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cmd/compile: Go 1.22 changes support for modules that declare go 1.0 #65528

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dmitshur opened this issue Feb 5, 2024 · 6 comments
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cmd/compile: Go 1.22 changes support for modules that declare go 1.0 #65528

dmitshur opened this issue Feb 5, 2024 · 6 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FixPending Issues that have a fix which has not yet been reviewed or submitted. NeedsFix The path to resolution is known, but the work has not been done. release-blocker
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@dmitshur
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dmitshur commented Feb 5, 2024

Go version

go version go1.22rc2 darwin/arm64

Output of go env in your module/workspace:

(Shouldn't be relevant; happy to provide otherwise.)

What did you do?

I used a Go 1.22-ish toolchain, instead of a 1.21-ish one, to install the command go.chromium.org/luci/cipd/client/cmd/cipd@latest. It failed because one of its dependencies has a go module directive with an unusually-low value of "1.0" here, reporting a build error as:

# github.com/danjacques/gofslock/fslock
compile: invalid value "go1" for -lang: should be something like "go1.12"

Here's a smaller reproducer:

$ cd $(mktemp -d)
$ go mod init test
$ go get go@1.21 toolchain@none
$ echo 'package p; import _ "github.com/danjacques/gofslock/fslock"' > p.go
$ go get . github.com/danjacques/gofslock@v0.0.0-20230728142113-ae8f59f9e88b

What did you see happen?

$ go test
# github.com/danjacques/gofslock/fslock
compile: invalid value "go1" for -lang: should be something like "go1.12"
FAIL	test [build failed]

$ GOTOOLCHAIN=go1.21.6 go test
?   	test	[no test files]
$ echo $?
0

What did you expect to see?

I'm not sure if this edge-case should work or not.

I read over https://go.dev/doc/toolchain#version, which includes:

The syntax ‘1.N’ is called a “language version”. It denotes the overall family of Go releases implementing that version of the Go language and standard library.

But doesn't seem to specify what the minimum value of N is.

The new go/version package has IsValid, which reports true for "go1.0" and "go1". (https://go.dev/play/p/82xhtZbE9N9?v=gotip)

@bcmills bcmills changed the title cmd/go: Go 1.22 changes support for very old Go language versions cmd/go,cmd/compile: Go 1.22 changes support for modules that declare go 1.0 Feb 5, 2024
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Feb 5, 2024
@bcmills bcmills added the GoCommand cmd/go label Feb 5, 2024
@bcmills
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bcmills commented Feb 5, 2024

Both gover.Lang and version.Lang have tests that a bare "1" is considered a valid language version:

On the other hand, cmd/compile expects to parse the -lang flag using a regular expression:

So I think two things need to happen here:

  1. We should double check (with @rsc) that version.Lang("go1.0") really is intended to be go1 and not go1.0, and
  2. assuming that it is, cmd/compile should be updated so that the -lang flag accepts all versions for which version.Lang(x) == x.

@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Feb 5, 2024
@bcmills bcmills added this to the Go1.23 milestone Feb 5, 2024
@bcmills bcmills added release-blocker and removed GoCommand cmd/go labels Feb 5, 2024
@bcmills bcmills changed the title cmd/go,cmd/compile: Go 1.22 changes support for modules that declare go 1.0 cmd/compile: Go 1.22 changes support for modules that declare go 1.0 Feb 7, 2024
@rsc
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rsc commented Feb 7, 2024

Lang("go1.0") = "go1" is correct; the compiler should accept "go1" in addition what it currently accepts namely "go1.0".

@gopherbot
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Change https://go.dev/cl/562322 mentions this issue: cmd/compile: accept -lang=go1 as -lang=go1.0

@bcmills
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bcmills commented Feb 8, 2024

@gopherbot, please backport to Go 1.22. This was a regression in 1.22.0 and the fix is trivial.

@gopherbot
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Backport issue(s) opened: #65619 (for 1.22).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://go.dev/wiki/MinorReleases.

@dmitshur dmitshur added NeedsFix The path to resolution is known, but the work has not been done. FixPending Issues that have a fix which has not yet been reviewed or submitted. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Feb 8, 2024
@mdempsky
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mdempsky commented Feb 8, 2024

Lang("go1.0") = "go1" is correct; the compiler should accept "go1" in addition what it currently accepts namely "go1.0".

On go.dev/cl/562322, I pointed out that cmd/go does not support "go 1" in go.mod files. @bcmills says this is expected because "go 1.0 is not the canonical name for that version."

I'll also point out that go mod edit -go=1 fails. (Both -toolchain=go1 and -toolchain=go1.0 are supported though.)

If cmd/go won't let its users spell Go language version "1.0" as "1", why did it start spelling "-lang=go1.0" as "-lang=go1"? Why is it cmd/compile's responsibility to now accept either spelling? Can cmd/go instead revert to the original spelling that it still requires from users?

Thanks.

kxxt added a commit to kxxt/gofslock that referenced this issue Feb 11, 2024
Go 1.22 breaks modules that declare go 1.0: golang/go#65528

This PR modifies the Go version in go.mod to 1.14 because
module must run on Go version 1.14 or later, as documented in https://go.dev/doc/modules/gomod-ref
ezz-no pushed a commit to ezz-no/go-ezzno that referenced this issue Feb 18, 2024
Fixes golang#65528.

Change-Id: I55fef8cf7be4654c7242462d45f12999e0c91c02
Reviewed-on: https://go-review.googlesource.com/c/go/+/562322
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Arno500 added a commit to Arno500/plex-richpresence that referenced this issue Feb 19, 2024
bobg added a commit to bobg/mingo that referenced this issue Mar 11, 2024
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