Difference between revisions of "Create Debian sysroots"

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== Introduction ==
 
== Introduction ==
  
We'll create Debian sysroots suitable for a GCC cross compiler.
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We'll create Debian sysroots suitable for a [[Linux/amd64 GCC 8.3.0 cross-compiler instructions | GCC cross compiler]].
  
== Prerequisites ==
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== Debootstrap machine ==
  
[[Debian Linux Post Install Steps| Debian]] or [[Ubuntu Linux Post Install Steps | Ubuntu].
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Everything below runs on the '''debootstrap machine''' as root:
  
==
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sudo -i
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 +
=== Prerequisites ===
 +
 
 +
[[Debian Linux Post Install Steps| Debian]] or [[Ubuntu Linux Post Install Steps | Ubuntu]] or any system that can run [https://wiki.debian.org/Debootstrap debootstrap], with a configured QEMU user emulator. In practice only Debian and Ubuntu will work.
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 +
=== Install debootstrap and associated tools ===
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apt install -y binfmt-support qemu qemu-user-static debootstrap
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=== Run debootstrap ===
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<nowiki>mkdir -p /tmp/sysroots
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cd /tmp/sysroots
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arches="amd64,x86_64-linux-gnu arm64,aarch64-linux-gnu mips,mips-linux-gnu mips64el,mips64el-linux-gnuabi64 ppc64el,powerpc64le-linux-gnu"
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for arch in $arches; do IFS=","; set $arch; qemu-debootstrap --arch "$1" --variant=buildd stable "$2" http://deb.debian.org/debian; unset IFS; done</nowiki>
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 +
=== Fix symlinks ===
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 +
Debootstrap will create absolute symlinks, fix absolute symlinks to refer to the sysroot dir by changing them into relative symlinks.
 +
 
 +
for arch in $arches; do IFS=","; set $arch; find "$2" -type l -lname '/*' -exec sh -c 'file="$0"; dir=$(dirname "$file"); target=$(readlink "$0"); prefix=$(dirname "$dir" | sed 's@[^/]*@\.\.@g'); newtarget="$prefix$target"; ln -snf $newtarget $file' {} \; ; unset IFS; done
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 +
== Host machine ==
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=== Create directories ===
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cd $HOME
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arches="x86_64-linux-gnu aarch64-linux-gnu mips-linux-gnu mips64el-linux-gnuabi64 powerpc64le-linux-gnu"
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for arch in $arches; do mkdir -p $HOME/cross/sysroot/$arch/{lib,usr/{include,lib}}; done
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=== Copy sysroots ===
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for arch in $arches; do for dir in /lib/ /usr/{include,lib}; do rsync -a ubuntu.local:/tmp/sysroots/$arch/$dir/ $HOME/cross/sysroot/$arch$dir; done; done
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 +
== Debootstrap machine (again) ==
 +
 
 +
=== Cleanup ===
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 +
Still as root:
 +
 
 +
rm -rf /tmp/sysroots
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== See also ==
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 +
* [https://wiki.debian.org/Debootstrap debootstrap]
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* [https://www.debian.org/ports Debian ports]

Latest revision as of 14:55, 24 November 2019


Introduction

We'll create Debian sysroots suitable for a GCC cross compiler.

Debootstrap machine

Everything below runs on the debootstrap machine as root:

sudo -i

Prerequisites

Debian or Ubuntu or any system that can run debootstrap, with a configured QEMU user emulator. In practice only Debian and Ubuntu will work.

Install debootstrap and associated tools

apt install -y binfmt-support qemu qemu-user-static debootstrap

Run debootstrap

mkdir -p /tmp/sysroots
cd /tmp/sysroots
arches="amd64,x86_64-linux-gnu arm64,aarch64-linux-gnu mips,mips-linux-gnu mips64el,mips64el-linux-gnuabi64 ppc64el,powerpc64le-linux-gnu"
for arch in $arches; do IFS=","; set $arch; qemu-debootstrap --arch "$1" --variant=buildd stable "$2" http://deb.debian.org/debian; unset IFS; done

Fix symlinks

Debootstrap will create absolute symlinks, fix absolute symlinks to refer to the sysroot dir by changing them into relative symlinks.

for arch in $arches; do IFS=","; set $arch; find "$2" -type l -lname '/*' -exec sh -c 'file="$0"; dir=$(dirname "$file"); target=$(readlink "$0"); prefix=$(dirname "$dir" | sed 's@[^/]*@\.\.@g'); newtarget="$prefix$target"; ln -snf $newtarget $file' {} \; ; unset IFS; done

Host machine

Create directories

cd $HOME
arches="x86_64-linux-gnu aarch64-linux-gnu mips-linux-gnu mips64el-linux-gnuabi64 powerpc64le-linux-gnu"
for arch in $arches; do mkdir -p $HOME/cross/sysroot/$arch/{lib,usr/{include,lib}}; done

Copy sysroots

for arch in $arches; do for dir in /lib/ /usr/{include,lib}; do rsync -a ubuntu.local:/tmp/sysroots/$arch/$dir/ $HOME/cross/sysroot/$arch$dir; done; done

Debootstrap machine (again)

Cleanup

Still as root:

rm -rf /tmp/sysroots

See also