Distcc/Cross-Compiling/ru

Данное руководство покажет, как настроить distcc для кросс-компиляции между различными архитектурами процессоров.

Введение
— это инструмент, который позволяет распределить компиляцию программ по нескольким компьютерам в сети. Если соединенные по сети машины используют один toolchain и имеют одинаковую процессорную архитектуру, то для работы никаких особенных настроек не потребуется.

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

Устанавливаем необходимые утилиты
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.

Если вы хотите произвести более точную настройку cross-toolchain’а, то вот скрипт, который генерирует команду с точными версиями toolchain-пакетов для сборки на вспомогательных машинах (скрипт нужно запускать на целевой машине).

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.

Подархитектуры Intel x86
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:

Если это происходит, попробуйте использовать другую команду:

Настройка distcc для корректной кросс-компиляции
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:

Проделаем следующие шаги:

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.

Далее, сделаем скрипт исполнимым и создадим соответствующие символьные ссылки:

После этого будет выглядеть следующим образом:

Далее нужно позаботиться о том, чтобы обертки оставались доступными после обновлений distcc, поскольку символьные ссылки при обновлении перезаписываются. Можно сделать это с помощью файла, примерно такого:

Then create this file:

Give it the proper permissions:

Поздравляем! Теперь у вас (надеемся) есть работающая установка cross-distcc.

Как это работает
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.

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

Remote host distccd COMPILE ERRORS
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.

Failed to exec $TARGET-uknown-linux-gnu-gcc: No such file or directory
The wrapper scripts might fail to execute, even with correct permissions:

To resolve this, make sure to have the wrapper script created with the complete name of the architecture target: