[LVGL] When `Flow support` is enabled, errors occur in `ui.h` and `ui.c`

[SinglWolf]

When Flow support is enabled, errors occur in ui.h and ui.c
In ui.h:

Why use this incomprehensible construction

#if !defined(EEZ_FOR_LVGL)
#warning "EEZ_FOR_LVGL is not enabled"
#define EEZ_FOR_LVGL
#endif

when you can just add

#include <eez-framework.h>

In ui.c:
Including on the header file does not work

#include <eez/core/vars.h>

A working variant

#include "ui.h"
#if defined(EEZ_FOR_LVGL)
#include <eez/core/vars.h>
#endif

[mvladic]

If you are using eez-framework library, to prevent warning "EEZ_FOR_LVGL is not enabled" you need to add -DEEZ_FOR_LVGL to your compiler build command. But, I recommend to enable "Generate source code for EEZ flow engine (eez-framework)" option in Settings - Build (it is enabled by default when creating a new project), because in that case you don't need to link with eez-framework library.

[SinglWolf]

If you are using eez-framework library, to prevent warning "EEZ_FOR_LVGL is not enabled" you need to add -DEEZ_FOR_LVGL to your compiler build command.

But why should I make changes to the compilation settings of my project if the solution I have proposed allows it to work out of the box?

I recommend to enable "Generate source code for EEZ flow engine (eez-framework)" option in Settings - Build (it is enabled by default when creating a new project), because in that case you don't need to link with eez-framework library.

Your recommendations certainly make sense. In my project, I use arduino-ESP32 as a component of the ESP-IDF framework. The problem is described in eez-open/eez-framework#22
It's easier for me to set up the eez-framework as an esp-idf component once and forget than to edit "CMakeLists.txt " in the main project directory and configure the eez-framework files via idf_component_register.

[mvladic]

If eez-framework library is used inside LVGL project then EEZ_FOR_LVGL must be defined so this warning stays.

[SinglWolf]

If eez-framework library is used inside LVGL project then EEZ_FOR_LVGL must be defined so this warning stays.

Then need to do this:

#if ARDUINO
#include <eez-framework.h>
#else
#if !defined(EEZ_FOR_LVGL)
#warning "EEZ_FOR_LVGL is not enabled"
#define EEZ_FOR_LVGL
#endif

[mvladic]

Your recommendations certainly make sense. In my project, I use arduino-ESP32 as a component of the ESP-IDF framework. The problem is described in eez-open/eez-framework#22
It's easier for me to set up the eez-framework as an esp-idf component once and forget than to edit "CMakeLists.txt " in the main project directory and configure the eez-framework files via idf_component_register.

My recommendation is to use "Generate source code for EEZ flow engine (eez-framework)" and remove "eez-framework" from the esp-idf component dependencies - it is so much less hassle.