undefined reference to `lv_demo_widgets

[ChrisVonFrosta]

Hi. i still playing around. i got working you esp32-smartdisplay_demo working but the display image builds up slowly (running n the 7" version). So i want to try the LVGL demo but i can't run lvgl_demo_widgets
I activated #define LV_USE_DEMO_WIDGETS 1 in lv_conf.h.
i included demos/widgets/lv_demo_widgets.h.

I tried alot. added explicit paths for inludes files to plattformio.ini. tried with copys of demo files in serveral folders.
I added compiler warnings to the parts of inlcude files to see if the files are procceded/inlcuded.
All inlcuded fine.

But i got always this error:
undefined reference to lv_demo_widgets'`

if i comment out the lv_demo_widgets(); all compile fine.

I am searching for hours an become crazy.
Thank you

[rzeldent]

Hi Chris,

I think this requires also compiling the source code in LVGL for the demo.