Progress:
I assumed that I could use so I jumped
to https://github.com/golang/go/wiki/GccgoCrossCompilation#symlink and
followed those instructions. I then compiled with gcc, gccgo, and ar all
symlinked to a place in my $PATH that occurs before the non-mips gcc etc
programs.
After compiling by running
$ gccgo -Wall -o hello-sym hello.go -static-libgo
then running *hello-sym* on the target system, I get this error:
*can't load library 'libgo.so.7'*
Helpfully, in it says that I can compile the binary statically "by adding
the *-static* switch to gccgo".
Perfect! So then I compiled with
$ gccgo -Wall -o hello-sym-static hello.go -static-libgo -static
scp'd the resulting *hello-sym-static* binary to the target machine, and
run it. The result?
$ ./hello-sym-static
Segmentation fault
Any idea what could be causing the segfault? (hello.go is a trivial
"Hello, world!" program.)
On the target (mips) device, I see files like /lib/libuClibc-0.9.33.2.so,
with /lib/libc.so.0 being a symlink to /lib/libuClibc-0.9.33.2.so, in case
that's relevant.
Thanks!
--Steve
On Friday, February 10, 2017 at 7:58:58 PM UTC-8, Steve Phillips wrote:
>
> I should add that my target device's kernel doesn't have FPU (floating
> point) emulation, nor does it have a hardware FPU, and I therefore can't
> just use go1.8r3's easy-to-use mips support; already tried it.
>
> --Steve
>
>
> On Friday, February 10, 2017 at 7:56:40 PM UTC-8, Steve Phillips wrote:
>>
>> > Yes, crosscompiling to mips with gccgo has worked for a while.
>>
>> I'm having trouble getting this to work. I got gccgo-mips-linux-gnu to
>> produce binaries, but the target machine doesn't have the right shared
>> libraries to run them; I get *"can't load library 'libm.so.6'"* when
>> trying to execute the built binary (here's that thread
>> <https://github.com/golang/go/issues/18942>).
>>
>> In another thread I saw Dave Cheney tell people to cp -r $GOROOT to
>> another place (call it ~/xgo), touch all the files in ~/xgo/src, make sure
>> GOROOT isn't set, then run the following:
>>
>> $ go build -o xgo -compiler gccgo -x cmd/go
>>
>> This isn't producing a *xgo* binary at all. Also, running
>>
>> $ GOOS=linux GOARCH=mips go build -o xgo -compiler gccgo -x cmd/go
>>
>> also generates no *xgo *binary.
>>
>> Third attempt: https://github.com/golang/go/wiki/GccgoCrossCompilation
>> makes it sounds like I should use crosstool-ng to build a version of GCC
>> for my target architecture (mips), but can't I just use gccgo-mips-linux-gnu
>> somehow?
>>
>> Some of these instructions are from 2 years ago, so at this point I don't
>> know what will work now, in 2017.
>>
>> Any help would be great! Thanks.
>>
>> --Steve
>>
>>
>> On Thursday, May 21, 2015 at 12:53:38 AM UTC-7, andrewc...@gmail.com
>> wrote:
>>>
>>> Yes, crosscompiling to mips with gccgo has worked for a while. There are
>>> issues with cross compiling and the bundled go tool. If you know how, you
>>> can work around it.
>>>
>>> On Thursday, May 21, 2015 at 7:43:22 PM UTC+12, Ganbold Tsagaankhuu
>>> wrote:
>>>>
>>>>
>>>>
>>>> On Thu, May 21, 2015 at 12:03 PM, <andrewc...@gmail.com> wrote:
>>>>
>>>>> Ok, Just confirming this, I will work on a patch that makes cross
>>>>> compiling work, and make the GOARCH default to whatever gcc was built for.
>>>>>
>>>>
>>>> Nice. So if gcc 5.x can be cross compiled for mips then for now maybe
>>>> it is better for me just to try to cross compile gcc on Linux and then try
>>>> to compile Go program for mips platform.
>>>>
>>>> Ganbold
>>>>
>>>>
>>>>
>>>>>
>>>>>
>>>>> On Thursday, May 21, 2015 at 2:21:57 PM UTC+12, andrewc...@gmail.com
>>>>> wrote:
>>>>>>
>>>>>> Ok, I think I found a bug in the build scripts.
>>>>>>
>>>>>> This check is wrong imo.
>>>>>>
>>>>>> https://github.com/gcc-mirror/gcc/blob/gcc-5_1_0-release/gotools/configure.ac#L49
>>>>>>
>>>>>> This doesn't currently make sense, NATIVE is always true. We aren't
>>>>>> cross compiling the compiler itself.
>>>>>>
>>>>>> https://github.com/gcc-mirror/gcc/blob/gcc-5_1_0-release/gotools/Makefile.am#L31
>>>>>>
>>>>>>
>>>>>> And I think we should implement this:
>>>>>>
>>>>>> https://github.com/gcc-mirror/gcc/blob/gcc-5_1_0-release/gotools/Makefile.am#L128
>>>>>>
>>>>>> Should I make a thread on golang-dev for this? I think we could make
>>>>>> cross compiling using gccgo pretty nice which means people will use
>>>>>> gccgo
>>>>>> for most embedded things.
>>>>>> With this I can get gccgo added to crosstool-ng, openwrt and
>>>>>> buildroot I think.
>>>>>>
>>>>> --
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>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>
>>>>
>>>>
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