ESP8266 GDB RTOS Global Class – Error undefined reference to __dso_handle'

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    This may be more of a RTOS / programming question… but after scouring for a solution, I’ll start by asking here as almost all of the code is from the ESP8266 GDB Wizard when creating a sample project.

    I am following the ESP8266 GDB tutorial here:

    and I have it working properly.

    The curious thing happens when I tried to add a new C++ class, and declare a global variable instantiating that class in the main application. As a global variable, compile fails with:

    Severity Code Description Project File Line Suppression State
    Error  undefined reference to __dso_handle'</strong> temp_ESP8266GDB C:\workspace\temp_ESP8266GDB\temp_ESP8266GDB\HTTPDemo.cpp 115
    <strong>Error  undefined reference to
    ‘ temp_ESP8266GDB C:\workspace\temp_ESP8266GDB\temp_ESP8266GDB\VisualGDB\Debug\HTTPDemo.o 1
    Error  undefined reference to `__cxa_atexit’ temp_ESP8266GDB C:\workspace\temp_ESP8266GDB\temp_ESP8266GDB\HTTPDemo.cpp 34
    Error  ld returned 1 exit status temp_ESP8266GDB C:\workspace\temp_ESP8266GDB\temp_ESP8266GDB\collect2.exe 1

    Even more interesting: the problem only occurs when there’s a destructor implemented.

    If there’s no destructor, or the instance declaration is not global, there’s no error. As a local variable, there’s no complaint. The compile error only occurs for global declarations where the class includes a destructor.

    The HX711.h header file:

    #ifndef HX711_h
    #define HX711_h

    class HX711


    and the HX711.cpp source file:

    #include “HX711.h”



    Surely I am missing something obvious. I am fairly new to RTOS, but as far as I can tell, there are no issues with global variables (other than of course, to be aware of the multi-treaded dangers). Are there indeed “issues” with destructors in RTOS global class instances?

    I am running VisualGDB 5.2R9 (build 1452) in Visual Studio Enterprise 2017 Version 15.1 (26403.0) Release on Windows 10

    Thanks in advance







    Thanks, looks like a toolchain bug. Can you reproduce this with the command-line ESP-IDF environment as well?



    I’ve not used the ESP-IDF command-line, nor have I been able to find it for the ESP8266. Is it the same as this one for the ESP32? This one:

    The GitHub repository also only mentions the ESP32:



    ESP-IDF is for ESP32; if you are using ESP8266, it’s either RTOS SDK, or non-OS SDK. Both can be downloaded from here:

    You can also simply post your test program here and we could quickly check if the problem is reproduced with the original command-line build tools.

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