Hi ESP_igrr, thank you for your response. I can understand that development in ESP-IDF is easier. But I don't think the two are mutually exclusive :). You can build it as part of the toolchain, and then build a newer version as part of ESP-IDF and use that. Once you are happy with your changes and t...

How is ESP32 different here from every other architecture? E.g. AVR? Embedded ARM? They all allow creating an ELF file. It should always be possible to create an ELF file, even if that on its own is useless. I fail to see why xtensa-esp32-elf would need to be any different than e.g. arm-none-eabi-el...

It's not just that it does not integrate with CMake - it does not integrate with anything. Even if it would integrate with CMake, that would still not be sufficient, as not all software uses CMake. The problem is that the toolchain is actually incomplete - if you try to use xtensa-esp32-elf-gcc to c...