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cmd/go: cgo build results depend on random tmp path #81040
Description
Go version
go version go1.27rc2 linux/amd64
Output of go env in your module/workspace:
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE=''
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN='/root/go/bin'
GOCACHE='/root/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/root/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1852580478=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/dev/null'
GOMODCACHE='/root/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPACKAGESDRIVER=''
GOPATH='/root/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/lib64/go/1.27'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/root/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOTOOLDIR='/usr/lib64/go/1.27/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.27rc2'
GOWORK=''
PKG_CONFIG='pkg-config'What did you do?
I'm working on reproducible builds for openSUSE, I found that
our esbuild-0.28.2 package varies across builds, unless LTO is disabled.
What did you see happen?
cgo uses a random /tmp/go-buildNNNN path and that gets embedded into debuginfos.
What did you expect to see?
Build results should be deterministic and bit-reproducible.
A gcc16 patch is only half of the solution.
Activity
cmd/go: use Objdir-relative paths in cgo compile action IDs
gopherbot commentedon Aug 23, 2026
Change https://go.dev/cl/819900 mentions this issue:
cmd/go: use Objdir-relative paths in cgo compile action IDsgabyhelp commentedon Aug 23, 2026
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dr2chase commentedon Aug 28, 2026
@golang/go-command