go: reduce install footprint

[mascguy (Christopher Nielsen)]

Presently this port installs more than 10,000 files. 7,000+ are source-related, while 2,500+ cover tests:

$ port contents go | wc -l
   10650
$ port contents go | ggrep "/opt/local/lib/go/src" | wc -l
    7232
$ port contents go | ggrep "/opt/local/lib/go/test" | wc -l
    2553

In addition, on Intel, amd64-related binaries - which presumably aren't helpful? - are also installed:

$ port contents go | ggrep "/opt/local/lib/go/pkg/darwin_amd64" | wc -l
     427

Is all of this necessary, for a standard install?

[mascguy (Christopher Nielsen)]

If the sources and tests aren't necessary for dependents, perhaps they could be encapsulated in separate compressed tarballs?

[herbygillot (Herby Gillot)]

Go is a "batteries-included" programming platform, and everything you've listed is needed.

If you download the *official* installer package from ​https://go.dev, you will see that it contains the same, installing everything, including source, tests, and the contents of 'pkg'.

Attempting to mess with the package contents, or trying to partition certain pieces off into separate ports will result in a very bad experience for Go users using MacPorts as compared to other packaging environments, and may even cause Go to fail and malfunction for a sizable number of standard use cases.

Users expect to just install go and see that everything is available and just works.