This program, dist, is the bootstrapping tool for the Go distribution.
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As of Go 1.5, dist and other parts of the compiler toolchain are written
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in Go, making bootstrapping a little more involved than in the past.
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The approach is to build the current release of Go with an earlier one.
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The process to install Go 1.x, for x ≥ 5, is:
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1. Build cmd/dist with Go 1.4.
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2. Using dist, build Go 1.x compiler toolchain with Go 1.4.
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3. Using dist, rebuild Go 1.x compiler toolchain with itself.
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4. Using dist, build Go 1.x cmd/go (as go_bootstrap) with Go 1.x compiler toolchain.
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5. Using go_bootstrap, build the remaining Go 1.x standard library and commands.
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NOTE: During the transition from the old C-based toolchain to the Go-based one,
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step 2 also builds the parts of the toolchain written in C, and step 3 does not
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recompile those.
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Because of backward compatibility, although the steps above say Go 1.4,
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in practice any release ≥ Go 1.4 but < Go 1.x will work as the bootstrap base.
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See golang.org/s/go15bootstrap for more details.
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Compared to Go 1.4 and earlier, dist will also take over much of what used to
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be done by make.bash/make.bat/make.rc and all of what used to be done by
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run.bash/run.bat/run.rc, because it is nicer to implement that logic in Go
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than in three different scripting languages simultaneously.
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