How to build a universal MachO library 'amd64+arm64' for MacOS?

[jugglingjsons]

I am having issues with my export on macOS - not sure what I am doing wrong, I was wondering if we could have a working example as title says.
I would need the help of someone more knowledgable to get that working, since I am not getting anywhere myself though.

[Splizard]

Are you trying to build for other platforms and architectures? ie. Windows and Linux from Mac.

And/or are you having issues with exporting the project for Mac?

[Splizard]

On the export issue, is this because for MacOS, Godot is trying to create a universal .MachO ? With amd64+arm64 packed into the same binary? If this is the case you will need to use GOARCH variables to build both libraries.

[jugglingjsons]

Exactly that - universal builds, I have tried exporting both binaries separately for now. I am not sure if there is any templating possible for the extension file.
I mean I have run separate exports with the go file compiled for specific arch.
Both builds worked fine then - yet to check if I can somehow make it work with both binaries built in the same export.

[Splizard]

I believe there is mac os tooling to merge two binaries together for this. Not sure how to signal this to Godot, the values used in the extension file are a bit bespoke. Essentially Godot looks for a whole bunch of matching values, to get the best match, these values aren't explicitly documented or specified.

[jugglingjsons]

You are correct. I've verified it over the weekend and using:(same versions run on intel mac and m1, build on m1)

env CGO_ENABLED=1 CGO_CFLAGS=-O3 GOARCH=amd64 go build -o darwin_amd64.dylib -buildmode=c-shared

and

env CGO_ENABLED=1 CGO_CFLAGS=-O3 GOARCH=arm64 go build -o darwin_amd64.dylib -buildmode=c-shared

and bundling it later on with :

lipo -create <pathToIntel.a> <pathToArm.a> -output <pathToUniversal.a>

Yields a working universal build.
If you're open to PRs, I will add that to the documentation with links as to why and such.

[Splizard]

Thanks, I'm certainly keen to support this, if you were looking to contribute here, perhaps the gd command could handle this automatically?

[jugglingjsons]

Took me a while, but opened an initial PR, let's continue the discussion there ;)