runtime/debug: ReadBuildInfo returns no information about main module

[vearutop]

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

$ go version
go version go1.18 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/vearutop/Library/Caches/go-build"
GOENV="/Users/vearutop/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/vearutop/go/pkg/mod"
GONOPROXY="github.com/adjust,github.com/vearutop,github.com/Unbotify"
GONOSUMDB="github.com/adjust,github.com/vearutop,github.com/Unbotify"
GOOS="darwin"
GOPATH="/Users/vearutop/go"
GOPRIVATE="github.com/adjust,github.com/vearutop,github.com/Unbotify"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/vearutop/sdk/go1.18"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/vearutop/sdk/go1.18/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.18"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/vearutop/dev/temp/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/n7/jv2b0zv57jzc8y6zhmfzbn7c0000gn/T/go-build2483865593=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Moved into an empty directory, ran go mod init example and then ran this program:

package main
import (
    "fmt"
    "runtime/debug"
)
func main() {
    info, available := debug.ReadBuildInfo()
    fmt.Printf("%v %#v\n", available, info)
}

What did you expect to see?

true &debug.BuildInfo{GoVersion:"go1.18", Path:"command-line-arguments", Main:debug.Module{Path:"example", Version:"(devel)", Sum:"", Replace:(*debug.Module)(nil)}, Deps:[]*debug.Module(nil), Settings:[]debug.BuildSetting{debug.BuildSetting{Key:"-compiler", Value:"gc"}, debug.BuildSetting{Key:"CGO_ENABLED", Value:"1"}, debug.BuildSetting{Key:"CGO_CFLAGS", Value:""}, debug.BuildSetting{Key:"CGO_CPPFLAGS", Value:""}, debug.BuildSetting{Key:"CGO_CXXFLAGS", Value:""}, debug.BuildSetting{Key:"CGO_LDFLAGS", Value:""}, debug.BuildSetting{Key:"GOARCH", Value:"amd64"}, debug.BuildSetting{Key:"GOOS", Value:"darwin"}, debug.BuildSetting{Key:"GOAMD64", Value:"v1"}}}

What did you see instead?

true &debug.BuildInfo{GoVersion:"go1.18", Path:"command-line-arguments", Main:debug.Module{Path:"", Version:"", Sum:"", Replace:(*debug.Module)(nil)}, Deps:[]*debug.Module(nil), Settings:[]debug.BuildSetting{debug.BuildSetting{Key:"-compiler", Value:"gc"}, debug.BuildSetting{Key:"CGO_ENABLED", Value:"1"}, debug.BuildSetting{Key:"CGO_CFLAGS", Value:""}, debug.BuildSetting{Key:"CGO_CPPFLAGS", Value:""}, debug.BuildSetting{Key:"CGO_CXXFLAGS", Value:""}, debug.BuildSetting{Key:"CGO_LDFLAGS", Value:""}, debug.BuildSetting{Key:"GOARCH", Value:"amd64"}, debug.BuildSetting{Key:"GOOS", Value:"darwin"}, debug.BuildSetting{Key:"GOAMD64", Value:"v1"}}}

go1.17 shows

true &debug.BuildInfo{Path:"command-line-arguments", Main:debug.Module{Path:"example", Version:"(devel)", Sum:"", Replace:(*debug.Module)(nil)}, Deps:[]*debug.Module(nil)}

while go1.18 returns empty Path and Version for Main module.

[seankhliao]

Duplicate of #51831