"multiple roots" error with 'go install buildmode=shared'

[aar...@arista.com]

Hello,

I am having trouble trying to build a shared library of my code using go1.5 rc1.

> go install -buildmode=shared ./...

multiple roots /home/aaronb/go/pkg/linux_amd64_dynlink & /home/aaronb/gosrc/pkg/linux_amd64_dynlink

'go build -buildmode=shared ./...' works just fine.

This fails in the same way using the HEAD of the master branch of the go repository.

I do have multiple versions of go installed on this machine since I am trying out go1.5. I switch between them by modifying PATH so that my desired go binary comes up first.

Here is the output of go env when I am using my compiled version the head of the go repostitory:

GOARCH="amd64"

GOBIN=""

GOEXE=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOOS="linux"

GOPATH="/home/aaronb/go"

GORACE=""

GOROOT="/home/aaronb/gosrc"

GOTOOLDIR="/home/aaronb/gosrc/pkg/tool/linux_amd64"

GO15VENDOREXPERIMENT=""

CC="gcc"

GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"

CXX="g++"

CGO_ENABLED="1"

Any help would be appreciated.

Thanks,

Aaron

[Ian Lance Taylor]

Yes, it's less than ideal, and please open an issue about this if
there isn't one already.

The problem is that ./... in GOPATH will need to link in the standard
libraries under GOROOT, and go install doesn't know where to install
the result.

The solution is

go install -buildmode=shared std
go install -buildmode=shared -linkshared ./...

You will get one shared library for the standard library, and one for
your code.

Ian

[aar...@arista.com]

Thanks for your help.

Here is the issue: https://github.com/golang/go/issues/12136