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include: add comment on _XSERVER64 define

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Since the whole 32/64 bit issue is a bit complex, it's worth adding some
comment on what the _XSERVER64 symbol really is needed for.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1413>
(cherry picked from commit afaad1b847)
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Enrico Weigelt, metux IT consult 2024-03-18 12:34:49 +01:00 • committed by Alan Coopersmith
parent 66dc69fe25
commit 8e2eed4d78
1 changed files with 4 additions and 0 deletions
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include/meson.build
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@ -44,6 +44,10 @@ else
conf_data.set('X_BYTE_ORDER', 'X_BIG_ENDIAN')
endif
# Defining _XSERVER64 on 64bit builds is VITAL, since otherwise Xlib headers
# would define lots X types (eg. Atom, XID, etc) as 64 bit, but inside the
# Xserver we really need them to be 32 bit (CARD32). When _SERVER64 is defined
# the xlib headers will typedef them exactly to CARD32.
glx_align64 = []
if cc.sizeof('unsigned long') == 8
conf_data.set('_XSERVER64', '1')