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cmd/go: -buildmode=plugin generated Go archive, not ELF shared object #22656

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kidinamoto01 opened this issue Nov 10, 2017 · 3 comments
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cmd/go: -buildmode=plugin generated Go archive, not ELF shared object #22656

kidinamoto01 opened this issue Nov 10, 2017 · 3 comments
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@kidinamoto01
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kidinamoto01 commented Nov 10, 2017 •
edited by ALTree
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Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.9 linux/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/suyu/go"
GORACE=""
GOROOT="/home/suyu/.gvm/gos/go1.9"
GOTOOLDIR="/home/suyu/.gvm/gos/go1.9/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build725236087=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

What did you do?

go get -u github.com/whyrusleeping/gx
go get -u github.com/whyrusleeping/gx-go

gx-go rw
gx install --global

go build -buildmode=plugin -o=ethereum.so
mv ethereum.so ~/.ipfs/plugins/
chmod +x ~/.ipfs/plugins/ethereum.so
ipfs daemon

What did you expect to see?

ipfs should be started.

What did you see instead?

error message

Error: loading plugin /home/suyu/ipfs/data/plugins/ethereum.so: plugin.Open: /home/ipfs//plugins/ethereum.so: invalid ELF header

readelf -h ethereum.so

File: ethereum.so(__.PKGDEF )
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

File: ethereum.so(go.o )
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start
@ianlancetaylor ianlancetaylor changed the title invalid ELF header in build output cmd/go: -buildmode=plugin generated Go archive, not ELF shared object Nov 10, 2017
@ianlancetaylor
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I don't see how this is possible. Are you absolutely certain that you are looking at the same ethereum.so file in both cases? Can you show us the output of go build -buildmode=plugin -x -o=ethereum.so?

@ALTree
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ALTree commented Nov 10, 2017

Take this file:

$ cat test.go 
package p

import "fmt"

func main() {
	fmt.Println("hi")
}

If you run go build -buildmode=plugin, gc complains:

$ go build -buildmode=plugin
-buildmode=plugin requires exactly one main package

but if you use -o, it doesn't:

$ go build -buildmode=plugin -o test.so

A test.so is generated, but it's an archive!

$ file test.so 
test.so: current ar archive

so readelf fails on it:

$ readelf -h test.so 

File: test.so(__.PKGDEF       )
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

File: test.so(_go_.o          )
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

Is this what is happening?

@ianlancetaylor
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@ALTree Thanks for figuring that out. I bet that it is it. I'm going to close this as a dup of #19023, which will be fixed in the 1.10 release.

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@ianlancetaylor @ALTree @gopherbot @kidinamoto01