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cmd/go: --buildmode plugin fails: cannot handle R_TLS_IE #17415

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rogpeppe opened this issue Oct 12, 2016 · 5 comments
Closed

cmd/go: --buildmode plugin fails: cannot handle R_TLS_IE #17415

rogpeppe opened this issue Oct 12, 2016 · 5 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.8Maybe

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

go version devel +2287296 Wed Oct 12 08:03:00 2016 +0000 linux/amd64

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

GOARCH="amd64"
GOOS="linux"
GOPATH="/home/rog/src/go"
GOTOOLDIR="/home/rog/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build045198637=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"

What did you do?

go build -buildmode plugin tst.go

where tst.go was:

package main
func main() {}
var Foo = 99

What did you expect to see?

A built plugin binary.

What did you see instead?

# command-line-arguments
2016/10/12 10:58:11 cannot handle R_TLS_IE (sym runtime.memhash8) when linking internally
@ianlancetaylor ianlancetaylor added this to the Go1.8Maybe milestone Oct 12, 2016
@ianlancetaylor
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I think the bug here is that the error message is not very good.

A plugin that does not export any symbols, which requires using import "C", is not very useful.

@quentinmit
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@ianlancetaylor Where does this use import "C"? I see an exported symbol, "Foo".

@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 12, 2016
@ianlancetaylor
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I'm sorry, you're right, I got confused between this and -buildmode=c-shared.

Seems like -buildmode=plugin needs to force an external link, probably by changing mustLinkExternal in cmd/link/internal/ld/config.go.

@crawshaw
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Agreed. Sending a CL.

@gopherbot
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CL https://golang.org/cl/30933 mentions this issue.

@golang golang locked and limited conversation to collaborators Oct 12, 2017
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@rogpeppe @quentinmit @crawshaw @ianlancetaylor @gopherbot