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docs: Document 32-bit support policy

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Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Fixes: #3477
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Philip Withnall 2024-10-18 13:59:23 +01:00
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docs/supported-platforms.md
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@ -88,7 +88,25 @@ a fallback to a POSIX-specified approach, if possible, or to simply replace a
given functionality with a no-op, but even this may not be possible in cases of
critical functionality.
Specific notes
32-bit support
---
GLib will support 32-bit systems as long as they are supported by any of the
tested platforms above. This means we are guaranteed to be able to test our
32-bit build in CI.
In particular, Debian
[continues to support 32-bit installations on x86](https://lists.debian.org/debian-devel-announce/2023/12/msg00003.html)
as containers or chroots, though it doesn’t support running on 32-bit physical
x86 hardware. It also supports a 32-bit armhf kernel and userspace.
As of 2024, other known significant consumers of 32-bit GLib are:
* [GStreamer on 32-bit Windows](https://gitlab.gnome.org/GNOME/glib/-/issues/3477#note_2235483)
* [GStreamer on 32-bit armv7](https://gitlab.gnome.org/GNOME/glib/-/issues/3477#note_2236548)
* [Wine](https://gitlab.gnome.org/GNOME/glib/-/issues/3477#note_2235484)
* [Steam](https://gitlab.gnome.org/GNOME/glib/-/issues/3477#note_2238744)
Notes on specific features
---
Note that we currently depend on a number of features specified in POSIX, but