Hi, I've been testing docker with upstream go, and ever since this cgo patch
89ff0b1, I've been unable to build the docker binaries.

The problem looks cgo related and I've created a small test below that can reproduce the issue.

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

go 1.8.1 compiles without an error
upstream go since 89ff0b1 fails to compile

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

Fails on x86_64 as well, is easily reproducible below as long as you have the right linux header or ran in a container.

GOARCH="ppc64le"
GOBIN=""
GOEXE=""
GOHOSTARCH="ppc64le"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_ppc64le"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build967771292=/tmp/go-build -gno-record-gcc-switches"
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"

What did you do?

I was running docker CI with upstream go, but this should make the issue reproducible

package main

/*
#include <linux/fs.h>
struct fsxattr {
        __u32           fsx_xflags;
        __u32           fsx_extsize;
        __u32           fsx_nextents;
        __u32           fsx_projid;
        unsigned char   fsx_pad[12];
};
#ifndef FS_IOC_FSGETXATTR
#define FS_IOC_FSGETXATTR               _IOR ('X', 31, struct fsxattr)
#endif
*/
import "C"
import (
        "fmt"
)

func main() {
        fmt.Println("Hello, playground")
        fmt.Println(C.FS_IOC_FSGETXATTR)
        fmt.Println("done")
}

What did you expect to see?

Hello, playground
"somenumbers"
done

What did you see instead?

could not determine kind of name for C.FS_IOC_FSGETXATTR

Any ideas would be helpful, Thanks!