Repository: go
Issue: x/mobile/cmd/gomobile: bind  -target=ios app.sdk/lightControl fail
Labels: NeedsInvestigation,mobile

<!-- Please answer these questions before submitting your issue. Thanks! -->

### What version of Go are you using (`go version`)?
go version go1.12.4 darwin/amd64

### Does this issue reproduce with the latest release?
yes, always


### What operating system and processor architecture are y, ou using (`go env`)?
GOARCH="amd64"
GOBIN="/Users/fredlee/Documents/develop/go/workspace/bin"
GOCACHE="/Users/fredlee/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/fredlee/Documents/develop/go/workspace"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
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 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/go-build760905676=/tmp/go-build -gno-record-gcc-switches -fno-common"
<details><summary><code>go env</code> Output</summary><br><pre>
$ go env

</pre></details>

### What did you do?

<!--
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.
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### What did you expect to see?
macbookpro:lightControl fredlee$ gomobile bind -o android/lightControl.aar -target=android app.sdk/lightControl
macbookpro:lightControl fredlee$  gomobile bind -target=ios app.sdk/lightControl

### What did you see instead?
macbookpro:lightControl fredlee$ gomobile bind -o android/lightControl.aar -target=android app.sdk/lightControl
macbookpro:lightControl fredlee$ gomobile bind  -target=ios app.sdk/lightControl
gomobile: darwin-arm: go build -tags ios -buildmode=c-archive -o /var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/lightControl-arm.a gobind failed: exit status 2
 gobind
In file included from LightControl_darwin.m:9:
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:87:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:88:22: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:89:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:90:25: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:95:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:96:26: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:99:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:100:22: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:101:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:102:17: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:109:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:110:19: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:111:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:112:19: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:113:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:114:19: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:115:4: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:116:19: error: expected a type
/var/folders/34/z2z_vp1573g5014m8k7wys100000gn/T/gomobile-work-626724909/src/gobind/LightControl.objc.h:272:4: error: expected a type
fatal error: too many errors emitted, stopping now [-ferror-limit=]