how to deploy an binary go file developed with 64bit system(mac) to 32bit system(ubuntu)

[Zhong Lee]

i did it naively, just scp this file to ubuntu, but it can't run, with error: cannot execute binary file.

so what is the preferred way to deal this situation? put .go files to ubuntu and install there?

[Dave Cheney]

Personally i'd just install Go on your target host and compile there,
it's the simplest.

If you want to try cross compiling from darwin/amd64 to linux/386 you
can try, http://dave.cheney.net/2012/09/08/an-introduction-to-cross-compilation-with-go.
Heed the warning that CGO is not supported when cross compiling.

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[Zhong Lee]

thanks 4 ur reply. i will choose method 1. also the link provided is very informational and interesting, but a little complicated 4 me.

[Matt Silverlock]

Assuming you are using homebrew on your Mac to build/install Go and installed it using `brew install go --cross-compile-common` (or `--cross-compile-all`)

$ GOOS=linux GOARCH=386 go build yourprog.go

That should output a binary that will run on 32-bit Ubuntu, provided you haven't used any cgo libs (as Dave touched on).

[Dave Cheney]

Ahhh, so that is how so many homebrew users end up with go
installations where cgo is disabled.

[Matt Silverlock]

Actually, that's my fault - you should have to type:

$ GOOS=linux GOARCH=386 CGO_ENABLED=0 go build yourprog.go

Homebrew itself still builds Go with cgo enabled for the host system: https://github.com/mxcl/homebrew/blob/master/Library/Formula/go.rb

[Dobrosław Żybort]

I know Dave Cheney blog post is very informative (same as rest posts on his blog) but just use goxc for cross compilation:
https://github.com/laher/goxc

Best regards,
Dobrosław Żybort

[Dave Cheney]

Yes, you should use goxc rather than my shell script.