Hood Chatham

Thanks @alexmojaki. I don't think this issue was fixed. #2393 is fixed. Not sure about the others.

Huh I don't know which commit would have fixed this but that's good news. Maybe we can reenable the webpack test

Error is: ``` CMake Error at caterva/CMakeLists.txt:13 (add_library): The install of the caterva_ext target requires changing an RPATH from the build tree, but this is not supported with the Ninja...

@ryanking13 was saying that we shouldn't use `emcmake` because it will route around our other toolchain wrappers.

Maybe we can symlink cmake and automatically inject the toolchain file?

@henryiii would you mind adding the needed environment info somewhere around here: https://github.com/pyodide/pyodide/blob/6fc28c5669dfeb22c5e9544144a35a1f8b655365/pyodide-build/pyodide_build/pywasmcross.py#L111 I don't really understand what needs to be added.

Does this superceed #590? > Use python3 explicitly everywhere I think it is important to use a virtual environment. We really need Python 3.9.x and on most machines python3 won't...

It would probably be helpful to install gnu-sed for mac builds: https://stackoverflow.com/a/27834828/1942152 Since we don't test the mac build, it might be hard for us to ensure that all uses...

> is this really much faster? -- I don't think so Well in the best case `micropip` takes two sequential requests to download a wheel: 1. https://pypi.org/pypi/pkg-name/json 2. https://files.pythonhosted.org/packages/ha/sh/more-hash/pkg-name.whl Once...

Also, it should be possible in the future to download some dependencies from a lock file while Pyodide is loading, in which case we can load packages with 0 extra...