[bug#30579] Go 1.10

[Marius Bakke <mbakke@fastmail.com>]

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Leo Famulari <leo@famulari.name> writes:

> This patch adds Go 1.10 but leaves Go 1.9 as the default Go.
>
> Go 1.10 changes the way that Go decides whether to re-use built objects
> or to recompile them [0]. Reading the release notes, it seems to
> implement something like a memoized cache for built objects and test
> results.
>
> Go 1.10 works with our go-build-system, but the built objects are not
> re-used. Instead, either most or all required objects are rebuilt, so
> the build system will need some adjustment.
>
> I think it's useful to have this new version of Go packaged, especially
> if somebody wants to decipher how the new compiler decides when to
> re-use the built objects :)

Definitely.  Thanks for working on it!  :-)

>
> Also, there is a data race found in the test suite when bootstrapping
> with GCC 5, so this patch changes the entire Go stack to GCC 6. I'll
> send a report upstream.
>
> [0] The "build cache" is mentioned in the link below. The mechanism is
> called "content-based staleness" in some places.
> https://golang.org/doc/go1.10#build

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