"no buildable Go source files in... " from cross compile

[mxseev]

I try compile windows app in linux, and get this error:
[ralvke@localhost client]$ GOOS=windows GOARCH=amd64 go build -o windows.exe ../../github.com/google/gxui/drivers/gl/blitter.go:11:2: no buildable Go source files in /home/ralvke/Documents/Go/src/github.com/go-gl/gl/v2.1/gl ../../github.com/google/gxui/drivers/gl/driver.go:14:2: no buildable Go source files in /home/ralvke/Documents/Go/src/github.com/go-gl/glfw/v3.1/glfw

[dmitshur]

You might need to set CGO_ENABLED=1 (possibly during your Go installation too), since both those packages use cgo.

The docs on cgo state:

To enable cgo during cross compiling builds, set the CGO_ENABLED environment variable to 1 when building the Go tools with make.bash. Also, set CC_FOR_TARGET to the C cross compiler for the target. CC will be used for compiling for the host.

I'm not sure if cross compilation is supported for those packages, but this would be the first step to try.

[zhangpy]

I have same issue on ubuntu 14.04.
When I set CGO_ENABLED=1, I got

# runtime/cgo
gcc: error: unrecognized command line option ‘-mthreads’

I didn't find good solution, so I decided to install in windows.
I install mingw-w64 on windows and compile gxui successfully. FYI.

[ben-clayton]

I'm afraid there's little I can do to help with this issue, as the problem seems to be with cross-compilation and/or go-gl. I'd recommend raising a bug there if your problem persists.

[EX0l0N]

When you use CGO_ENABLED=1 you also have to set CC and CXX to windows C(++) cross compilers. If you don't you'll be building and linking with your default host compilers.
You'll need some C(++) cross compiler suite to be installed.

I don't know if CXX_FOR_TARGET exists, or if it's being used, but setting it won't hurt.

# runtime/cgo
gcc: error: unrecognized command line option ‘-mthreads’

Is a typical exception you get for using the hosts gcc. -mthreads is a windows only gcc option.

I'm using
CC=x86_64-w64-mingw32-gcc CXX=x86_64-w64-mingw32-g++ CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -v