Error building rustc on M1 MacBook

[TheDeveloper101]

I was building rustc to work on autodiff, and followed the process mentioned here: https://rustc-dev-guide.rust-lang.org/autodiff/installation.html.

I expected to see this happen: when I ran the ./x.py build --stage 1 library command I expected the build to succeed.

Instead, this happened: when it was building gsl, it gave me an error that it could not find math.h, and the build failed.

Did not provide a backtrace since it took over an hour to reach this point on my machine.

[ZuseZ4]

If you re-run the command, it will restart just before the moment where it crashed, that should allow you to provide more information. Also, please don't open new issues here, I just haven't archived this fork yet because some CI still relies on it and there are a few open issues left. No other rustc dev will be able to help here, so please copy your issue to the rust-lang/rust repo, sorry for the inconvenience.