I have used lv_port_linux_frame_buffer’s demo to create my project in Linux system.Unfortunately, the executable file I compiled is so large.I have tried to turn off the log, file system, themes and some wigets. Only the wigets needed for the demo are left.But, The executable file size is over 250 kb;
What MCU/Processor/Board and compiler are you using?
Arm
What LVGL version are you using?
using 7.4.0
What do you want to achieve?
How to cut lvgl so that the size of the compiled executable file is less than 100kb?
Linux executables are generally larger than the equivalent bare-metal program. As an example, an program with oneprintf("Hello\n") statement requires 8 kilobytes when compiled for Arm Linux.
You could try using <toolchain prefix>-nm --print-size --size-sort <executable> to find out what parts of the code are taking up so much space.
I tried it and the result is
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address size section name
========|========|=|============
0001ca68 00003d74 T lv_draw_rect
Your concern is executable size so you’re looking for entries with a section of T or t (.text) or r (.rodata).
When you pass --size-sort to nm, it sorts the entries from smallest to largest, thus you should start at the bottom of the list and work your way up.
Unfortunately I’m not seeing anything particularly large in your output (you could enable LV_SPRINTF_CUSTOM to save a few KB and use Linux’s built-in implementation).
Another thing you can try is running strip --strip-debug --strip-unneeded <executable>. This will remove some of the bloat that comes from a Linux ELF file (as opposed to a bare-metal binary).