cmd/tool/compile: go build cannot generate executable file

[hitzhangjie]

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

$ go version

go version go1.19.1 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="on"

GOARCH="amd64"

GOBIN=""

GOCACHE="/Users/zhangjie/Library/Caches/go-build"

GOENV="/Users/zhangjie/Library/Application Support/go/env"

GOEXE=""

GOEXPERIMENT=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GOINSECURE=""

GOMODCACHE="/Users/zhangjie/go/pkg/mod"

GONOPROXY=""

GONOSUMDB=""

GOOS="darwin"

GOPATH="/Users/zhangjie/go"

GOPRIVATE=""

GOPROXY="https://goproxy.cn,direct"

GOROOT="/usr/local/go"

GOSUMDB="off"

GOTMPDIR=""

GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"

GOVCS=""

GOVERSION="go1.19.1"

GCCGO="gccgo"

GOAMD64="v1"

AR="ar"

CC="clang"

CXX="clang++"

CGO_ENABLED="1"

GOMOD="/Users/zhangjie/Downloads/image/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/0j/mvtnlhyj5j9cyqqq1b27bgg40000gn/T/go-build4139814822=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I create following files under folder image:

file1: go.mod

module image

go 1.19

file2:

package main

import "fmt"

func main() {
	fmt.Println("hello world")
}

Then I run go build, then no any error reported, and echo $? outputs 0. That said go build success, but no any executable generated.

What did you expect to see?

I think it should generate the executable.

What did you see instead?

No executable generated. Go compiler doesn't differentiate go inner image package and user-defined image module? If I rename module image to xxx/image, it works as expected.

[ryicoh]

That's true, but i think it should print errors instead of generate the executable.

[hitzhangjie]

Good idea.

Should the standard library or any package in go/src be considered a module?

[ryicoh]

Yes, and should throw the error that package name is duplicated.

[gopherbot]

Change https://go.dev/cl/434095 mentions this issue: cmd/go: show error when mod name conflict with std lib path

[bcmills]

Duplicate of #35270