fxdmhtt opened a new issue, #3124:
URL: https://github.com/apache/nuttx-apps/issues/3124
### Description / Steps to reproduce the issue
```bash
make distclean
./tools/configure.sh -l sim:lvgl_fb
kconfig-tweak --enable CONFIG_GRAPHICS_LVGL
kconfig-tweak --enable CONFIG_EXAMPLES_LVGLDEMO
kconfig-tweak --enable CONFIG_LV_USE_NUTTX
kconfig-tweak --disable CONFIG_DEBUG_FULLOPT
kconfig-tweak --enable CONFIG_DEBUG_SCHED
kconfig-tweak --enable CONFIG_DEBUG_SCHED_ERROR
kconfig-tweak --enable CONFIG_SCHED_BACKTRACE
kconfig-tweak --enable CONFIG_FRAME_POINTER
kconfig-tweak --enable CONFIG_PIPES
kconfig-tweak --enable CONFIG_LIBUV
kconfig-tweak --set-val CONFIG_TLS_TASK_NELEM 16
kconfig-tweak --disable CONFIG_DISABLE_ENVIRON
kconfig-tweak --enable CONFIG_LV_USE_NUTTX_LIBUV
make olddefconfig
make -j8
```
This will report:
```
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:
In function ‘lv_nuttx_run’:
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:180:23:
error: ‘ui_loop’ undeclared (first use in this function)
180 | lv_nuttx_uv_loop(&ui_loop, result);
| ^~~~~~~
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:180:23:
note: each undeclared identifier is reported only once for each function it
appears in
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:180:5:
error: too many arguments to function ‘lv_nuttx_uv_loop’
180 | lv_nuttx_uv_loop(&ui_loop, result);
| ^~~~~~~~~~~~~~~~
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:52:17:
note: declared here
52 | static void lv_nuttx_uv_loop(lv_nuttx_result_t * result);
| ^~~~~~~~~~~~~~~~
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:
In function ‘lv_nuttx_uv_loop’:
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:273:5:
error: unknown type name ‘uv_loop_t ’
273 | uv_loop_t loop;
| ^~~~~~~~~
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:277:5:
warning: implicit declaration of function ‘uv_loop_init’; did you mean
‘lv_ll_init’? [-Wimplicit-function-declaration]
277 | uv_loop_init(&loop);
| ^~~~~~~~~~~~
| lv_ll_init
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:288:5:
warning: implicit declaration of function ‘uv_run’
[-Wimplicit-function-declaration]
288 | uv_run(loop, UV_RUN_DEFAULT);
| ^~~~~~
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c:288:18:
error: ‘UV_RUN_DEFAULT’ undeclared (first use in this function); did you mean
‘LV_FONT_DEFAULT’?
288 | uv_run(loop, UV_RUN_DEFAULT);
| ^~~~~~~~~~~~~~
| LV_FONT_DEFAULT
make[2]: *** [/root/nuttxspace/apps/Application.mk:239:
/root/nuttxspace/apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_entry.c.root.nuttxspace.apps.graphics.lvgl.o]
Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [Makefile:54: /root/nuttxspace/apps/graphics/lvgl_all] Error 2
make: *** [tools/LibTargets.mk:248: /root/nuttxspace/apps/libapps.a] Error 2
```
This is normal, because `apps/examples/lvgldemo/lvgldemo.c` depends on
uv_loop_init
https://github.com/apache/nuttx-apps/blob/0c680bcb8e011fcab1d6473da0f175348e75ceb0/examples/lvgldemo/lvgldemo.c#L76
and uv_loop_init in `apps/system/libuv/libuv/src/unix/loop.c` also depends
on uv__process_init
https://github.com/libuv/libuv/blob/612a8262b840a1d104afcd9c45b2b88cde6b9e6d/src/unix/loop.c#L85
but uv__process_init exists in `apps/system/libuv/libuv/src/unix/process.c`
and it is not in the `apps/system/libuv/Makefile` file.
Of course, there shouldn't be, since NuttX doesn't have a process model.
In fact, manually adding process.c to the compilation would introduce more
problems.
So, what's the idea? Is libuv actually usable?
### On which OS does this issue occur?
[OS: Linux]
### What is the version of your OS?
Ubuntu 24.04 LTS
### NuttX Version
master
### Issue Architecture
[Arch: simulator]
### Issue Area
[Area: Examples]
### Host information
_No response_
### Verification
- [x] I have verified before submitting the report.
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