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docs: cross-compile: add useful "apt" and "dnf" builddep commands

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These have been tested only with x86_64->i686 cross-compilation but I
don't see why they couldn't work with other architectures if/when Linux
distributions support them. For at least x86_64->i686 cross-compilation,
these commands save an enormous amount of time.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31945>
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Marc Herbert
2024-11-01 15:03:34 -07:00
committed by Marge Bot
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@@ -484,6 +484,31 @@ of those, as they'll have the right values for your system:
- `meson-cross-x86-linux-gnu <https://aur.archlinux.org/packages/meson-cross-x86-linux-gnu>`__
- `meson-cross-aarch64-linux-gnu <https://github.com/dcbaker/archlinux-meson-cross-aarch64-linux-gnu>`__
Cross-compilation requires cross-compiled versions of the same build
dependencies listed at the top of this page.
On Debian, Ubuntu and similar, the command ``sudo apt-rdepends
--build-depends --follow=DEPENDS mesa`` provides a complete and
up-to-date list of all build dependencies. Append the ``:i386`` suffix
(or your desired architecture) to package names and install the ones you
need like this: ``sudo apt install libwayland-dev:i386 libelf-dev:i386
...``
On Fedora and similar, try ``sudo setarch i686 dnf builddep mesa``. If
that fails, ``sudo dnf builddep mesa`` prints all native dependencies
even when they are already installed. Replace the ``.x86_64`` suffix
with ``.686`` (or your desired architecture) and install the ones you
need.
You do not need a cross-compiled version of the dependencies like
``python3``, ``bison``, ``flex``, ``bindgen``,... that are *used only at
build time*. Some unnecessary ones may even confuse your system
configuration. Also, remember that some dependencies are optional
depending on how you configure your ``meson setup ...`` command - this
is not specific to cross-compilation; see details above. So you may want
to proceed with trial-and-error and install only cross-compiled packages
needed to fix build error messages.
32-bit build on x86 linux:
.. code-block:: ini