Mac arm64 prebuild

[dgrijuela]

I'm not being able to package an electron app for the new mac m1 chip. It says it couldn't find leveldown binaries for that system.

These are the binaries found:

Any help? Thanks :)

[vweevers]

The ability to produce prebuilt binaries for M1 (Apple silicon) is blocked by actions/runner-images#2187.

Are you able to compile from source?

[vweevers]

We might be able to cross-compile on an intel mac. Help is wanted, I don't own either.

[dgrijuela]

The ability to produce prebuilt binaries for M1 (Apple silicon) is blocked by actions/virtual-environments#2187.

Are you able to compile from source?

I'll try to ask someone with the M1 do the npm i leveldown --build-from-source and post here the results. Thank you @vweevers

[vweevers]

We might be able to cross-compile on an intel mac.

An easier option is to build "fat binaries" that work on both x64 and arm64. Here's how fsevents did it: fsevents/fsevents#350.

Tasks:

• Finish Move to GitHub Actions #764
• Build a universal binary to support M1 (Apple silicon) #781
• Test on both M1 and Intel mac (help wanted here)
• Find out if these changes affect older mac support: no, if we set MACOSX_DEPLOYMENT_TARGET
• Naming of fat binaries for M1 (Apple silicon) prebuild/prebuildify#52
• Pass --arch to node-gyp instead of --target-arch prebuild/prebuildify#53
• Support multi-arch prebuilds for M1 (Apple silicon) prebuild/node-gyp-build#40

[ralphtheninja]

I can help with testing on Intel.

[vweevers]

Testers wanted! On both Intel and M1. If you have such a machine, please run:

git clone --recurse-submodules https://github.com/Level/leveldown.git
cd leveldown
git checkout apple-silicon
npm i --ignore-scripts
npm run prebuild-darwin-x64+arm64
npm run test-prebuild

[ikreymer]

I can confirm the above steps worked on Apple M1 (updated the package.json to the newly released node-gyp-build 4.3.0).
I was able to manually add the prebuild to a universal osx electron app and it seems to be working. Thanks!

[vweevers]

6.0.3