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Re: PowerPC & GNU/Hurd cross-compilation

From: Ludovic Courtès
Subject: Re: PowerPC & GNU/Hurd cross-compilation
Date: Mon, 30 Jan 2017 15:43:41 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Hey Carlos,

address@hidden (Carlos Sánchez de La Lama) skribis:

>>> $ 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 <>
>> 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.

The “.x86_64-linux” in the Hydra job name above means that it’s
cross-built from x86_64; that’s why the store file name is different
from the one you have on i686.

The failure on i686 is a timeout while running libgc’s test suite (the
native i686 build):

--8<---------------cut here---------------start------------->8---
make  check-TESTS
make[2]: Entering directory '/tmp/guix-build-libgc-7.6.0.drv-0/gc-7.6.0'
make[3]: Entering directory '/tmp/guix-build-libgc-7.6.0.drv-0/gc-7.6.0'
PASS: leaktest
PASS: cordtest
PASS: smashtest
PASS: hugetest
PASS: middletest
PASS: threadleaktest
PASS: threadkey_test
PASS: subthreadcreate_test
PASS: initsecondarythread_test
PASS: staticrootstest
PASS: realloc_test
PASS: test_cpp
PASS: disclaim_test
PASS: disclaim_bench
building of `/gnu/store/yk15c9c5vjny19pw30zkygf2vzy6zp7h-libgc-7.6.0.drv' timed 
out after 3600 seconds of silence
--8<---------------cut here---------------end--------------->8---

I’ve just tried:

  ./pre-inst-env guix build -e '(@@ (gnu packages commencement) guile-final)' \
      -s i686-linux -K

on my x86_64 box and it passes without a problem.

Probably that was a transient failure, though we’ll need to pay

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

Awesome, thanks for checking!


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