Tests fail on Apple Silicon about proj HOT 7 CLOSED

I've reproduced this. Taking a look now.

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I haven't solved this yet, but some notes:

On arm64 mac:

• Reproduced this failure using homebrew proj (7.2.1)
• Reproduced this failure using bundled proj (7.1.0)
  • This first required resolving a "'libtiff' couldn't be found" compiler error. I think this was due to homebrew switching it's root from /usr/local -> /opt/homebrew.
• Successfully built and passed test suite using homebrew proj 7.2.1 on rosetta (x86_64 emulator) and x86_64 toolchain

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I made a minimal reproduction of the issue here: https://github.com/georust/proj/blob/frewsxcv-min/src/main.rs in this draft PR #63

I have absolutely no idea what's going on 😔

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I think we should cast the net wider and see whether the PROJ maintainers (or anyone else in the community) have begun to test on M1, and if they have, whether they can repro this using analogous c or cpp (which I cannot write at all) wrapping the API calls. I just don't see what's wrong on the Rust side.

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I don't currently have access to my M1 machine, but IIRC I was able to build and pass the proj test suite (the c++ one).

I think it was as simple as running ctest from the root of the libproj directory, but my memory is fickle.

My best guess was that it had to do with how we were managing pointers, similar to what @urschrei fixed in #56 but I don't yet have any real evidence or solution.

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This is probably the underlying bug: rust-lang/rust-bindgen#1973

from proj.

This is probably the underlying bug: rust-lang/rust-bindgen#1973

Confirmed this is the bug. I got tests passing on my Macbook Air M1 with these changes: #65

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