x/mobile: Undefined symbols for architecture arm64

[Higher08]

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

$ go version
go1.16.4 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

$ go env
GO111MODULE="auto"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/dmytro/Library/Caches/go-build"
GOENV="/Users/dmytro/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/dmytro/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/dmytro/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16.4"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/86/5nplq84x6jl50czmncxkdqph0000gn/T/go-build543195465=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Build GOlang project with gomobile bind, import framework into iOS app and build it

What did you expect to see?

Launched app)

What did you see instead?

Undefined symbols for architecture arm64:
  "operator new(unsigned long)", referenced from:
      struct_utp_context::struct_utp_context() in Server(000033.o)
      _utp_init in Server(000033.o)
      _utp_create_socket in Server(000036.o)
  "___gxx_personality_v0", referenced from:
      struct_utp_context::struct_utp_context() in Server(000033.o)
      struct_utp_context::~struct_utp_context() in Server(000033.o)
      _utp_init in Server(000033.o)
      _utp_destroy in Server(000033.o)
      UTP_FreeAll(UTPSocketHT*) in Server(000036.o)
      _utp_create_socket in Server(000036.o)
      _utp_check_timeouts in Server(000036.o)
      ...
  "operator delete(void*)", referenced from:
      struct_utp_context::struct_utp_context() in Server(000033.o)
      struct_utp_context::~struct_utp_context() in Server(000033.o)
      _utp_init in Server(000033.o)
      _utp_destroy in Server(000033.o)
      UTP_FreeAll(UTPSocketHT*) in Server(000036.o)
      _utp_create_socket in Server(000036.o)
      _utp_check_timeouts in Server(000036.o)
      ...
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation

[mengzhuo]

Could you elaborate on the code example?

[Higher08]

Code of usage in iOS app or GOlang code?

[Higher08]

I think it's happening because of this library https://github.com/anacrolix/go-libutp. And it seems that the clang compiler doesn't understand some functions in it. Is there a way to fix it?

[Higher08]

@mengzhuo

[mengzhuo]

I think it's happening because of this library https://github.com/anacrolix/go-libutp. And it seems that the clang compiler doesn't understand some functions in it. Is there a way to fix it?

I DO NOT think it's a bug.

According to your environment settings:

GO111MODULE="auto"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/dmytro/Library/Caches/go-build"
GOENV="/Users/dmytro/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"

You may want to set GOARCH=arm64 to do cross compile.
And maybe it's related to #47212

p.s. Github issue is not a place for question you should ask it at Go-nuts

[Higher08]

@mengzhuo, perhaps it was not clear from the description, but the build problem is in the Xcode. gomobile bind runs fine. If I remove this library from my golang project, the ios application starts

[gopherbot]

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