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go/doc/next/3-tools.md
qiulaidongfeng 6cd066f8b2 cmd/go: add -changed to query for non-defaults in the env
Fixes #34208

Change-Id: I8ec2d96262dcd7cbf870f6173690143c54190722
GitHub-Last-Rev: 6543df4784
GitHub-Pull-Request: golang/go#65655
Reviewed-on: https://go-review.googlesource.com/c/go/+/563137
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
2024-05-16 14:34:32 +00:00

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Markdown

## Tools {#tools}
### Go command {#go-command}
Setting the `GOROOT_FINAL` environment variable no longer has an effect
([#62047](https://go.dev/issue/62047)).
Distributions that install the `go` command to a location other than
`$GOROOT/bin/go` should install a symlink instead of relocating
or copying the `go` binary.
The new go env `-changed` flag causes the command to print only
those settings whose effective value differs from the default value
that would be obtained in an empty environment with no prior uses of the `-w` flag.
### Vet {#vet}
The `go vet` subcommand now includes the
[stdversion](https://beta.pkg.go.dev/golang.org/x/tools/go/analysis/passes/stdversion)
analyzer, which flags references to symbols that are too new for the version
of Go in effect in the referring file. (The effective version is determined
by the `go` directive in the file's enclosing `go.mod` file, and
by any [`//go:build` constraints](https://pkg.go.dev/cmd/go#hdr-Build_constraints)
in the file.)
For example, it will report a diagnostic for a reference to the
`reflect.TypeFor` function (introduced in go1.22) from a file in a
module whose go.mod file specifies `go 1.21`.
### Cgo {#cgo}