Recommended way to build go 1.5 on ppc64le

[lab...@linux.vnet.ibm.com]

Hi,

Last time I tried, the build of go 1.5 on ppc64le it required a go 1.4 build somewhere to bootstrap from.  Since go 1.4 is not supported on Power (ppc64le or ppc64(be)) you can't just build go 1.4 on ppc64le.

What I have been doing is building from the master branch using a commit from before this requirement was introduced as my bootstrap go and then building from the latest master source on ppc64le.  (This was suggested by Russ Cox months ago.)

Is that still the recommended method?  It seems like my bootstrap go compiler on ppc64le could be outdated if I build this way (or maybe it doesn't matter for the bootstrap compiler)?

- Lynn

[Dave Cheney]

You can cross compile a bootstrap compiler from the 1.5 sources

env GOOS=linux GOARCH=ppc64le ./bootstrap.bash

Cooy that file to the target, unpack it and use that location as GO_BOOTSTRAP_ROOT

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[Michael Hudson-Doyle]

You should also be able to bootstrap with gccgo-5.

[Dave Cheney]

Yes. That is true. Both should work just fine (and I've tested it both ways)

[minux]

It's possible to use commits on dev.power64 to complete bootstrap in a

three step process without cross compiling on another host or gccgo.

Build Go 1.4 cmd/dist (this is a C program), and use it to build the last

commit in dev.power64. (In that branch, all toolchains are still in C, only

the dist tool is in Go.)

But that toolchain is buggy, so it can'be used to bootstrap Go 1.5. Instead,

you need to use that to bootstrap rev 2e78447bafc2dfdfa8b75e01ca3e681741706bbc

on the master branch.

And then you have a working toolchain that could be used to bootstrap Go

1.5. After you've bootstrapped Go 1.5, you can use it to bootstrap future

revisions.

I've tested this process recently when trying to bootstrap Go on linux/ppc64

system with only gcc. I think the linux/ppc64le process should be similar.
(The 2nd commit is essential for linux/ppc64 but not so essential for ppc64le)

[Russ Cox]

It's nice that you can do this, but it seems like a lot more work than running bootstrap.bash on a non-ppc64 system. There are still x86 machines here and there.

Russ