Compiler fetching offline modules during build causing slow compiles

[tvarwig]

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

$ go version
go version go1.11 darwin/amd64

Does this issue reproduce with the latest release?

Yes latest stable release

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

go env Output

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/tvarwig/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/tvarwig/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/w4/xxfhfbg12j12lf5h78g0cg3r0000gn/T/go-build270144360=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

After enabling modules support go run and go build take minuets to compile. I have ran the go mod vendor to create the vendor folder. Without modules enabled compile time is less than a second. They do successfully compile.

After running verbose the compiler is trying to fetch offline modules with the following message https fetch failed: Get https://mygit.net/myapp/pb/users?go-get=1: dial tcp gitipaddress:443: i/o timeout

In the go.mod I have the replace option with those modules

module mygit.net/myapp/api/gui

require (
	mygit.net/myapp/pb/users v0.0.0
	github.com/dgrijalva/jwt-go v3.2.0+incompatible
	github.com/go-redis/redis v6.15.1+incompatible
	github.com/gogo/protobuf v1.2.0
	github.com/google/uuid v1.1.0
	github.com/iancoleman/strcase v0.0.0-20180726023541-3605ed457bf7 // indirect
	github.com/jpillora/go-tld v0.0.0-20180808214523-4bfc8d9a90b5
	github.com/labstack/echo v3.3.5+incompatible
	github.com/labstack/gommon v0.2.8 // indirect
	github.com/mattn/go-colorable v0.0.9 // indirect
	github.com/mattn/go-isatty v0.0.4 // indirect
	github.com/spf13/viper v1.3.1
	github.com/valyala/bytebufferpool v1.0.0 // indirect
	github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4 // indirect
	golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc
	google.golang.org/grpc v1.18.0
)

replace mygit.net/myapp/pb/users => ../../pb/users

What did you expect to see?

faster compiling times before modules. From what I have studies the replace should look locally and not fetch.

What did you see instead?

slow compile times.

[mvdan]

This seems like a duplicate of #27859, which has been marked as fixed for 1.12. Could you try usnig 1.12beta2?

[bcmills]

Closing as duplicate of #27859.

[tvarwig]

1.12beta2 does fix the issue