cmd/go: unable to build package which references identifiers in file named update_linux.go

[joelklint]

Go version

go version go1.23.3 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/firefox/Library/Caches/go-build'
GOENV='/Users/firefox/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/firefox/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/firefox/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.23.3/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.23.3/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.23.3'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/firefox/Library/Application Support/go/telemetry'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/firefox/git/personal/golang-filename-update-linux/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/1h/b9zf9dwx6ts9941yxfllt_b00000gn/T/go-build4286075515=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Create a file named update_linux.go in a package. Create a constant in that file. Reference that constant from another file within the same package. Now build the package by using a shell to navigate to the folder of the package and invoking go build .

Repo with reproducible example: https://github.com/joelklint/golang-filename-update-linux

What did you see happen?

Command invocation

go build .

stdout

# example.com/example
./main.go:4:10: undefined: msg

Exit code

1

What did you expect to see?

Command invocation

go build .

stdout

Exit code

0

[gabyhelp]

Related Issues

• cmd/go, cmd/cgo: “ build constraints exclude all Go files“ error #39398 (closed)
• cmd/compile: internal compiler error: missing pkg #56186 (closed)
• x/build: Strange behavior with a particular file name #69722 (closed)
• cmd/cgo: cgo + static const int results in "undefined reference" on linux #40820
• cmd/go: build panics when passed `="` as build path #49137
• cmd/go: improve error when a package exists in the filesystem but is in a different module #30590 (closed)
• build go from source failed on macos #36397 (closed)
• cmd/compile: GOEXPERIMENT=unified on macOS fails fixedbugs/issue27836.go #53954 (closed)
• cmd/go: go work causes go build to error when symlinks are involved #53343
• main.main: relocation target mypkg/pkg.Test[go.shape.int_0] not defined #49524 (closed)

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[seankhliao]

https://pkg.go.dev/cmd/go#hdr-Build_constraints

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