Re: Bug#827525: kvmtool: FTBFS on mips64el: guest/guest_init.o: linking 32-bit code with 64-bit code

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Hi,

(thanks Riku for forwarding this!)

On 17/06/16 19:31, Riku Voipio wrote:
> On 17 June 2016 at 15:04, Dejan Latinovic <Dejan.Latinovic@xxxxxxxxxx> wrote:
>> Package kvmtool FTBFS for mips64el with the following error:
>>
>>> LINK     lkvm
>>> /usr/bin/ld: guest/guest_init.o: warning: linking abicalls files with non-abicalls files
>>> /usr/bin/ld: guest/guest_init.o: linking 32-bit code with 64-bit code
>>> /usr/bin/ld: failed to merge target specific data of file guest/guest_init.o
>>> collect2: error: ld returned 1 exit status
>>> Makefile:381: recipe for target 'lkvm' failed
>>> make[1]: *** [lkvm] Error 1
>>
>> Full build log:
>> https://buildd.debian.org/status/fetch.php?pkg=kvmtool&arch=mips64el&ver=0.20160419-1&stamp=1463209003
>>
>> The reason for that is behaviour is the way of creation guest_init.o.
>>> ld -r -b binary -o guest/guest_init.o guest/init
>>
>> Resulting file is "MIPS-I" instead of expected "MIPS64 rel2".
>>> file guest/guest_init.o.cp
>>> guest/guest_init.o.cp: ELF 64-bit LSB relocatable, MIPS, MIPS-I version 1 (SYSV), not stripped
>>
>> If options "-r -b binary" are used, linker will ignore flags of input file "Flags: 0x80000006, pic, cpic, mips64r2",
>> and flags of resulting guest_init.o file will be  "Flags: 0x0".
>>
>> Solution for this issue could be using different method for creation guest_init.o.
>> If xxd and gcc are used instead of ld, resulting file will have regular flags.
>>> xxd -i guest/init | $(CC) -c -x c - -o guest/guest_init.o
>> Here are proposed changes for this issue.
>> http://www.spinics.net/lists/kvm/msg118016.html
>>
>> I have created a patch that fixes this issue modeled on mentioned solution.
>> Using this patch I was able to build kvmtool for mips64el, mipsel, i386, amd64.
>> The patch is attached.
>> Could you please consider including this patch.
> 
> I think the patch is better applied directly upstream, I'm sure there
> are non-Debian users who would like to use kvmtool on mips64el.

Dejan, do you have a mean of actually _testing_ this?
I haven't seen a kvmtool/MIPS user for a while (also the build is broken
for ages), so I am curious ...

Let me take a look and revive this old patch, which needs some
adjustments due to the new (pre-)init code.

Cheers,
Andre.
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