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cmd/link: Creating an archive from an installed package fails #12461

17twenty opened this issue Sep 3, 2015 · 2 comments

cmd/link: Creating an archive from an installed package fails #12461

17twenty opened this issue Sep 3, 2015 · 2 comments


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@17twenty 17twenty commented Sep 3, 2015

Me again testing weird cross-compilation options and think I've found another problem

I have created a package and installed it that contains a few functions, structs and interfaces and have been able to use it successfully when using go build.

I'd like to write a shim package for interfacing with C code and have run up against the following error:

$ go build -v -buildmode=c-archive fli_wrapper.go 
# command-line-arguments
/usr/local/go/pkg/tool/linux_386/link: running ar failed: exit status 1
ar: /go.o: No such file or directory

I have my custom package modemmanager built and installed:

ls ../../pkg/linux_386/       modemmanager.a 

But when I try and build the following I get the previous error:

package main

import (
    mm "modemmanager"

func GetAvailableModems() {

    log.Println("Getting Modems...")

    // Dial up the remote server
    conn, err := net.Dial("tcp", "localhost:8222")
    if err != nil {
    defer conn.Close()
    c := jsonrpc.NewClient(conn)

    // Get the available modems
    modems := make([]mm.Modem, 0)
    log.Println("Empty:", modems)

    // calling method on RPC server
    err = c.Call("ModemManager.GetAvailableModems", &modems, &modems)
    if err != nil {
        log.Fatal("error:", err)
    log.Println("Success: ", modems)


func main() { }

The modemmanager package consists of simply ~/gopath/src/modemmanager/common.go which defines the package modemmanager.

It makes no difference if I have the package available locally and specify the relative package location. Any ideas on why it can't run ar?

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@minux minux commented Sep 3, 2015

@ianlancetaylor ianlancetaylor changed the title Creating an archive from an installed package fails cmd/link: Creating an archive from an installed package fails Sep 3, 2015
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Sep 3, 2015
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@17twenty 17twenty commented Sep 3, 2015

I had a weird path issue and it was picking up the wrong library (one without an import "C" and //export directives) so just user-error in that case.

The only real take-home from this is that the error message makes no reference to the lack of exports/import "C" and gives an AR failure instead. Closing as, well, it's solved.

@17twenty 17twenty closed this Sep 3, 2015
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