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cmd/go: cannot find package when importing dependencies with the unix build constraint #54712

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wizardishungry opened this issue Aug 28, 2022 · 6 comments
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FrozenDueToAge GoCommand cmd/go NeedsFix The path to resolution is known, but the work has not been done.
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@wizardishungry
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What version of Go are you using (go version)?

$ go version
go version go1.19 linux/amd64

Does this issue reproduce with the latest release?

I don't know if this reproduces in gotip.

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/tmp/go-build-jon"
GOENV="/home/jon/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/jon/.asdf/installs/golang/1.19/packages/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/jon/.asdf/installs/golang/1.19/packages"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/jon/.asdf/installs/golang/1.19/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/jon/.asdf/installs/golang/1.19/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/jon/src/tmp/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2789217673=/tmp/go-build -gno-record-gcc-switches"

What did you do?

https://go.dev/play/p/vhnTI8FhFJE
Doesn't reproduce in the playground.

What did you expect to see?

My program runs.

What did you see instead?

main.go:6:2: cannot find package

If I change unix to linux, it works.
If I remove the build constraint, it works.
If I remove the references to golang.org/x/sync/singleflight, it works.

Per go help buildconstraint:

During a particular build, the following build tags are satisfied:

   - the target operating system, as spelled by runtime.GOOS, set with the
     GOOS environment variable.
   - the target architecture, as spelled by runtime.GOARCH, set with the
     GOARCH environment variable.
   - "unix", if GOOS is a Unix or Unix-like system.
@gopherbot
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Change https://go.dev/cl/426296 mentions this issue: cmd/go/internal/imports: recognize "unix" build tag

@ZekeLu
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ZekeLu commented Aug 28, 2022

It seems that https://go.dev/cl/389934 forgot to change src/cmd/go/internal/imports/build.go, which is copied from src/go/build/build.go, src/go/build/syslist.go. I have sent https://go.dev/cl/426296 to change that file and add a regression test.

@bcmills bcmills added the GoCommand cmd/go label Aug 29, 2022
@bcmills
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bcmills commented Aug 29, 2022

Doesn't reproduce in the playground.

It does if you add a go.mod file with an explicit dependency and a recent go version! 🙂

https://go.dev/play/p/A9PbFemDPD-?v=gotip

@bcmills bcmills added the NeedsFix The path to resolution is known, but the work has not been done. label Aug 29, 2022
@bcmills bcmills added this to the Go1.20 milestone Aug 29, 2022
@bcmills bcmills changed the title build: problem importing go modules when using "unix" build constraint cmd/go: cannot find package when importing dependencies with the unix build constraint Aug 29, 2022
@bcmills
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bcmills commented Aug 29, 2022

@gopherbot, please backport to Go 1.19. This is a subtle bug in a feature introduced in Go 1.19, and the fix in Go 1.20 will mask spurious build failures that users on Go 1.19 will run into.

@gopherbot
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Backport issue(s) opened: #54736 (for 1.19), #54737 (for 1.20).

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

@gopherbot
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Change https://go.dev/cl/426814 mentions this issue: [release-branch.go1.19] cmd/go/internal/imports: recognize "unix" build tag

gopherbot pushed a commit that referenced this issue Aug 30, 2022
…ld tag

For #20322
For #51572
Updates #54712
Fixes #54736

Change-Id: I22fcfa820e83323bfdf1a40deee7286240f02b3e
GitHub-Last-Rev: cd2c653
GitHub-Pull-Request: #54716
Reviewed-on: https://go-review.googlesource.com/c/go/+/426296
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
(cherry picked from commit 3c6a5cd)
Reviewed-on: https://go-review.googlesource.com/c/go/+/426814
Run-TryBot: Bryan Mills <bcmills@google.com>
bradfitz pushed a commit to tailscale/go that referenced this issue Sep 8, 2022
…ld tag

For golang#20322
For golang#51572
Updates golang#54712
Fixes golang#54736

Change-Id: I22fcfa820e83323bfdf1a40deee7286240f02b3e
GitHub-Last-Rev: cd2c653
GitHub-Pull-Request: golang#54716
Reviewed-on: https://go-review.googlesource.com/c/go/+/426296
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
(cherry picked from commit 3c6a5cd)
Reviewed-on: https://go-review.googlesource.com/c/go/+/426814
Run-TryBot: Bryan Mills <bcmills@google.com>
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