golang/go

cmd/link: linking a c-shared archive into a Go program fails on Darwin

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#29,061 opened on Dec 1, 2018

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NeedsInvestigationOS-Darwinhelp wanted

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Description

Please answer these questions before submitting your issue. Thanks!

What did you do?

I tried to rebuild the latest tip version with all.bash on my Mac.

What did you expect to see?

No error.

What did you see instead?

$ git rev-parse HEAD
b397248168fcb26400ac6afb88bf6080497a819e

##### ../misc/cgo/testcshared
--- FAIL: TestGo2C2Go (4.85s)
    cshared_test.go:616: run: [go build -buildmode=c-shared -o /var/folders/pb/c7_4_d355ng5zfm4r_jg2gg00000gn/T/cshared-TestGo2C2Go380654146/libtestgo2c2go.dylib go2c2go/go]
    cshared_test.go:641: run: [go build -o /var/folders/pb/c7_4_d355ng5zfm4r_jg2gg00000gn/T/cshared-TestGo2C2Go380654146/m1 go2c2go/m1]
    cshared_test.go:642: command failed: [/var/folders/pb/c7_4_d355ng5zfm4r_jg2gg00000gn/T/cshared-TestGo2C2Go380654146/m1]
        signal: abort trap
        dyld: Library not loaded: libtestgo2c2go.dylib
          Referenced from: /var/folders/pb/c7_4_d355ng5zfm4r_jg2gg00000gn/T/cshared-TestGo2C2Go380654146/m1
          Reason: image not found
        
FAIL
2018/12/02 08:32:51 Failed: exit status 1

Does this issue reproduce with the latest release (go1.11.2)?

N/A

System details

go version devel +b397248168 Sat Dec 1 17:31:02 2018 +0000 darwin/amd64
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/yoshiki/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/yoshiki/gocode:/Users/yoshiki/exercises/gpl:/Users/yoshiki/oak"
GOPROXY=""
GORACE=""
GOROOT="/Users/yoshiki/tools/go"
GOTMPDIR=""
GOTOOLDIR="/Users/yoshiki/tools/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
GOROOT/bin/go version: go version devel +b397248168 Sat Dec 1 17:31:02 2018 +0000 darwin/amd64
GOROOT/bin/go tool compile -V: compile version devel +b397248168 Sat Dec 1 17:31:02 2018 +0000
uname -v: Darwin Kernel Version 18.2.0: Fri Oct  5 19:41:49 PDT 2018; root:xnu-4903.221.2~2/RELEASE_X86_64
ProductName:	Mac OS X
ProductVersion:	10.14.1
BuildVersion:	18B75
lldb --version: lldb-1000.0.38.2
  Swift-4.2

Contributor guide

Research direction
Investigate why dyld cannot find libtestgo2c2go.dylib at runtime. This is likely related to the test binary not setting the correct rpath or the dylib not being in a standard location. Check the test infrastructure for c shared archives on Darwin, specifically how the test sets up the shared library path.
Tech stack
go
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
GocgomacOS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30