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20a10e7ddd
This CL introduces the bootstrap requirement that in order to build the current release (or development version) of Go, you need an older Go release (1.4 or newer) already installed. This requirement is the whole point of this CL. To enforce the requirement, convert cmd/dist from C to Go. With this bootstrapping out of the way, we can move on to replacing other, larger C programs like the Go compiler, the assemblers, and the linker. See golang.org/s/go15bootstrap for details. Change-Id: I53fd08ddacf3df9fae94fe2c986dba427ee4a21d Reviewed-on: https://go-review.googlesource.com/2470 Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Rob Pike <r@golang.org>
28 lines
1.3 KiB
Plaintext
28 lines
1.3 KiB
Plaintext
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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