cmd/cgo: Linux arm support

[bradfitz]

Linux/arm lacks cgo.

[davecheney]

Comment 1:

I would be delighted to help with this issue.

[gopherbot]

Comment 2 by stephenm@golang.org:

Owner changed to stephenm@golang.org.

[mattetti]

Comment 3:

It Iooks like currently when building on arm the -m32 flag is passed to gcc and it is
not supported.
Googling for this issue I found this blog post covering the gco/arm issue:
http://river.styx.org/ww/2011/03/godroid

[adg]

Comment 4:

Status changed to Accepted.

[davecheney]

Comment 5:

I've started to address this in http://golang.org/cl/4528124/. CGO doesn't work
at this point, but at least it doesn't blow up passing the wrong -m flags.

[rsc]

Comment 6:

Status changed to HelpWanted.

[rsc]

Comment 7:

Owner changed to @rsc.

[rsc]

Comment 9:

Labels changed: added priority-later.

[minux]

Comment 10:

I'm currently working on this issue.
Progress: 
* I've got 5l to link the first non-trivial dynamic linking Linux/ARM ELF.
* All cgo related runtime function implemented but not tested.

[davecheney]

Comment 11:

Please let me know when you have a CL available. I'd be overjoyed to test this.

[rsc]

Comment 13:

Started by minux.ma:  http://golang.org/cl/5601044/

Status changed to Started.

[gopherbot]

Comment 14 by duzy.chan:

expecting it to be solved

[minux]

Comment 15:

I hope it will be resolved soon.
FYI, I've prepared these 5 CLs to address this issue.
CL 5991065: cmd/5l, cmd/ld: dynamic linking library support
CL 5989057: runtime: cgo support for Linux/ARM
CL 5991066: cmd/cgo: support Linux/ARM
CL 5989058: cmd/go: cgo for Linux/ARM
CL 5988057: go/build: cgo is supported on Linux/ARM

[minux]

Comment 16:

This issue was closed by revision 2bed8a7.

Status changed to Fixed.

[gopherbot]

Comment 17 by hunterling5151:

I meet this problem too,when compile go for arm,there are some problem
eg:# runtime/cgo
cc1: error: unrecognized command line option '-marm'
when compiling finished,cgo.a for arm not creat.

[davecheney]

Comment 18:

@hunterling5151. This issue is closed, please raise a new issue.
Having said that, I believe you are cross compiling from non arm to arm, and your gcc is
complaining because it only known hows to compile for x86/x64. The short answer to this
is, when cross compiling for arm, pass CGO_ENABLED=0 to disable cgo. If you need cgo on
arm, you will have to compile on arm directly.