Using library ArduinoJson at version 6.21.4 in folder: C:\Users\xxx\Arduino\libraries\ArduinoJson 
Using library SrcWrapper at version 1.0.1 in folder: C:\Users\xxx\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\libraries\SrcWrapper 
Error during build: strconv.Atoi: parsing "0x20000": invalid syntax

Used library                            Version Path
SparkFun u-blox SARA-R5 Arduino Library 1.1.9   C:\Users\xxx\Repo\tacoman\SparkFun_u-blox_SARA-R5_Arduino_Library
SoftwareSerial                          1.0.0   C:\Users\xxx\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\libraries\SoftwareSerial
ArduinoUniqueID                         1.3.0   C:\Users\xxx\Arduino\libraries\ArduinoUniqueID
STM32duino RTC                          1.4.0   C:\Users\xxx\Arduino\libraries\STM32duino_RTC
ArduinoJson                             6.21.4  C:\Users\xxx\Arduino\libraries\ArduinoJson
SrcWrapper                              1.0.1   C:\Users\xxx\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1\libraries\SrcWrapper

Used platform            Version Path
CustomBoard:stm32      1.0.0   C:\Users\xxx\Arduino\hardware\CustomBoard\stm32
STMicroelectronics:stm32 2.7.1   C:\Users\xxx\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.7.1
IntelliSense configuration already up to date. To manually rebuild your IntelliSense configuration run "Ctrl+Alt+I"
[Error] Verifying sketch 'main.ino': Exit with code=1

To reproduce

Edit boards.txt entry to set {upload.maximum_size} or {upload.maximum_data_size} to a hex value i.e. 0x20000 instead of 131072

[......]
BOARD_ID.upload.maximum_size=0x20000
[......]

Expected behavior

Hexadecimal property values when prefixed with 0x should be parsed normally just like the {build.flash_offset} property is.

Arduino CLI version

nightly-20240131 Commit: 205a6a5 Date: 2024-01-31T01:27:13Z

Operating system

Windows

Operating system version

10.0.19045 Build 19045

Additional context

arduino-cli.exe is run from VSCode using Microsoft's Arduino extension: vsciot-vscode.vscode-arduino

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details

[alessio-perugini]

👋 currently we're giving support only to decimal values. As you can see here: https://github.com/arduino/arduino-cli/blob/master/internal/arduino/builder/sizer.go#L138-L149
https://github.com/arduino/arduino-cli/blob/master/internal/arduino/builder/sketch.go#L254

We can add support for that, but I cannot guarantee you when as we're considering this is a low priority. If you're willing to make a PR we'll be more than happy the review it.