Can't compile using gcc-go

[micwoj92]

Describe the bug
Application gets error when trying to compile using gcc-go on Arch Linux.

To Reproduce
Steps to reproduce the behavior:

1. Get croc PKGBUILD that Arch Linux uses
2. run makepkg -si in directory with PKGBUILD
3. See error

# github.com/schollz/peerdiscovery
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
  381 | type PacketConn4 struct {
      |      ^
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type ipv4.genericOpt)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
  396 | type PacketConn6 struct {
      |      ^
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type ipv6.genericOpt)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
vendor/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)

Expected behavior
Application should build as it does when using regular go.

Version
croc version v8.6.12-c373b38

Additional context

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/micwoj92/.cache/go-build"
GOENV="/home/micwoj92/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/micwoj92/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0"
GCCGO="/usr/bin/gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build599677254=/tmp/go-build -gno-record-gcc-switches -funwind-tables"

[schollz]

Its a weird error you are getting, what version of gcc-go are you using? Does building with normal go on the same system work?

[micwoj92]

Its a weird error you are getting, what version of gcc-go are you using?

go version go1.14.4 gccgo (GCC) 10.2.0 linux/amd64

Does building with normal go on the same system work?

yes

[schollz]

What if you update to the latest version of go gcc

[micwoj92]

Arch Linux currently has gcc 10.2.0 in repos, I will compile 10.3.0 from source and report back.

[micwoj92]

Getting exactly same error, go version it reports go version go1.14.6 gccgo (GCC) 10.3.0 linux/amd64

[micwoj92]

Last version I can build is 6.4.10, with 6.4.11 peerdiscovery bumped from 1.4.1 to 1.5.0

[micwoj92]

Now I tried using go get command from peerdiscovery readme

$ go get -u github.com/schollz/peerdiscovery
# github.com/schollz/peerdiscovery
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
  381 | type PacketConn4 struct {
      |      ^
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type ipv4.genericOpt)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:381:6: error: incompatible type for receiver (cannot use type PacketConn4 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
  396 | type PacketConn6 struct {
      |      ^
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type ipv6.genericOpt)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)
../../go/src/github.com/schollz/peerdiscovery/peerdiscovery.go:396:6: error: incompatible type for receiver (cannot use type PacketConn6 as type socket.Conn)

So I guess issue should be opened there?

[schollz]

Sure, I'm really not sure what's going on here. I don't use gcc-go, so will have to wait for someone who does.

[micwoj92]

apparently fixed in gcc 13 schollz/peerdiscovery#22 (comment)

[micwoj92]

Now on gcc 13 getting error in different package
twmb/murmur3#11

[github-actions]

Stale issue message

[micwoj92]

With gccgo lagging behind and missing language features (such as generics) I don't think it makes sense to keep this issue open.
go version go1.18 gccgo (GCC) 13.2.1 20230801 linux/amd64