GOARCH=arm support.

[minhajakhterkhan199]

I am getting below error, after downloading (go get -u github.com/go-gl/gl/v{3.2,3.3,4.1,4.2,4.3,4.4,4.5}-{core,compatibility}/gl)

# github.com/go-gl/gl/v3.2-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v3.3-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v3.2-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.1-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v3.3-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.1-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.2-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.3-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.2-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.4-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.3-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.5-core/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.4-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'
# github.com/go-gl/gl/v4.5-compatibility/gl
arm-linux-gnueabi-gcc: error: unrecognized command line option '-m64'

My development machine is Ubuntu 16.04 amd64 and target is arm. Please advise to solve this issue

[dmitshur]

My development machine is Ubuntu 16.04 amd64 and target is arm.

Target is arm? Can you elaborate?

I don't think targeting arm architecture is supported by go-gl/gl packages.

You may want to consider golang.org/x/mobile/gl and github.com/goxjs/gl packages, which do support iOS and Android (which are arm targets).

[minhajakhterkhan199]

Development Machine is Ubuntu 16.04 amd64 and Target machine is Raspberry Pi 3, Please advise to solve the issue

export GOOS=linux
export GOARCH=arm
export CC=arm-linux-gnueabi-gcc
export CGO_ENABLED=1

[dmitshur]

I know goxjs/gl does not support Raspberry Pi, see issue goxjs/gl#13 that's tracking it. I don't know what the support status for x/mobile/gl is, but it seems more likely that it doesn't either. That support needs to be implemented by someone.

[kivutar]

How would you estimate the amount of work to add ARM support to go-gl/gl?

[dmitshur]

Most of the work would be figuring out why it doesn't work, and what needs to be done to make it work. It's hard to estimate it other by starting to do it and seeing how it goes.

I think most ARM-based platforms support only OpenGL ES, not OpenGL, so this is most likely only relevant to the github.com/go-gl/glfw/v3.1/gles2 package.

Also, in case it's helpful, see https://hackernoon.com/barriers-to-effective-software-effort-estimation-and-how-to-avoid-them-4abd39f09f26.

[kivutar]

@dmitshur I've been able to compile a go-gl/gl + go-gl/glfw app yesterday on the raspberry without issue.

I've not yet been able to get it display something yet, I still have to learn how to configure the context properly (RPi only support OpenGL up to 2.1).

But I can tell that the issue with CFLAGS -m64 only happens when cross compiling. So the amount of work may not be too important.

[pwaller]

Thanks for the update. Please keep letting us know, I'll keep this issue open until someone reports success at getting this working.

[kivutar]

It's working. This is a working example https://github.com/libretro/ludo/blob/master/.travis.yml#L37-L59

[pwaller]

@kivutar - great news. Is there any action to take over on this repository?

[kivutar]

@pwaller No, as you can see in my go.mod I'm using the unmodified go-gl code. I think that installing the right dependencies for the right architecture is what made the difference for the cross compilation.

Building directly on an ARM system was straightforward.