Distcc/Cross-Compiling/fr

Ce guide vous explique comment configurer distcc pour la compilation croisée à travers différentes architectures de processeur.

Introduction
is a tool that lets you share the burden of software compiling across several networked computers. As long as the networked boxes are all using the same toolchain built for the same processor architecture, no special setup is required.

This guide provides instructions on how to configure distcc to compile for different architectures.

Installer les utilitaires nécessaires
First, you will need to emerge on all the machines that will be involved in the compiling process. is a tool that makes building cross-architecture toolchains easy. Its usage is straightforward: will build a full cross-toolchain targeting the Sparc architecture. This includes binutils, gcc, glibc, and linux-headers.

You will need to emerge the proper cross-toolchain on all the helper boxes. If you need more help, try running.

Si vous voulez régler finement la chaine de compilation croisée (cross-toolchain), voici un script qui produira une ligne de commande avec la version exacte du paquet de développement croisé à construire sur les machines assistantes (le script est à exécuter depuis la machine cible).

Next, you will need to emerge on all the machines that will be involved in the process. This includes the box that will run emerge and the boxes with the cross-compilers. Please see the Gentoo Distcc Documentation for more information on setting up and using.

Intel x86 sub-architectures
If you are cross-compiling between different subarchitectures for Intel (e.g. i586 and i686), you must still build a full cross-toolchain for the desired CHOST, or else the compilation will fail. This is because i586 and i686 are actually different CHOSTs, despite the fact that they are both considered "x86." Please keep this in mind when you build your cross-toolchains. For example, if the target box is i586, this means that you must build i586 cross-toolchains on your i686 helper boxes.

SPARC
Using might fail with one of the following errors:

Si cela vous arrive, essayez la commande suivante à la place de la précédente :

Configurer distcc pour des compilations croisées correctes
In the default distcc setup, cross-compiling will not work properly. The problem is that many builds just call instead of the full compiler name (e.g. ). When this compile gets distributed to a distcc helper box, the native compiler gets called instead of your shiny new cross-compiler.

Fortunately, there is a workaround for this little problem. All it takes is a wrapper script and a few symlinks on the box that will be running. We'll use a Sparc box as an example. Wherever you see  below, you will want to insert your own CHOST value (  for an AMD64 box, for example). When you first emerge distcc, the directory looks like this:

Voici ce que vous devez faire :

Next, we'll create the new script on this box. Fire up your favorite editor and create a file with the following text in it, then save it as. Remember to change the CHOST value (in this case, ) to the actual CHOST of the box that will be running the emerge.

Ensuite, nous allons rendre le script exécutable et créer les liens symboliques corrects :

Voilà, c'est terminé. devrait ressemble à ceci :

Ensuite nous devons nous assurer que ces enveloppes restent disponibles après la mise à jour du paquet distcc car il écrase les liens symboliques. Nous pouvons le faire grâce au fichier qui ressemble à ceci :

Then create this file:

Give it the proper permissions:

Félicitations ! Vous disposez maintenant d'une configuration distcc avec compilation croisée fonctionnelle.

Comment ça marche
When is called, it checks to see what it was called as (e.g. ,  , etc.) When distcc then distributes the compile to a helper box, it passes along the name it was called as. The distcc daemon on the other helper box then looks for a binary with that same name. If it sees just, it will look for , which is likely to be the native compiler on the helper box, if it is not the same architecture as the box running. When the full name of the compiler is sent (e.g. ), there is no confusion.

Dépannage
This section covers a number of common problems when using for cross-compiling.

COMPILE ERRORS sur l’hôte distccd distant
When receiving the message  within a remote host's  file, see the above notes concerning specifying the correct architecture name (ie. ).

Another solution is to uninstall and re-install compiler tools, using the  option, or ensuring  no longer exists, and then completely reinstall the cross compiler.

It might also be wise to edit the remote host's, and ensure the contents of the CFLAGS variable are similar on all computers or hosts performing compiler operations. Also make sure the USE flags for the cross compiler are sufficient: if you built GCC with  on the client, you need a line like   in  too.

Failed to exec $TARGET-unknown-linux-gnu-gcc: No such file or directory
Il est possible que le script d'emballage (wrapper) ne parvienne pas à s’exécuter, même avec les bonnes permissions :

Pour résoudre ceci, assurez vous d'avoir créé le script d'emballage (wrapper) en utilisant le nom complet de l'architecture cible: