runtime/cgo: cross compile with cgo for target ARM64/linux fails

[ggeh]

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

$ go version
go version go1.10.1 linux/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
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/qbox/gopath"
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
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"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build660351216=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I want to cross compile a package for arm64/linux. But I have met some problems.
I can reproduce the problem with a short code blow.

test.go

package main

//int pt(){
// return 1;
//}
import "C"
import "fmt"

func main(){
	fmt.Println(C.pt());
}

I ran env CGO_ENABLED=1 GOOS=linux GOARCH=arm64 go build test.go
And then I got the blow output:

# runtime/cgo
gcc_arm64.S: Assembler messages:
gcc_arm64.S:27: Error: no such instruction: `stp x19,x20,[sp,'
gcc_arm64.S:28: Error: no such instruction: `stp x21,x22,[sp,'
gcc_arm64.S:29: Error: no such instruction: `stp x23,x24,[sp,'
gcc_arm64.S:30: Error: no such instruction: `stp x25,x26,[sp,'
gcc_arm64.S:31: Error: no such instruction: `stp x27,x28,[sp,'
gcc_arm64.S:32: Error: no such instruction: `stp x29,x30,[sp,'
gcc_arm64.S:33: Error: too many memory references for `mov'
gcc_arm64.S:35: Error: too many memory references for `mov'
gcc_arm64.S:36: Error: too many memory references for `mov'
gcc_arm64.S:37: Error: too many memory references for `mov'
gcc_arm64.S:39: Error: no such instruction: `blr x20'
gcc_arm64.S:40: Error: no such instruction: `blr x19'
gcc_arm64.S:42: Error: no such instruction: `ldp x29,x30,[sp],'
gcc_arm64.S:43: Error: no such instruction: `ldp x27,x28,[sp],'
gcc_arm64.S:44: Error: no such instruction: `ldp x25,x26,[sp],'
gcc_arm64.S:45: Error: no such instruction: `ldp x23,x24,[sp],'
gcc_arm64.S:46: Error: no such instruction: `ldp x21,x22,[sp],'
gcc_arm64.S:47: Error: no such instruction: `ldp x19,x20,[sp],'

And then I tried to install gcc-arm-linux-gnueabihf package.
Then I ran the command env CGO_ENABLED=1 GOOS=linux GOARCH=arm64 CC=arm-linux-gnueabihf-gcc go build test.go
And I got the output below:

# runtime/cgo
In file included from _cgo_export.c:3:0:
cgo-gcc-export-header-prolog:25:14: error: size of array '_check_for_64_bit_pointer_matching_GoInt' is negative

What did you expect to see?

I want to cross compile successfully for ARM64/linux

What did you see instead?

I have posted the details of the error output above~

[andybons]

@ianlancetaylor is there an arm-specific owner I should point this to?

[ianlancetaylor]

If you want to cross-compile with CGO_ENABLED=1, you must have a cross-compiler from your system to arm64-linux-gnu, and you must set the CC_FOR_TARGET environment variable to that cross-compiler. You are trying to build arm64 code with an x86 assembler, which can't work.

Closing because there is nothing we can change in the Go tools to fix this.

[Escalion]

Hi Ian - I'm having a similar issue except I am defining CC_FOR_TARGET (although I've probably got it wrong)

CGO_ENABLED=1 GOOS=linux GOARCH=arm64 CC_FOR_TARGET=gcc-aarch64-linux-gnu go build -buildmode=plugin -o out-linux-arm64/module/module.so module/module.go

And I checked the corss tools are installed:

➜  sudo apt install gcc-aarch64-linux-gnu
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gcc-aarch64-linux-gnu is already the newest version (4:8.3.0-1ubuntu1.2).

However I still get:

eginning build for linux - arm64
# runtime/cgo
gcc_arm64.S: Assembler messages:
gcc_arm64.S:27: Error: no such instruction: `stp x19,x20,[sp,'
gcc_arm64.S:28: Error: no such instruction: `stp x21,x22,[sp,'
gcc_arm64.S:29: Error: no such instruction: `stp x23,x24,[sp,'
gcc_arm64.S:30: Error: no such instruction: `stp x25,x26,[sp,'
gcc_arm64.S:31: Error: no such instruction: `stp x27,x28,[sp,'
gcc_arm64.S:32: Error: no such instruction: `stp x29,x30,[sp,'
gcc_arm64.S:33: Error: too many memory references for `mov'
gcc_arm64.S:35: Error: too many memory references for `mov'
gcc_arm64.S:36: Error: too many memory references for `mov'
gcc_arm64.S:37: Error: too many memory references for `mov'
gcc_arm64.S:39: Error: no such instruction: `blr x20'
gcc_arm64.S:40: Error: no such instruction: `blr x19'
gcc_arm64.S:42: Error: no such instruction: `ldp x29,x30,[sp],'
gcc_arm64.S:43: Error: no such instruction: `ldp x27,x28,[sp],'
gcc_arm64.S:44: Error: no such instruction: `ldp x25,x26,[sp],'
gcc_arm64.S:45: Error: no such instruction: `ldp x23,x24,[sp],'
gcc_arm64.S:46: Error: no such instruction: `ldp x21,x22,[sp],'
gcc_arm64.S:47: Error: no such instruction: `ldp x19,x20,[sp],'

Any pointers would be much appreciated. Thanks

[ianlancetaylor]

@Escalion This issue was closed almost a year ago. The best way to report a problem is to open a new issue, and the best way to ask for help is to use a forum. See https://golang.org/wiki/Questions. Thanks.

In your case my first guess would be that you didn't set the CC environment variable to the cross-compiler.

[Escalion]

@ianlancetaylor - no problem I will remember this for next time. Adding CC=aarch64-linux-gnu-gcc resolved my issue. Thank you!