Thanks a lot for this. Tested everything and it works fine for ESP-IDF V4

And thats where my problem starts again, we are working on V3.
There are some good reasons for that, for example size of binary.
For that we need toolchain gcc_5.2 Is there anything available ?

And last not least, is ...

Is there a toolchain available for ESP32 and/or ESP8266 running on Raspberry PI ?

Hello Angus,
thanks for feedback. Let me try to give some more information.
Somewhere in my mind is something about this problem already appeared in esp-idf V3.2 but I'm not sure on that
Anyway, I was able to drill it down to this, using esp-idf master some days old.
1. clone esp-idf-template to ...

In our application we use some mbedtls_aes-functions.
If Hardware AES is enabled, linker runs into undefined reference
With Hardware AES disabled, this does not happen.

Is this a bug ? Or what is the reason ?

I'm converting an application from V3.1.3 to V4
There are 2 different files sntp.h
/home/esp32/esp-idf/components/lwip/include/apps/sntp/sntp.h
/home/esp32/esp-idf/components/lwip/lwip/src/include/lwip/apps/sntp.h
Looks like my app uses 2nd.
Any advice, what to do ?

@ESP_igrr, thanks for your response
Please let me give a feedback
According to your mail, I did

my project is espressif/esp-idf-template, mainly to create libs, which are later used in my project
copied sdkconfig from old V3.1.3 project to new V4 project
idf.py menuconfig
got message ...

Looks like there are some changes in sdkconfig.
Is there something like a translation (manual, tool) available ?

@ESP_igrr,
thanks, problem solved.
BTW, I agree to Mirronellis recommendation to add this to https://docs.espressif.com/projects/esp ... setup.html

Sorry, but ran into next problem.
Running . ./export.sh logs this
esp32@v93180:~/esp-idf$ . ./export.sh
Adding ESP-IDF tools to PATH...
WARNING: tool openocd-esp32 version v0.10.0-esp32-20191114 is installed, but the tool failed to run
ERROR: tool openocd-esp32 has no installed versions. Please run ...

@ESP_krzychb
thanks a lot, that helped.