Build failure with newer GCC: unterminated string literal in mpy-cross compilation

[gerogebubl]

G’day,

I’ve used this LVGL+micropython script many times since I last got your help, and had no issues each time, with a variety of different boards. But this time, I ended up having this issue every time I tried to build, on both my desktop and laptop.

I spent some time trying to get this working (though I don’t really understand the issue), and eventually ended up adding “CWARN += -Wno-unterminated-string-initialization“ to the previously generated mpy-cross Makefile. After making this change, I was able to build and deploy to my board successfully.

I was apprehensive about whether I should mention this, as I don’t want to waste your time if it’s something intrinsic to my system, and thus not something others are likely to face; but from my meager understanding, it seems as though this could be an issue that others are likely to run into, so I figured I would share just in case.

The command I used (amongst variations) which failed repeatedly, until I made the aforementioned changes was:
"python3 make.py esp32 BOARD=ESP32_GENERIC_S3 BOARD_VARIANT=SPIRAM_OCT"

The error I was getting was:

../py/emitinlinethumb.c:434:13: error: initializer-string for array of ‘char’ truncates NUL terminator but destination lacks ‘nonstring’ attribute (4 chars into 3 available) [-Werror=unterminated-string-initialization]
434 |     { 0x80, "div" },
|             ^~~~~
See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
make: Leaving directory '/mnt/nas/Documents/Uni/2025_Trimester_2/Final_Project/jul2025/lvgl_micropython/lib/micropython/mpy-cross'
cc1: all warnings being treated as errors
make: *** [../py/mkrules.mk:101: build/py/emitinlinethumb.o] Error 1

My gcc version is: 15.1.1 20250425

I am on manjaro (Linux 6.6.99-1-MANJARO)

Thanks heaps for the great work you continue to put into this project.