Cross compile error (on mac for linux)

[matyunin]

When I try to compile sample app natively on macos it's all ok:

$ cd $GOPATH/src/github.com/lazywei/go-opencv/samples
$ go build -o ./hello-mac hellocv.go
$ ls -lh hello-mac 
-rwxr-xr-x  1 user  user   2.3M Apr 24 16:42 hello-mac

But when I try to compile linux binary on my mac I get error:

$ cd $GOPATH/src/github.com/lazywei/go-opencv/samples
$ GOOS=linux GOARCH=amd64  go build -o ./hello-linux hellocv.go
# command-line-arguments
./hellocv.go:24: undefined: opencv.LoadImage
./hellocv.go:30: undefined: opencv.NewWindow
./hellocv.go:44: undefined: opencv.WaitKey

What I doing wrong?

[deadprogram]

Hi @matyunin the problem here is when using cgo as this package does you still need to compile/link against the target libs for the particular arch & OS. See https://github.com/lazywei/go-opencv/blob/master/opencv/cv.go#L7-L11

If there was a pure Golang implementation of an OpenCV-like library, then you would be able to cross-compile using the normal Golang compilation toolchain. But at least for the foreseeable future, you will need to compile on the target platform.