go build src code of `go doc`

[Gert]

Hmm trying to work on the src code of `go doc` but every time I try to compile a ./doc binary it uses other src code, it doesn't look in the current directory am in, I have to force it `go build main.go` what going on here? 

gert@gert ~/Desktop/go/src/cmd/doc:master> go build

gert@gert ~/Desktop/go/src/cmd/doc:master> ls

dirs.go         doc             doc_test.go     main.go         pkg.go          testdata

I can see a doc binary getting created but its not build form the main.go in current directory, I deliberately put a syntax error in main?

gert@gert ~/Desktop/go/src/cmd/doc:master> go build main.go 

# command-line-arguments

./main.go:78:2: syntax error: unexpected --, expecting }

gert@gert ~/Desktop/go/src/cmd/doc:master> go env

GOARCH="amd64"

GOBIN="/Users/gert/bin"

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

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GOOS="darwin"

GOPATH="/Users/gert/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="/Users/gert/Desktop/go/src/cmd/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 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/dv/8tlwvjr91zjdyq4rk14lkkfm0000gn/T/go-build645754300=/tmp/go-build -gno-record-gcc-switches -fno-common"

[Ian Lance Taylor]

This may be related to https://golang.org/issue/32724. Is your
cmd/doc directory underneath the directory displayed by `go env
GOROOT`?

Ian

[Gert]

On Thursday, June 27, 2019 at 12:11:58 AM UTC+2, Ian Lance Taylor wrote:

Nope `~/Desktop/go/src/cmd/doc` (git clone of go itself) is not in GOROOT nor in GOPATH using a seperate bootstrap go version devel +f938b9b33b Wed Jun 26 20:26:48 2019 +0000 darwin/amd64 in /usr/local/go

So I assume if I match GOROOT with the repo as in git clone everything in /usr/local/go and bootstrap using a /usr/local/go1 then i can work on go doc. Going to try that now

[Gert]

Yep working when I develop in GOROOT directly, but not sure if this intended by design that you can only develop on go src itself that way.

[Ian Lance Taylor]

It is not intended. It is a bug.

It would be helpful if you could describe this on
https://golang.org/issue/32724. Thanks.

Ian