Hi, from my observation, its default compiler is gcc-arm-none-eabi.
Then, is there a way to compile px4-v2-quad firmware with LLVM? (not for SITL )
It seems there are options for LLVM compilation. But, I failed.
If it exists, could you provide the exact command?
Note that my target version is the recent version uploaded on git repo.
No, not for PX4 boards.
I appreciate your response.
So… if you are an Ardupilot developer, could you tell me why LLVM does not work?
I need to explain to my colleagues. However, I don’t have good reasons why LLVM is not applicable.
Because it doesn’t support the same options GCC does - and PX4 builds are more complex than all others, multiple places need changes.
Ok thank you for your comment.
I’ve added support for the actual PX4 Firmware using LLVM here: https://github.com/PX4/Firmware/pull/6892
It shouldn’t be much different to add it into Ardupilot’s build tools. It’s definitely on my todo list, but if you get to it first that’ll be great 
Thank you for your comment. I will try compilation with your work.