Cross-compile for Linux?

[matthewmueller]

Hey, thanks a lot for creating this package!

I've found it the example script works beautifully on mac but when I try to cross-compile for Linux, I get the following:

$ GOOS=linux go run main.go
./main.go:10:14: undefined: v8go.NewContext

This looks a bit like I'm just missing the package or something, but it does work when I remove the GOOS=linux.

$ go run main.go
addition result: 7

Here's my details:

OSX 10.5 (Catalina)
go version go1.13.4 darwin/amd64
(using go.mod)

[jimafisk]

I'm having the same issue, I can only compile the binary that corresponds to the OS of my laptop. I've ran the following tests on the same project:

On Mac:

• env GOOS=darwin GOARCH=amd64 go build ✔️
• env GOOS=linux GOARCH=amd64 go build ❌

On Ubuntu:

• env GOOS=darwin GOARCH=amd64 go build ❌
• env GOOS=linux GOARCH=amd64 go build ✔️

It would be great to be able to cross-compile for using things like Goreleaser with CI.

[matthewmueller]

@jimafisk chiming in here after learning more. Cross-compiling any cgo packages without additional compiler flags is not possible.

What you can try doing is installing different compilers to cross-compile. I haven't tested this with V8, but the general idea is here: mattn/go-sqlite3#384 (comment)

You can also try: https://github.com/mattn/go-sqlite3#cross-compiling-from-mac-osx.

Hope this helps. Please report back if you come up with anything.

[jimafisk]

Thanks for pointing me in the right direction here @matthewmueller! There was a lot I didn't know about cross compiling CGO.

Looks like goreleaser has a cgo docker image you could use: goreleaser/goreleaser#795

I was already using GoReleaser Action and wanted to continue using it: goreleaser/goreleaser-action#233. So ultimately I created a project that lets me do that: https://github.com/plentico/osxcross-target. Hopefully it helps someone else out!

[matthewmueller]

Very cool, thanks for sharing!