How to build a golang project that uses CGO?

Question

Oracle

Hello! Please help me figure it out. I wrote a Golang application
on Windows 10 . This application uses several third-party libraries. One of them is goracle for connecting to Oracle database. The project is running locally. On my local machine (windows 10) I'm trying to build a binary with the following command:

$Env:GOOS = "linux"; $Env:GOARCH = "amd64"; go build

Unfortunately I see the following error:

# gopkg.in/goracle.v2
../gopkg.in/goracle.v2/orahlp.go:60:2: undefined: describeOnly
../gopkg.in/goracle.v2/orahlp.go:223:26: undefined: PlSQLArrays
../gopkg.in/goracle.v2/orahlp.go:246:32: undefined: VersionInfo
../gopkg.in/goracle.v2/orahlp.go:249:10: undefined: VersionInfo
../gopkg.in/goracle.v2/orahlp.go:255:32: undefined: VersionInfo
../gopkg.in/goracle.v2/orahlp.go:272:19: undefined: VersionInfo
../gopkg.in/goracle.v2/orahlp.go:273:31: undefined: ObjectType
../gopkg.in/goracle.v2/orahlp.go:274:31: undefined: Event
../gopkg.in/goracle.v2/orahlp.go:274:41: undefined: Subscription
../gopkg.in/goracle.v2/orahlp.go:284:27: undefined: conn
../gopkg.in/goracle.v2/orahlp.go:249:10: too many errors

I am going to use this binary on a production server (CentOS) in order to wrap it in Docker in the future.
Found a post with a similar problem. One of the comments says that some CGO is needed and it can be built directly in Docker-e. I have a question, how to do it?

Answer 1

The easiest way for you to build this whole thing directly on CentOS.
CGO does not need to be assembled, it already works out of the box. It's just that you don't have the Linux binary libraries on your Windows machine that you need to build. So build under CentOS with oracle libraries installed.

Answer 2

If you have a docker, you should try the xgo project ( https://github.com/karalabe/xgo )
I use it myself to compile projects from cgo to macos for linux x64/arm