Cross compilation macos -> linux doesn't work

[bobrik]

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

$ go version
go version go1.9.4 darwin/amd64

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

$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/bobrik/cf-repos/els"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.9.4/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.9.4/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/xv/lkn605ns2c7fy9vtkz49dhcr0000gn/T/go-build106115125=/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?

$ GOOS=linux go install -v github.com/DataDog/zstd

What did you expect to see?

Succesful compilation with no errors

What did you see instead?

github.com/DataDog/zstd
go build github.com/DataDog/zstd: build constraints exclude all Go files in /tmp/dd/src/github.com/DataDog/zstd

It works just fine if I compile on linux directly or on macos directly, but not with cross-compilation.

[Viq111]

Hi @bobrik
This library is actually a cgo wrapper over the official C library so you will need to have a linux C toolchain installed on your build environment.

I haven't done any cgo cross-compilation myself but a quick google search yields https://github.com/karalabe/xgo