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x/mobile: Undefined symbols _res_9_nclose with Go 1.20 #58416

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xDragonZ opened this issue Feb 8, 2023 · 13 comments
Open

x/mobile: Undefined symbols _res_9_nclose with Go 1.20 #58416

xDragonZ opened this issue Feb 8, 2023 · 13 comments
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Documentation help wanted mobile Android, iOS, and x/mobile NeedsFix The path to resolution is known, but the work has not been done. OS-Darwin
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@xDragonZ
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xDragonZ commented Feb 8, 2023

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

$ go version
go version go1.20 darwin/arm64

Does this issue reproduce with the latest release?

Using MacOS with Go 1.20 error, no issue in 1.19.5

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

go env Output
$ go env
GO111MODULE=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/name/Library/Caches/go-build"
GOENV="/Users/name/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/name/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/name/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.20"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/hr/1lxcf_8s41dfqq139phd6twm0000gn/T/go-build1419606280=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

After compiling using gomobile bind -v -ldflags='-s -w' -target=ios -o libtest.xcframework github.com/example/test in terminal and import the libtest.xcframework library to xcode, it will show error in xcode when trying to compile ios app

What did you expect to see?

What did you see instead?

Undefined symbols for architecture arm64:
"_res_9_nclose", referenced from:
_internal/syscall/unix.libresolv_res_9_nclose_trampoline.abi0 in Libtest(go.o)
"_res_9_ninit", referenced from:
_internal/syscall/unix.libresolv_res_9_ninit_trampoline.abi0 in Libtest(go.o)
"_res_9_nsearch", referenced from:
_internal/syscall/unix.libresolv_res_9_nsearch_trampoline.abi0 in Libtest(go.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Related: #58159

@gopherbot gopherbot added the mobile Android, iOS, and x/mobile label Feb 8, 2023
@gopherbot gopherbot added this to the Unreleased milestone Feb 8, 2023
@bcmills
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bcmills commented Feb 8, 2023

(attn @golang/ios)

@bcmills
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bcmills commented Feb 8, 2023

import the library to xcode

Import how? (Is there something you need to configure in xcode to set the linker flags for the final executable?)

@xDragonZ
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xDragonZ commented Feb 8, 2023

Import xcframework to xcode project target. No, nothing to configure in xcode

@bcmills
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bcmills commented Feb 9, 2023

@xDragonZ, try adding libresolv.9.tbd and/or libresolv.tbd in the Linked Frameworks and Libraries section.
(See https://mozilla.github.io/firefox-browser-architecture/experiments/2017-09-06-rust-on-ios.html.)

@xDragonZ
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xDragonZ commented Feb 9, 2023

Thank you 🫡 finally got it working.

Passing extldflags=-lresolv to gomobile doesn't works but adding libresolv.tbd able to compile the ios app without error now.

@bcmills
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bcmills commented Feb 9, 2023

Great! Want to send a CL to update the documentation?
(Probably goes in one of the files in https://cs.opensource.google/go/x/mobile/+/master:cmd/gomobile/ ..?)

@bcmills bcmills added Documentation help wanted NeedsFix The path to resolution is known, but the work has not been done. labels Feb 9, 2023
@gurupras
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Could you please share how you got this working? Running into the same issue and somehow adding libresolv.tbd and libresolv.9.tbd (for me it shows under Apple SDK and not IOS SDK; not sure if that matters) does nothing.

@xDragonZ
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@gurupras you need to add it to "Frameworks & Libraries" section too

@drew-512
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drew-512 commented Mar 16, 2023

Hi friends,

Not clear if downstream now has to deal with this from now on, or if this will be addressed upstream (making many gophers happy).

@tmm1
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tmm1 commented Apr 12, 2023

Adding to Frameworks & Libraries wasn't working for me. I had to go to Build Phases > Link Libraries and add it there

ricoberger added a commit to kubenav/kubenav that referenced this issue May 2, 2023
Update the used Flutter version to 3.7.12 and update all Flutter
dependencies.

Notes:
- We also had to add the "libresolv.tbd" file in the "Frameworks and
  Libraries" section, see golang/go#58416
- For the Android version of the app we have to use a version of
  gomobile which includes the following patch:
  golang/mobile#91
ricoberger added a commit to kubenav/kubenav that referenced this issue May 2, 2023
Update the used Flutter version to 3.7.12 and update all Flutter
dependencies.

Notes:
- We also had to add the "libresolv.tbd" file in the "Frameworks and
  Libraries" section, see golang/go#58416
- For the Android version of the app we have to use a version of
  gomobile which includes the following patch:
  golang/mobile#91
@yulianaboglione
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Hola puedes dejar lo
Pasos que hiciste plis???
Tengo el mismo problema y no entiendo bien lo qué hay que hacer por favor necesito saber qué fue lo que hizo

bassosimone added a commit to ooni/probe-ios that referenced this issue Jul 24, 2023
Part of ooni/probe#2503

While there, update GitHub actions versions, update Xcode version, and make sure we explicitly link with `libresolv.tbd` to address golang/go#58416.
@monkeyWie
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Any updates?

@dreacot
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dreacot commented Jan 10, 2024

include -tags=netgo while compiling
e.g
gomobile bind -v -tags=netgo -ldflags='-s -w' -target=ios -o libtest.xcframework

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