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plugin: doc example doesn't work #17693

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aclements opened this issue Oct 31, 2016 · 1 comment
Closed

plugin: doc example doesn't work #17693

aclements opened this issue Oct 31, 2016 · 1 comment
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Go1.8

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@aclements
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What did you do?

Attempted to use the example from the plugin package documentation to try it out:

cat >x.go <<EOF
package main

// // No C code needed.
import "C"

import "fmt"

var V int

func F() { fmt.Println("Hello, number %d", V) }
EOF
cat >y.go <<EOF
package main

import "plugin"

func main() {
	_, err := plugin.Open("x.so")
	if err != nil {
		panic(err)
	}
}
EOF
go build -buildmode=plugin x.go
go run y.go

What did you expect to see?

Nothing.

What did you see instead?

panic: plugin.Open: could not find symbol V: /home/austin/tmp/x.so: undefined symbol: x.V

goroutine 1 [running]:
panic(0x49ce40, 0xc42000c1a0)
	/home/austin/go.dev/src/runtime/panic.go:531 +0x1cf
main.main()
	/home/austin/tmp/y.go:8 +0x63
exit status 2

System details

go version devel +f135106 Sun Oct 30 19:14:08 2016 +0000 linux/amd64
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/austin/r/go"
GORACE=""
GOROOT="/home/austin/go.dev"
GOTOOLDIR="/home/austin/go.dev/pkg/tool/linux_amd64"
TERM="dumb"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build979699063=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
uname -sr: Linux 4.2.0-42-generic
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.5 LTS
Release:	14.04
Codename:	trusty
/lib/x86_64-linux-gnu/libc.so.6: GNU C Library (Ubuntu EGLIBC 2.19-0ubuntu6.9) stable release version 2.19, by Roland McGrath et al.
gdb --version: GNU gdb (GDB) 7.9-gg19
@aclements aclements added this to the Go1.8 milestone Oct 31, 2016
@crawshaw
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This was fixed in 9da7058, which your toolchain is two commits behind.

@golang golang locked and limited conversation to collaborators Oct 31, 2017
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@crawshaw @aclements @gopherbot