details for "import cycle not allowed"?

[stephanos]

Hi there,

I just ran into a compiler error: init.go: import cycle not allowed

Obviously I've done something wrong.

But the message only shows half of the problem, init.go.

It would be interesting to see the other involved file(s), wouldn't it?

Cheers

Stephan

[Ian Lance Taylor]

Yes, and you normally should. What version of Go are you using? Do
you have a simple test case?

Ian

[stephanos]

Well, I was just about to prepare a test case when I stumbled upon something.

I created a simple 3-file-project with package A and B which depend on another.

When I executed go build it showed the warning as described above: init.go:3:8: import cycle not allowed

But when I prepared the sample for GitHub and adding the proper package path this happended:

package github.com/stephanos/go_import_cycle/pckg_a

imports github.com/stephanos/go_import_cycle/pckg_b

imports github.com/stephanos/go_import_cycle/pckg_a: import cycle not allowed

So perhaps this only works for full-path'ed packages?

PS: https://github.com/stephanos/go_import_cycle / https://github.com/stephanos/go_import_cycle_local

Regards

Stephan

[Ian Lance Taylor]

On Mon, Aug 26, 2013 at 8:32 AM, stephanos <stephan...@gmail.com> wrote:
> Well, I was just about to prepare a test case when I stumbled upon
> something.
>
> I created a simple 3-file-project with package A and B which depend on
> another.
> When I executed go build it showed the warning as described above:
> init.go:3:8: import cycle not allowed
>
> But when I prepared the sample for GitHub and adding the proper package path
> this happended:
> package github.com/stephanos/go_import_cycle/pckg_a
> imports github.com/stephanos/go_import_cycle/pckg_b
> imports github.com/stephanos/go_import_cycle/pckg_a: import cycle not
> allowed
>
> So perhaps this only works for full-path'ed packages?
>
> PS: https://github.com/stephanos/go_import_cycle /
> https://github.com/stephanos/go_import_cycle_local

Thanks for the test case.

http://golang.org/issue/6254

Ian

[Rob Pike]

Just last week I fixed the go command to print the import cycle, so if
you were using Go at tip you would have seen a description of the
cycle.

-rob

[atkaaz]

I think it's this commit, Rob's referring to: http://code.google.com/p/go/source/detail?r=690f8b24e42fbe14e85a8723b65a6391eea5e6d5

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[Ian Lance Taylor]

Bother, sorry about that.

Ian