cgo: duplicate definition linking cgo program with c-archive cgo library #49256
Description
What version of Go are you using (go version)?
$ go version go version go1.17.2 darwin/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
Output
$ go env GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/Users/undefined/Library/Caches/go-build" GOENV="/Users/undefined/Library/Application Support/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GOINSECURE="gitlab.me" GOMODCACHE="/Users/undefined/go/pkg/mod" GONOPROXY="code.aliyun.com,gitlab.me" GONOSUMDB="code.aliyun.com,gitlab.me" GOOS="darwin" GOPATH="/Users/undefined/go" GOPRIVATE="code.aliyun.com,gitlab.me" GOPROXY="https://mirrors.aliyun.com/goproxy/,direct" GOROOT="/usr/local/go" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64" GOVCS="" GOVERSION="go1.17.2" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/dev/null" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/k5/x_cn68sn66756hdl_ngxghz40000gn/T/go-build2988694177=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
//hello.go
package main
import "C"
import "fmt"
func main() {
// Hello("hello")
}
//export Hello
func Hello() {
fmt.Println("output:")
}
//run.go
package main
/*
#include "libhello.h"
#cgo CFLAGS: -I./dist/
#cgo LDFLAGS: -L./dist/ -lhello
*/
import "C"
func main() {
C.Hello()
}
step1
go build --buildmode=c-archive -o ./dist/libhello.so hello.go
step2
go run run.go
What did you expect to see?
output:
What did you see instead?
duplicate symbol '__cgo_panic' in:
$WORK/b001/_cgo_main.o
./dist/libhello.so(go.o)
duplicate symbol '__cgo_topofstack' in:
$WORK/b001/_cgo_main.o
./dist/libhello.so(go.o)
duplicate symbol '_crosscall2' in:
$WORK/b001/_cgo_main.o
./dist/libhello.so(go.o)
duplicate symbol '__cgo_wait_runtime_init_done' in:
$WORK/b001/_cgo_main.o
./dist/libhello.so(000006.o)
ld: 4 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)