Go: cmd/go: Issue with net/http with go modules on linux

[talgat-ruby]

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

$ go version
go version go1.12 linux/amd64

Does this issue reproduce with the latest release?

I have the latest 1.12

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

Linux Mint 19.1

go env Output

$ go env

GOARCH="amd64"

GOBIN=""

GOCACHE="/home/toshiba/.cache/go-build"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOOS="linux"

GOPATH="/home/toshiba/Documents/workspace/go"

GOPROXY=""

GORACE=""

GOROOT="/usr/local/go"

GOTMPDIR=""

GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"

GCCGO="gccgo"

CC="gcc"

CXX="g++"

CGO_ENABLED="0"

GOMOD="/home/toshiba/Documents/workspace/go_projects/active-sport-server/go.mod"

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -m64 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build887106064=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Tried to run GO111MODULE=on CGO_ENABLED=0 go build outside of $GOPATH in order to try go modules. But there seems some problem with net/http package.

$ cat main.go 
package main

import "net/http"

func main() {
    http.ListenAndServe(":8080", nil)
}

What did you expect to see?

correctly built

What did you see instead?

$ GO111MODULE=on CGO_ENABLED=0 go build
# crypto/rc4
/usr/local/go/src/crypto/rc4/rc4_asm.go:15:18: (*Cipher).XORKeyStream redeclared in this block
    previous declaration at /usr/local/go/src/crypto/rc4/rc4.go:61:6
# bytes
/usr/local/go/src/bytes/bytes_decl.go:10:6: IndexByte redeclared in this block
    previous declaration at /usr/local/go/src/bytes/bytes.go:101:34
/usr/local/go/src/bytes/bytes_decl.go:17:6: Equal redeclared in this block
    previous declaration at /usr/local/go/src/bytes/bytes.go:18:25
/usr/local/go/src/bytes/bytes_decl.go:24:6: Compare redeclared in this block
    previous declaration at /usr/local/go/src/bytes/bytes.go:37:27
# crypto/cipher
/usr/local/go/src/crypto/cipher/xor_amd64.go:9:6: xorBytes redeclared in this block
    previous declaration at /usr/local/go/src/crypto/cipher/xor.go:58:33
/usr/local/go/src/crypto/cipher/xor_amd64.go:22:6: xorWords redeclared in this block
    previous declaration at /usr/local/go/src/crypto/cipher/xor.go:83:27
# strings
/usr/local/go/src/strings/strings_decl.go:8:6: IndexByte redeclared in this block
    previous declaration at /usr/local/go/src/strings/strings.go:150:34

[mikioh]

Fortunately, tip works well with "GO111MODULE=on CGO_ENABLED=0 go build" at $GOROOT/src/net/http.

[acln0]

I think you have somehow overwritten your previous Go installation with a new one. The assembly implementation of rc4 was removed in 1.12, but you seem to have both.

I suggest wiping the current installation, and reinstalling Go, preferably using the official tarball rather than your OS package manager.

[agnivade]

Yes, your installation seems broken. This is not a modules issue. Just try with go build and even that should fail. Please delete your previous installation and do a clean install.

If that does not solve your issue, feel free to reopen. Thanks.

[talgat-ruby]

Thanks the deleting previous installation and reinstalling helped.