build: bootstrapping Go 1.n on macOS Sierra from source

[bradfitz]

@andlabs pointed out in #16272 (comment) that as of macOS Sierra, we'll have no way to bootstrap Go 1.N from source.

Maybe we need to backport @ianlancetaylor's time fix to Go 1.4?

[bradfitz]

Nevermind. @ianlancetaylor says it works fine on Sierra. You can build Go 1.4 there and time won't work and tests will fail, but it will successfully build Go 1.7.

[andlabs]

Good to know. I'm fine with untested 1.4s (the tests take too long to run on my virtual machines so I don't have a choice in those cases =P ); hopefully this won't break something else in the future.

[ianlancetaylor]

I'm closing this because I believe that it works fine today.

[bradfitz]

As of Sierra Beta 4, this issue is again relevant.

[kirillDanshin]

I think we need to backport this fix in 1.4.4 as soon as possible.
we could also wait for Sierra stable release but now folks can't install Go from source.

[bradfitz]

@kirillDanshin, we're going to wait until Sierra is released. It's already changed twice during Sierra betas.

[kirillDanshin]

ok @bradfitz ping me here when we'll going to backport the fix, I'll do it.

[ianlancetaylor]

@kirillDanshin People using a beta version of Sierra and building Go from source should, I hope, be able to apply a patch to their 1.4.3 sources. It doesn't make sense for us to release 1.4.4 now, given that the code in Sierra has changed twice already.

[tattwamasi]

Has anyone filed a radar with Apple, and would it be worth it to? I was about to, and reference this and related issues, but will reference other IDs if already filed. (Edit: based on conversation in the other issues re: the change, seems like it isn't worth bringing up)

I had a working Go, but the b4 broke it, or I did with something else, so I was (re)installing with brew. Is there a easy(ish) way to build using the 1.4.3 patch with brew, or am I better off just pulling 1.4.3 from git and going from source?