ios/arm64 executable: must specify a minimum supported OS version.

[enty8080]

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

$ go version
go version go1.16beta1 darwin/arm64

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=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/enty8080/Library/Caches/go-build"
GOENV="/Users/enty8080/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/enty8080/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="ios"
GOPATH="/Users/enty8080/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="go1.16beta1"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="0"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/mp/l216mspj1r793n3f2zhh8vg40000gn/T/go-build2420543642=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

On my Mac:

# export GOOS=ios
# export GOARCH=arm64
# go build main.go

What did you expect to see?

I expected to executable successfully executed in my jailbroken iOS terminal.

What did you see instead?

On my iOS device:

$ ./main
dyld: MH_EXECUTE binaries must specify a minimum supported OS version
Abort trap 6

iOS: 13.3.3 (arm64)
macOS: Big Sur

[mengzhuo]

cc @cherrymui

[dmitshur]

Have you considered using the gomobile tool to build the binary, instead of the go tool directly? gomobile is higher level and should address this kind of issue.

If you’re using go build directly, does it help if you set CGO_CFLAGS=-miphoneos-version-min=10.0 (and possibly also CGO_CXXFLAGS, CGO_LDFLAGS)?

[gopherbot]

Change https://golang.org/cl/280313 mentions this issue: cmd/link/internal: specify LC_VERSION_MIN_IPHONEOS for iOS builds

[eliasnaur]

@enty8080 does CL 280313 linked above work for you?

[enty8080]

@dmitshur gomobile does not works for me. It returns: can't find package command-line-tools.

[enty8080]

@eliasnaur Yes, when this (https://golang.org/cl/280313) will be added?

[enty8080]

@eliasnaur @dmitshur @cherrymui Also look at this please #43378

[eliasnaur]

@eliasnaur Yes, when this (https://golang.org/cl/280313) will be added?

Go is in a freeze for Go 1.16, so it's up to the release team to decide whether something like CL 280313 should go in 1.16 or 1.17.

[enty8080]

@eliasnaur Also I faced this error:

root@Ivans-Air work # ls
build.sh	main.go
root@Ivans-Air work # CGO_ENABLED=1 GOOS=ios GOARCH=amd64 go build main.go 
# runtime/cgo
gcc_darwin_amd64.c:62:15: error: unknown token in expression
<inline asm>:1:12: note: instantiated into assembly here
gcc_darwin_amd64.c:62:15: error: invalid operand
<inline asm>:1:12: note: instantiated into assembly here
root@Ivans-Air work # ls
build.sh	main.go

Solution from #43343 not works for me.

For ios/arm64 works well.

[cherrymui]

See https://tip.golang.org/misc/ios/README . Does it work with GOOS=ios GOARCH=arm64 CGO_ENABLED=1 CC=$(go env GOROOT)/misc/ios/clangwrap.sh go build (or amd64)? Thanks.

[enty8080]

@cherrymui yes it compiles successfully with this clangwrap. Thanks. But there is another problem with MH_EXECUTE

$ ./main
dyld: MH_EXECUTE binaries must specify a minimum supported OS version
Abort trap 6

[cherrymui]

@enty8080 What platform you are targeting, arm64 or amd64? How do you run the binary? Does the output binary has an LC_VERSION_MIN_IPHONEOS load command? (you can see it by running otool -l <binary> | grep VERSION_MIN) Thanks.

[enty8080]

@cherrymui Sorry, I tested old binary. Now it works fine. Thanks.

NOTE: On iOS device before running executable you should ldid -S <file> or Killed: 9 error appears.

[enty8080]

@cherrymui Close issue?

[cherrymui]

@enty8080 thanks for confirming! Yeah, we can close this. I'll see if I can make it better documented.

NOTE: On iOS device before running executable you should ldid -S or Killed: 9 error appears.

@eliasnaur do you think there is anything actionable for Go about this? Thanks.

[eliasnaur]

@cherrymui, would you like to review https://go-review.googlesource.com/c/go/+/280313/? Porbably not for Go 1.16, but good for when GOOS=ios can produce working internally linked binaries.

[dmitshur]

Is it better/easier to document this somewhere, or update the gomobile build subcommand to perform this step and point people to use it?

As far as I can tell, the main purpose of gomobile build is to create functional iOS/Android applications. If it's no longer suitable for that purpose, perhaps we should consider making it clear that it's deprecated/non-functional and point to a better alternative (e.g., using the go command with additional documented steps).

[eliasnaur]

@dmitshur gomobile can produce mobile applications with gomobile build, however that mode is very limited. It's primary use is for generating convenient bridges from Go to ObjC/Swift and Java with the gomobile bind mode.

So I think it's a mistake to consider gomobile the way to build for mobile. For example, Gio doesn't use gomobile at all.

EDIT: It is true that go build binaries are of limited use on mobile platforms. However, that's caused by the dominant use-cases on mobile (apps with GUIs) rather than a fundamental issue with the go tool.

[dmitshur]

@eliasnaur Thanks. I've edited my comment above to clarify it's specifically about gomobile's build subcommand.

[cherrymui]

@cherrymui, would you like to review https://go-review.googlesource.com/c/go/+/280313/? Porbably not for Go 1.16, but good for when GOOS=ios can produce working internally linked binaries.

Done. Yeah, it will be needed when we enable internal linking for ios.

[gopherbot]

Change https://golang.org/cl/280154 mentions this issue: doc/go1.16: reference misc/ios/README for how to build iOS programs

[gopherbot]

Change https://golang.org/cl/280153 mentions this issue: misc/ios: add to README how to build ios executables