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Date: Sun, 16 Oct 2011 18:31:15 +0200
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Subject: Re: [gentoo-user] How to cross compile Perl for ARM?
From: czernitko <czernitko@gmail.com>
To: gentoo-user@lists.gentoo.org
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Hi Leho!
Thanks for many links, Jude Pereira's work totally missed my search results.
In fact I focused on playing with Qemu. First approach was to emulate whole
board (using qemu-system-arm) which works so far best of all, but is
painfully slow (but not more than other options). As for chrooted
environment, I used armv5tel stage3 tarballs available at my university
site:
http://ftp.fi.muni.cz/pub/linux/gentoo/releases/arm/autobuilds/current-stage3-armv5tel/-
it is one of official gentoo mirrors and stage3 tarball contains
everything necessary already compiled, including fully operational perl
5.12.3. I had no problems emerging any other packages, but as I said,
compilation takes ages.
Then I tried to move contents of my emulated folder to my ARM target machine
and on the machine try to chroot inside it. No problem with
compiling/emerging in chrooted environment directly on target machine, but
speed is maybe even lower.
The last approach I tried was using binfmt support to be able to run arm
binaries on my x64 box without the necessity to emulate whole board - I
hoped to have much better performance than when using qemu-system-arm.
Unfortunately it seems that qemu-arm does not support some system calls or
whatever. I untared stage3 on my x64 machine, chrooted into the folder and
tried running emerge - simple arm binaries were running fine, but emerge
ended with errors like "qemu: Unsupported syscall: 242"...
And last of all, I started documenting my approach on google sites:
https://sites.google.com/site/czernitko/cross-compilation/cross-compiling-perl-for-arm-architecture
Peter
2011/10/16 Leho Kraav <leho@kraav.com>
> i have managed to cross-compile a pretty complete stage3 for arm i believe
> with perl-5.10.1 from
> http://git.overlays.gentoo.org/gitweb/?p=proj/embedded-cross.git;a=tree;f=dev-lang/perl
>
> overall the cross-compile experience was a nightmare, esp. re perl and
> python. many packages obscurely fail, but not enough for you to immediately
> give up. so it keeps sucking you back in and waste even more time. at the
> time i discovered that embedded-cross overlay had mostly done all the
> difficult work for me, but it seems it is no longer updated for recent
> stuff. i think guys in #gentoo-embedded told me it is a lot of effort to
> patch these large packages like perl and python to sanely cross-compile, and
> since i think their product thing didn't work out too well, they weren't
> going to sink any more time into maintaining for newer versions.
>
> but jude pereira i believe is doing something with arm stages at least
> semi-actively
> http://judepereira.com/blog/gentoo-linux-uclibc-stage3-2010-for-embedded/and it is definitely a lot of fun booting pretty much full blown gentoo on
> things like Nokia N8x0 internet tablets
> https://github.com/slonopotamus/n8x0-overlay
>
>
--bcaec548a3a7e72b4504af6d040d
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Hi Leho!<br>Thanks for many links, Jude Pereira's work totally missed m=
y search results. <br>In fact I focused on playing with Qemu. First approac=
h was to emulate whole board (using qemu-system-arm) which works so far bes=
t of all, but is painfully slow (but not more than other options). As for c=
hrooted environment, I used armv5tel stage3 tarballs available at my univer=
sity site: <a href=3D"http://ftp.fi.muni.cz/pub/linux/gentoo/releases/arm/a=
utobuilds/current-stage3-armv5tel/">http://ftp.fi.muni.cz/pub/linux/gentoo/=
releases/arm/autobuilds/current-stage3-armv5tel/</a> - it is one of officia=
l gentoo mirrors and stage3 tarball contains everything necessary already c=
ompiled, including fully operational perl 5.12.3. I had no problems emergin=
g any other packages, but as I said, compilation takes ages.<br>
<br>Then I tried to move contents of my emulated folder to my ARM target ma=
chine and on the machine try to chroot inside it. No problem with compiling=
/emerging in chrooted environment directly on target machine, but speed is =
maybe even lower.<br>
<br>The last approach I tried was using binfmt support to be able to run ar=
m binaries on my x64 box without the necessity to emulate whole board - I h=
oped to have much better performance than when using qemu-system-arm. Unfor=
tunately it seems that qemu-arm does not support some system calls or whate=
ver. I untared stage3 on my x64 machine, chrooted into the folder and tried=
running emerge - simple arm binaries were running fine, but emerge ended w=
ith errors like "qemu: Unsupported syscall: 242"...<br>
<br>And last of all, I started documenting my approach on google sites: <a =
href=3D"https://sites.google.com/site/czernitko/cross-compilation/cross-com=
piling-perl-for-arm-architecture">https://sites.google.com/site/czernitko/c=
ross-compilation/cross-compiling-perl-for-arm-architecture</a><br>
<br>Peter<br><br><div class=3D"gmail_quote">2011/10/16 Leho Kraav <span dir=
=3D"ltr"><<a href=3D"mailto:leho@kraav.com">leho@kraav.com</a>></span=
><br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex;">
i have managed to cross-compile a pretty complete stage3 for arm i believe =
with perl-5.10.1 from <a href=3D"http://git.overlays.gentoo.org/gitweb/?p=
=3Dproj/embedded-cross.git;a=3Dtree;f=3Ddev-lang/perl" target=3D"_blank">ht=
tp://git.overlays.gentoo.org/gitweb/?p=3Dproj/embedded-cross.git;a=3Dtree;f=
=3Ddev-lang/perl</a><br>
<br>
overall the cross-compile experience was a nightmare, esp. re perl and pyth=
on. many packages obscurely fail, but not enough for you to immediately giv=
e up. so it keeps sucking you back in and waste even more time. at the time=
i discovered that embedded-cross overlay had mostly done all the difficult=
work for me, but it seems it is no longer updated for recent stuff. i thin=
k guys in #gentoo-embedded told me it is a lot of effort to patch these lar=
ge packages like perl and python to sanely cross-compile, and since i think=
their product thing didn't work out too well, they weren't going t=
o sink any more time into maintaining for newer versions.<br>
<br>
but jude pereira i believe is doing something with arm stages at least semi=
-actively <a href=3D"http://judepereira.com/blog/gentoo-linux-uclibc-stage3=
-2010-for-embedded/" target=3D"_blank">http://judepereira.com/blog/gentoo-l=
inux-uclibc-stage3-2010-for-embedded/</a> and it is definitely a lot of fun=
booting pretty much full blown gentoo on things like Nokia N8x0 internet t=
ablets <a href=3D"https://github.com/slonopotamus/n8x0-overlay" target=3D"_=
blank">https://github.com/slonopotamus/n8x0-overlay</a><br>
<br>
</blockquote></div><br>
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