Is there a way to cross-compile for different CPU architectures?

[corruptmemory]

Obviously, what I'm looking for is some way to produce binaries for arm64 and amd64. This results in an angry message:

env GOOS=darwin GOARCH=amd64 go build -v .

Produces:

env GOOS=darwin GOARCH=amd64 go build -v .
package ...
        ...
        imports github.com/progrium/macdriver/dispatch: build constraints exclude all Go files in /Users/jim/go/pkg/mod/github.com/progrium/macdriver@v0.5.0-preview.0.20230925233903-5cbb735647c0/dispatch
package ...
        ...
        imports github.com/progrium/macdriver/helper/action: build constraints exclude all Go files in /Users/jim/go/pkg/mod/github.com/progrium/macdriver@v0.5.0-preview.0.20230925233903-5cbb735647c0/helper/action

[corruptmemory]

Yes, I'm currently on an Apple Silicon Mac 😁

[progrium]

It should be that simple. BUT because of cgo it's not. That could change if we get purego integrated, but until then you'll have to look into projects like this: https://github.com/karalabe/xgo

[corruptmemory]

Actually ... it turns out that this question has come up on the main Go repository on Github. There is an issue here:

golang/go#44112

This magical incantation worked just fine for me:

Arm64:

$ CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 \
    SDKROOT=$(xcrun --sdk macosx --show-sdk-path) \
    go build -o <program-name>-arm64 <path>

Amd64:

$ CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 \
    SDKROOT=$(xcrun --sdk macosx --show-sdk-path) \
    go build -o <program-name>-amd64 <path>

I was able to make a universal binary with:

$ lipo -create -output <program-name> <program-name>-amd64 <program-name>-arm64

Hope this helps!