Is it possible to use clang instead of gcc with PlatformIO?

Development Platforms
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I’d like to use clang instead of gcc to compile a project made with PlatformIO (the target is an STM32F4Discovery board). Is that possible? I was unable to find a clang package in the PlatformIO registry, so I don’t think this would work out of the box on a new install – but assume I’m willing to install it on my system directly. Is there an option I could set in platformio.ini or somewhere else to make it compile with clang?

For those wondering why I would want to do that, there are many reasons discussed here.

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Thank you very much. I was able to use the ideas from maxgerhardt’s repository to make it work for my project.