build: should raise error when GOROOT_BOOTSTRAP == GOROOT

[songgao]

Despite src/all.bash asks to Set $GOROOT_BOOTSTRAP to a working Go tree >= Go 1.4., it seems that only a Go 1.4 tree works. Setting $GOROOT_BOOTSTRAP to a Go 1.5 tree yields error:

##### Building Go bootstrap tool.
cmd/dist

##### Building Go toolchain using /Users/songgao/go.
runtime
go tool: no such tool "compile"
go tool dist: FAILED: /Users/songgao/go/bin/go install -v bootstrap/...: exit status 3

Is this a bug?

[ianlancetaylor]

Yes, that would be a bug. I can't recreate it, though. I tried it and it worked fine for me.

Do you have GOROOT set in the environment?

Can you show the exact steps you followed?

[bradfitz]

What is your environment?

Are you trying to compile Go 1.5 with the same Go 1.5 directory? That is, is your $GOROOT_BOOTSTRAP equal to your current directory (without the "src") part? That won't work.

[davecheney]

@bradfitz that sure doesn't work, and matches the OP's report

% env GOROOT_BOOTSTRAP=$HOME/go ./all.bash
##### Building Go bootstrap tool.
cmd/dist

##### Building Go toolchain using /home/dfc/go.
runtime
go tool: no such tool "compile"
go tool dist: FAILED: /home/dfc/go/bin/go install -v bootstrap/...: exit status 3

We should add a check to ./all.bash to halt in this case

[davecheney]

https://go-review.googlesource.com/13719

[songgao]

Yeah I think it's because I set the GOROOT_BOOTSTRAP to the go1.5 where all.bash is run.

Somehow I was under the impression that using a different copy of go1.5 tree gave the same error but I couldn't reproduce that one. Maybe I mis-typed something.

[gopherbot]

CL https://golang.org/cl/13719 mentions this issue.

[oneumyvakin]

What it actually should means?

echo "ERROR: \$GOROOT_BOOTSTRAP must not be set to \$GOROOT" >&2
echo "Set \$GOROOT_BOOTSTRAP to a working Go tree >= Go 1.4." >&2

What is the right path for GOROOT_BOOTSTRAP ?

[bradfitz]

@oneumyvakin, please bring questions to the golang-nuts@ mailing list. This is a closed bug.

The short summary is you need Go to build Go. Details are at https://golang.org/s/go15bootstrap