NCS 3.0.0: Linker errors when building LVGL project

Question

Dear DevZone, 
 While porting our project from NCS 2.9.1 to NCS 3.0.0, I ran into linker errors when building LVGL. The linker reports that it cannot find functions defined in C:
cs\v3.0.0\modules\lib\gui\lvgl\src\misc\lv_circle_buf.c. It appears that this file is not included in C:
cs\v3.0.0\zephyr\modules\lvgl\CMakeLists.txt. After manually adding ${LVGL_DIR}/src/misc/lv_circle_buf.c to zephyr_library_sources() to that file, I was able to build the project without any linker errors. 
 Is this a bug or am I doing something wrong? 
 Thanks, 
 Ladivin

jakkra · Answer

I have the exact same issue, however only when putting LVGL into external XIP flash using: 
 
 zephyr_code_relocate(LIBRARY modules__lvgl LOCATION EXTFLASH_TEXT NOCOPY) 
 zephyr_code_relocate(LIBRARY modules__lvgl LOCATION RAM_DATA) 
 
 Did you find any hints? Must be something related. It worked in 2.9.1 for me. 
 
 Adding 
 
 zephyr_library_sources( ${LVGL_ROOT_DIR} /src/misc/lv_circle_buf.c) in modules/lib/gui/lvgl/env_support/cmake/zephyr.cmake did not make any difference.

arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lvgl/libmodules__lvgl.a(lv_iter.c.obj): in function `lv_iter_destroy':
modules/lib/gui/lvgl/src/misc/lv_iter.c:98: undefined reference to `lv_circle_buf_destroy'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lvgl/libmodules__lvgl.a(lv_iter.c.obj): in function `lv_iter_make_peekable':
modules/lib/gui/lvgl/src/misc/lv_iter.c:112: undefined reference to `lv_circle_buf_create'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lvgl/libmodules__lvgl.a(lv_iter.c.obj): in function `lv_iter_next':
modules/lib/gui/lvgl/src/misc/lv_iter.c:122: undefined reference to `lv_circle_buf_is_empty'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lib/gui/lvgl/src/misc/lv_iter.c:123: undefined reference to `lv_circle_buf_read'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lib/gui/lvgl/src/misc/lv_iter.c:124: undefined reference to `lv_circle_buf_skip'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lvgl/libmodules__lvgl.a(lv_iter.c.obj): in function `lv_iter_peek':
modules/lib/gui/lvgl/src/misc/lv_iter.c:145: undefined reference to `lv_circle_buf_size'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lib/gui/lvgl/src/misc/lv_iter.c:148: undefined reference to `lv_circle_buf_fill'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lib/gui/lvgl/src/misc/lv_iter.c:152: undefined reference to `lv_circle_buf_peek_at'
arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: modules/lvgl/libmodules__lvgl.a(lv_iter.c.obj): in function `lv_iter_peek_advance':
modules/lib/gui/lvgl/src/misc/lv_iter.c:162: undefined reference to `lv_circle_buf_capacity'

Edit: Found the issue, the file is missing in this file zephyr/modules/lvgl/CMakeLists.txt 
 I was also adding the zephyr_library_sources to the wrong cmake file, did it in the one zephyr.cmake inside lvgl, which is not the one used. 
 It's added in this upstream commit: https://github.com/zephyrproject-rtos/zephyr/commit/0b0fd7d674f67a358eb9532ea2b26b8493235bcb