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cmd/link: -X doesn't work for vendored packages #19000

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@iterion

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@iterion

What version of Go are you using (go version)?

go version go1.7.3 linux/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/iterion/dev/go"
GORACE=""
GOROOT="/usr/lib/go"
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build201245685=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="0"

What did you do?

Run this build command with github.com/iterion/remotepkg in the vendor directory:
note: package above doesn't actually exist yet, but I can create it if needed for demonstration purposes.

go build -a -installsuffix cgo -o test -ldflags "-X github.com/iterion/remotepkg.timestamp=`date -u '+%Y-%m-%d_%I:%M:%S%p'`" .

main.go

package main

import (
  "github.com/iterion/remotepkg"
)

func main() {
  remotepkg.PrintEnv()
}

remotepkg.go

package remotepkg

import (
  "log"
)

var timestamp string

func PrintEnv() {
  log.Println(timestamp)
}

What did you expect to see?

Expect ./test to print build time.

What did you see instead?

Nothing is printed.

If the remote package is not in the vendor dir but does exist in your gopath in an expected place then the build time is correctly printed.

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