Re: PowerPC & GNU/Hurd cross-compilation

[Carlos Sánchez de La Lama]

Hi Ludo, all,

>> $ file $(./pre-inst-env guix build -q --target=powerpc-linux-gnu guile 
>> )/bin/guile
>> The following files will be downloaded:
>>    /gnu/store/4cmc36jhjj2qq7z5pd0n9fw48dfq1cr7-guile-2.0.13-debug
>>    /gnu/store/h153jzzqiz10xc3yh4r2w7lkrm5pbx88-guile-2.0.13
>>    /gnu/store/253hrca11y3cjh2f83dcjaxiv9a2j5m3-gmp-6.1.2
>>    /gnu/store/29iq9axvllgdrf6y6zfqz111icmy3pdj-libgc-7.6.0
>>    /gnu/store/911r5chr83yi6xivavndgb6mcvn71qv1-libunistring-0.9.7
>>    
>> /gnu/store/hkhffl6c6iap2igbbcap2vqbcgh7xkjv-gcc-cross-sans-libc-powerpc-linux-gnu-5.4.0
>>    
>> /gnu/store/k2j02w9q58h6i07y1fixvcdq8jply68i-gcc-cross-powerpc-linux-gnu-5.4.0
>>    /gnu/store/naqawviclvwzixvcjc17c3sss7zj9k1w-readline-7.0
>>    
>> /gnu/store/qivxbbn03scn5wn932ky8mm5xap5zn93-glibc-cross-powerpc-linux-gnu-2.24
>>    /gnu/store/rqb8p9f13mfha1xkkjwf7wfjvzv34xlk-libltdl-2.4.6
>>    /gnu/store/z1qain73n3475p6sdb2ignwyalckvgnx-libffi-3.2.1
>>    /gnu/store/4dazcdvnbgvhdvi5aj17ci07mz1xwzvq-bash-4.4.5
>>    /gnu/store/6fzzsp453p3n5axcnl0rddjf1yw9309m-ncurses-6.0
>>    
>> /gnu/store/r7dbj8y4nf024phn8sd2v4206y71mk8q-pkg-config-powerpc-linux-gnu-0.29
>>    /gnu/store/rbhdn0wkbgb69w17f1fhridw81msam8v-libatomic-ops-7.4.4
>
> With QEMU:
>
> --8<---------------cut here---------------start------------->8---
> $ qemu-ppc /gnu/store/4dazcdvnbgvhdvi5aj17ci07mz1xwzvq-bash-4.4.5/bin/bash 
> --version
> GNU bash, version 4.4.5(1)-release (powerpc-unknown-linux-gnu)
> Copyright (C) 2016 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>
> This is free software; you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> $ qemu-ppc /gnu/store/h153jzzqiz10xc3yh4r2w7lkrm5pbx88-guile-2.0.13/bin/guile 
> -q --version
> qemu: uncaught target signal 11 (Segmentation fault) - core dumped
> --8<---------------cut here---------------end--------------->8---
>
> Carlos, could you check whether the cross-compiled Guile works on a real
> PowerPC machine?  I suspect ‘qemu-ppc’ doesn’t emulate everything libgc
> relies on.

I checked out commit 58ea4d to try to obtain most sustitutes from hydra,
but seems my products differ:

$ ./pre-inst-env guix build -q --target=powerpc-linux-gnu guile
/gnu/store/75vvlackg42i2aisc8zxgvqnkfz3nnx0-guile-2.0.13-debug
/gnu/store/g4q5kgrl8qigzaqlhhg2jjnmzhj75pk7-guile-2.0.13

While, for hydra, products for evaluation 109452 (which uses commit
58ea4d) are:
powerpc-linux-gnu.guile-2.0.13.x86_64-linux:
        /gnu/store/viv5cw795vy7gblgv68k16q4ri37s7aj-guile-2.0.13-debug
        /gnu/store/1zy8jfwbb2g956ihg5d9bk2ac41xhcsc-guile-2.0.13
powerpc-linux-gnu.guile-2.0.13.i686-linux: Fails.

Note I am on i686.
        
In any case, the cross-compiled Guile generated on my machine works on
the real PowerPC:

./pre-inst-env guix gc --references 
/gnu/store/g4q5kgrl8qigzaqlhhg2jjnmzhj75pk7-guile-2.0.13 | xargs tar cf 
~/guile.tar

I scp to ppc machine, untar, and guile works:

--8<---------------cut here---------------start------------->8---
ppc$ /gnu/store/g4q5kgrl8qigzaqlhhg2jjnmzhj75pk7-guile-2.0.13/bin/guile 
--version
guile (GNU Guile) 2.0.13
Copyright (C) 2016 Free Software Foundation, Inc.

License LGPLv3+: GNU LGPL 3 or later
<http://gnu.org/licenses/lgpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
--8<---------------cut here---------------end--------------->8---

BR

Carlos