cmd/go: install "-a -buildmode=shared std" not reproducible

[And-ZJ]

Go version

go version devel go1.24-ad6ee21bbf Wed Sep 11 06:30:02 2024 +0000 linux/arm64

Output of go env in your module/workspace:

GO111MODULE='auto'
GOARCH='arm64'
GOBIN=''
GOCACHE='/usr1/GOCACHE'
GOENV='/root/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/usr1/GOPATH/pkg/mod'
GOOS='linux'
GOPATH='/usr1/GOPATH'
GOROOT='/usr1/go'
GOSUMDB='off'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr1/go/pkg/tool/linux_arm64'
GOVCS=''
GOVERSION='devel go1.24-ad6ee21bbf Wed Sep 11 06:30:02 2024 +0000'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/root/.config/go/telemetry'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD=''
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 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2853643470=/tmp/go-build -gno-record-gcc-switches'

What did you do?

$ cd go/

$ go install -a -buildmode=shared std
$ md5sum pkg/linux_arm64_dynlink/libstd.so 
eca98dcf122cb4d23ca1483297b283e0  pkg/linux_arm64_dynlink/libstd.so
$ strings pkg/linux_arm64_dynlink/libstd.so | grep "/tmp"
/tmp/go-build393272947/b301/libstd.so

$ go install -a -buildmode=shared std
$ md5sum pkg/linux_arm64_dynlink/libstd.so 
829d40dfe52515b820f0c9e59529583d  pkg/linux_arm64_dynlink/libstd.so
$ strings pkg/linux_arm64_dynlink/libstd.so | grep "/tmp"
/tmp/go-build649248685/b301/libstd.so

What did you see happen?

The libstd.so file is not reproducible. This problem also exists in earlier versions.

What did you expect to see?

I think the libstd.so file should be reproducible.

[gabyhelp]

Related Issues and Documentation

• cmd/link: go install of shared std fails #39777 (closed)
• cmd/link: error building standard lib using -buildmode=shared Go 1.20rc1 #57334 (closed)
• cmd/link: go install -buildmode=shared -linkshared std doesn't work as expected #28722 (closed)
• x/sys/cpu: `go install -buildmode=shared std` failed #49942 (closed)
• cmd/go: executable created using linkshared option is not linking .so created by buildmode=shared with go modules enabled #38499 (closed)
• cmd/link: CL 20968 breaks go install -buildmode=shared -linkshared std #14963 (closed)
• cmd/go: "read-only file system" with -linkshared even when files are present #47186 (closed)
• cmd/compile: go build -buildmode=c-shared -linkshared produces .so that isn't loadable by dlopen #60957 (closed)
• cmd/go: 'go install -buildmode=shared -linkshared' overwrites files in GOROOT/pkg #28553 (closed)
• cmd/compile: functions are inlined beyond boundary of shared libraries #21510 (closed)

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[gopherbot]

Change https://go.dev/cl/612396 mentions this issue: cmd/go: make sure the linker for shared doesn't include tempdir path

[cagedmantis]

cc @matloob @samthanawalla