cmd/link: unknown relocation type 110 (R_LARCH_CALL36) on loong64 with internal linking libgcc.a

[wszqkzqk]

Go version

go version go1.25.1 linux/loong64

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=''
GOARCH='loong64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/build/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/build/.config/go/env'
GOEXE=''
GOEXPERIMENT='nodwarf5'
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -mabi=lp64d -pthread -fmessage-length=0 -ffile-prefix-map=/tmp/go-build965872925=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='loong64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/dev/null'
GOMODCACHE='/build/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/build/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/build/go/src/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/build/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/build/go/src/go/pkg/tool/linux_loong64'
GOVCS=''
GOVERSION='go1.25.1 X:nodwarf5'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

Attempted to build Go from source on Arch Linux for Loong64, of which the gcc is built with -mcmodel=medium.

All tests run, but two specific sub-tests under the "##### Testing cgo" section fail.

The failure occurs in the go tool dist test phase for cgo internal linking tests.

It seems that the internal linker of go doesn't support loong64's medium code model (with relocation R_LARCH_CALL36).

What did you see happen?

The following tests fail with the error:

• go tool dist test -run=^cmd/cgo/internal/test:internal
• go tool dist test -run=^cmd/cgo/internal/test:internal-pie

Error message (from the first failing test):

##### Testing cgo
# go tool dist test -run=^cmd/cgo/internal/test:internal$
`/build/go/src/go/bin/go test -tags=internal -ldflags=-linkmode=internal -count=1 -timeout=30m0s -short cmd/cgo/internal/test`
# cmd/cgo/internal/test.test
/usr/lib/gcc/loongarch64-unknown-linux-gnu/15.2.1/libgcc.a(_absvsi2.o/): unknown relocation type 110; compiled without -fpic?
FAIL    cmd/cgo/internal/test [build failed]
FAIL
2025/09/21 08:27:24 Failed: exit status 1

……

# go tool dist test -run=^cmd/cgo/internal/test:internal-pie$
`/build/go/src/go/bin/go test -tags=internal,internal_pie -ldflags=-linkmode=internal -buildmode=pie -count=1 -timeout=30m0s -short cmd/cgo/internal/test`
# cmd/cgo/internal/test.test
/usr/lib/gcc/loongarch64-unknown-linux-gnu/15.2.1/libgcc.a(_absvsi2.o/): unknown relocation type 110; compiled without -fpic?
FAIL    cmd/cgo/internal/test [build failed]
FAIL
2025/09/21 08:27:24 Failed: exit status 1

What did you expect to see?

All cgo tests, including those using internal linking (-linkmode=internal), should pass successfully with the medium code model. relocation type 110 should be supported.

[gabyhelp]

Related Issues

• cmd/link: need to handle new-style loong64 relocs #63725 (closed)
• cmd/go: internal/test.test build faild on linux/loong64 #67538 (closed)
• cmd/link: need to handle new-style LoongArch relocs #54222 (closed)
• cmd/compile, cmd/link: c-shared not supported on linux/loong64 #53301 (closed)
• cmd/go: TestIssue7573 now fails after commit b488073 #20664 (closed)
• cmd/link: invalid TLS access model used with -buildmode c-shared #53214 (closed)
• cmd/link: support PIE when using the external linker #6940 (closed)
• misc/cgo/test: link failure with atomics on arm64 #58771
• cmd/link: linker fails on linux/amd64 when gcc's lto options are used #58619 (closed)
• cmd/go: TestScripts fail when glibc is included with FLAGS #50985 (closed)

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[xen0n]

Thank you for reporting! We need to implement support for this in loong64's internal linker.

I'm working on implementing the latest LoongArch psABI recently; I expect to have a fix for this in the coming week.