Undefined reference to `app_main'

Development Platforms
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1

When trying to create a blank project, I always get undefined reference to 'app_main'. When I select Arduino as framework it works but not with idf. Maybe it is because of the new idf 5.X version? If yes, how to change that during project setup?

2

Can you pload your project files? (Without .pio folder)

3

Using VS Code Version: 1.80.1 (Universal)
Platformio: Core 6.1.9 Home 3.4.4

4

Can you replace the contents of the src/CMakeLists.txt with

idf_component_register(SRCS "main.c"
                    INCLUDE_DIRS ".")

?

5

Sadly gives me the same error:

/esp/esp-idf/components/freertos/port/port_common.c:135: undefined reference to `app_main'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
6

Hi I’m here with the same error. And I’ve googling it for days without any solution.

esp/esp-idf/components/freertos/app_startup.c:206: undefined reference to `app_main’

how can it be that hard to solve this problem ??

I have the main.c file

void app_main(void)
{
printf(“Hello world!\n”);

sem_vsync_end = xSemaphoreCreateBinary();
assert(sem_vsync_end);
sem_frame_buffer_ready = xSemaphoreCreateBinary();
assert(sem_frame_buffer_ready);

}

I’ve rename it to app_main.c and app_main.cpp. Everytime I do it. I’ve update the CMake file. PIO and VScode and ESP-IDF all of them are up to date. What do we missing?

This file was automatically generated for projects

without default ‘CMakeLists.txt’ file.

FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/.)

idf_component_register(SRCS ${app_sources})

idf_component_register(SRCS “app_main.cpp”
INCLUDE_DIRS “.”)