You dont need this to compile qemu, but it looks nice and could be worth evaluating. This looked promising http://docs.platformio.org/en/latest/frameworks/espidf.html
I tried platformio for this project. https://github.com/Ebiroll/esp32_ultra
To try it out I did the following.
I installed. http://platformio.org/platformio-ide
It will download all you need to this directory. ~/.platformio/
Buildfiles will be generated in proj_dir/.pioenvs/
Check out this link. https://primalcortex.wordpress.com/2016/08/18/platformio/
yaourt -S platformio
// This does not seem like the latest version. 1.12
yaourt -S atom-editor-bin
cd /project dir
pio platforms install espressif32
pio init --board esp32thing
Add this to platformio.ini
[platformio]
src_dir = main
This way you can chose to use esp-idf or platformio.
Arch linux uses python 3 as default. Set python interpreter as python2
make menuconfig
SDK tool configuration --->
(python2) Python 2 interpreter
I had to cp sdkconfig.h manually to main directory to compile.