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go build -o main -tags main && go build -o main2 -tags main2

# run main2 by itself
./main2

# exits with a non-zero exit code and gives:
#
# 1st line to stdout
# 2nd line to stderr
# 3rd line to stdout

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$ cd $GOROOT/src
$ grep -h -r '^[ \t]*//go:' | sort | uniq
//go:a
//go:b
//go:c1
//go:c2
//go:cgo_dynamic_linker "<path>"
//go:cgo_export_dynamic _cgo_panic
//go:cgo_export_dynamic _cgo_topofstack
//go:cgo_export_dynamic crosscall2

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// this program demonstrates how fetches through gopherjs seem to be memory leaking.
package main

import (
        "fmt"
        "io"
        "io/ioutil"
        "log"
        "net/http"

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Use Go 1.10.3 which includes minimal module support for vgo transition:

$ cd /tmp
$ curl -s https://dl.google.com/go/go1.10.3.linux-amd64.tar.gz | tar -zx
$ export PATH=/tmp/go/bin:$PATH
$ which go
/tmp/go/bin/go
$ go version

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package main

import (
   "bufio"
   "fmt"
   "io"
   "os"
   "os/exec"
   "time"
)

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vgo: finding github.com/moby/moby v17.03.2-ce
vgo: finding github.com/RackSec/srslog 456df3a81436d29ba874f3590eeeee25d666f8a5
vgo: finding github.com/vdemeester/shakers 24d7f1d6a71aa5d9cbe7390e4afb66b7eef9e1b3
vgo: finding github.com/vishvananda/netns 604eaf189ee867d8c147fafc28def2394e878d25
vgo: finding github.com/aws/aws-sdk-go v1.4.22
vgo: finding github.com/docker/docker-credential-helpers f72c04f1d8e71959a6d103f808c50ccbad79b9fd
vgo: finding github.com/docker/go-connections ecb4cb2dd420ada7df7f2593d6c25441f65f69f2
vgo: finding github.com/docker/distribution 28602af35aceda2f8d571bad7ca37a54cf0250bc
vgo: finding github.com/fsnotify/fsnotify v1.2.11
vgo: finding golang.org/x/time a4bde12657593d5e90d0533a3e4fd95e635124cb

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Background

GopherJS is a compiler from Go to JavaScript that targets browser VMs.

The package github.com/gopherjs/gopherjs is the compiler program, responsible for transpiling Go code to JavaScript.

The package github.com/gopherjs/gopherjs/js provides an API for interacting with native JavaScript.

Because of the limited runtime environment afforded by a JavaScript VM (especially in the browser), GopherJS provides

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Usage

./install.sh <pkg list>

Issues

• Specific to git (fixable)
• Does not support specification of a major import path (fixable)

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$ export GOPATH=/tmp/tmp.INWBhiKAgt
$ cd /tmp/tmp.eoCQw0fOCT
$ mkdir hello
$ cd hello
$ export GOBIN=/tmp/tmp.opPK4KUGiw/hello/.bin
$ export PATH=/tmp/tmp.opPK4KUGiw/hello/.bin:/root/bin:/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
$ go mod init example.com/hello
go: creating new go.mod: module example.com/hello
$ echo "package main" >pkg.go
$ go get github.com/ianthehat/[email protected]

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export GOPATH=$(mktemp -d)
cd $GOPATH
mkdir -p src/example.com/hello
cd src/example.com/hello
export GOBIN=$PWD/.bin
export PATH=$GOBIN:$PATH
echo "package main" > pkg.go
go get github.com/mdempsky/gocode
pushd $(go list -f "{{.Dir}}" github.com/mdempsky/gocode)
git checkout 00e7f5ac290aeb20a3d8d31e737ae560a191a1d5