ESP8266 Community Forum

- Sun May 03, 2015 1:02 pm #16371 Hi all.

I've been trying for some time now to compile a simple program with espressif sdk.
The error I get is the following:

Code: Select allLD build/app.out
/home/andrei/workspace/licenta/toolchain/espressif_sdk/esp8266/esp-open-sdk/sdk/lib/libmain.a(app_main.o): In function `user_uart_wait_tx_fifo_empty':
(.irom0.text+0x3e4): undefined reference to `user_init'
/home/andrei/workspace/licenta/toolchain/espressif_sdk/esp8266/esp-open-sdk/sdk/lib/libmain.a(app_main.o): In function `user_uart_wait_tx_fifo_empty':
(.irom0.text+0x57e): undefined reference to `user_init'
collect2: error: ld returned 1 exit status
make: *** [build/app.out] Error 1


This is my code:

Code: Select all#include "ets_sys.h"
#include "osapi.h"

void user_init() {
    os_printf("SDK version: %s\n", system_get_sdk_versionn());
}


Some help would be greatly appreciated.
Thank you

- Sun May 03, 2015 1:44 pm #16376

This is my code:

Code: Select all#include "ets_sys.h"
#include "osapi.h"

void user_init() {
    os_printf("SDK version: %s\n", system_get_sdk_versionn());
}


Looks like you've put it into cpp file. Either move it to c (not cpp) file, or declare it as extern "C".

- Sun May 03, 2015 1:51 pm #16379

This is my code:

Code: Select all#include "ets_sys.h"
#include "osapi.h"

void user_init() {
    os_printf("SDK version: %s\n", system_get_sdk_versionn());
}


Looks like you've put it into cpp file. Either move it to c (not cpp) file, or declare it as extern "C".

It is in .c file. Tried with .cpp and extern "C" but it still won't work.

- Sun May 03, 2015 1:54 pm #16381

Looks like you've put it into cpp file. Either move it to c (not cpp) file, or declare it as extern "C".

It is in .c file. Tried with .cpp and extern "C" but it still won't work.

Ok, is that file compiled at all?
Can you add V=1 to your make command and share the full build log?