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cmd/build: 'GOOS=ios go build' will also include darwin code #59789

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awsong opened this issue Apr 24, 2023 · 2 comments
Closed

cmd/build: 'GOOS=ios go build' will also include darwin code #59789

awsong opened this issue Apr 24, 2023 · 2 comments
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@awsong
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awsong commented Apr 24, 2023 •
edited

What version of Go are you using (go version)?

$ go version
go version go1.20.3 darwin/arm64

Does this issue reproduce with the latest release?

Yes

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

go env Output
$ go env
GO111MODULE=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/wsong/Library/Caches/go-build"
GOENV="/Users/wsong/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/wsong/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/wsong/go"
GOPRIVATE=""
GOPROXY="https://goproxy.cn"
GOROOT="/opt/homebrew/Cellar/go/1.20.3/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/opt/homebrew/Cellar/go/1.20.3/libexec/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.20.3"
GCCGO="gccgo"
AR="ar"
CC="cc"
CXX="c++"
CGO_ENABLED="1"
GOMOD="/tmp/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 -fdebug-prefix-map=/var/folders/lr/s8_5072s6cs602ksv8tv5myh0000gn/T/go-build3771226631=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I intend to compile some code that include only ios implementation, and excluding darwin implementation.
But I found when I give GOOS=ios my darwin code is also compiled in.

I created a minimal demo folder like this

$ ls
test.go         test_darwin.go  test_ios.go

If I run go list with GOOS=dardwin, I get

$GOOS=darwin go list -f '{{.GoFiles}}' 
[test.go test_darwin.go]

If I run go list with GOOS=ios, I get

$ GOOS=ios go list -f '{{.GoFiles}}' 
[test.go test_darwin.go test_ios.go]

What did you expect to see?

$ GOOS=ios go list -f '{{.GoFiles}}' 
[test.go test_ios.go]

What did you see instead?

$ GOOS=ios go list -f '{{.GoFiles}}' 
[test.go test_darwin.go test_ios.go]
@rittneje
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This is mentioned in the docs. https://pkg.go.dev/cmd/go

Using GOOS=ios matches build tags and files as for GOOS=darwin in addition to ios tags and files.

You'll need to add a //go:build !ios directive at the top of these files if you want to exclude them.

@awsong
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awsong commented Apr 24, 2023

I see. I thought all OS types are mutually exclusive.

Thanks for the info.

@awsong awsong closed this as completed Apr 24, 2023
@golang golang locked and limited conversation to collaborators Apr 23, 2024
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