x/mobile: "URGENT: building for iOS simulator, but linking in object file"

[OpenFibers]

Please answer these questions before submitting your issue. Thanks!

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

1.9.2

Does this issue reproduce with the latest release?

YES

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

macOS x86_64
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/openthread/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.9.2/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/8y/fl7bxlp163b8mtx9_v__6mxm0000gn/T/go-build723202614=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
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?

running gomobile ios demo

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

build hello.framwork, then build xcode project

What did you expect to see?

no warning

What did you see instead?

there is warning "URGENT: building for iOS simulator, but linking in object file (/Users/openthread/go/src/golang.org/x/mobile/example/bind/ios/Hello.framework/Hello(000001.o)) built for OSX. Note: This will be an error in the future."

[bcmills]

CC: @eliasnaur

[bcmills]

build hello.framwork, then build xcode project

More detail would be helpful. What commands did you follow to build hello.framework? What version of Xcode are you using, and what commands did you use to build the Xcode project?

[eliasnaur]

I can't reproduce this with Xcode 9.4.1, Go 1.10.1 and the latest version of gomobile (rev. 6621de06e1e9d52c38a8c542770bdbeac9ecfef6). I built Hello.framework with

$ gomobile bind -target ios golang.org/x/mobile/example/bind/hello

and then I built (and ran) the hello Xcode project on the iPhone SE emulator. The only warning I saw was about updating the project settings.

[OpenFibers]

I was building the hello.framework by running the demo code

gomobile bind -target=ios golang.org/x/mobile/example/bind/hello

gomobile version +6621de0 Mon Jun 18 22:25:54 2018 +0000 (android,ios); androidSDK=

And running iOS demo project in simulator. When build into devices, warning disappears.

[OpenFibers]

after I upgrade to go 1.10.3, remake hello.framework, warnings disappear

[OpenFibers]

@eliasnaur this issue resolved : )
Thank you for your help : )