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docs/devel: Rules on #include in headers

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Rules for headers were proposed a long time ago, and generally liked:

    Message-ID: <87h9g8j57d.fsf@blackfin.pond.sub.org>
    https://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg03345.html

Wortk them into docs/devel/style.rst.

Suggested-by: Bernhard Beschow <shentey@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20221222120813.727830-5-armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Bernhard Beschow <shentey@gmail.com>
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Markus Armbruster 2022-12-22 13:08:13 +01:00 committed by Michael S. Tsirkin
parent 7a5951f651
commit f07ceffdf5
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docs/devel/style.rst
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@ -293,6 +293,13 @@ that QEMU depends on.
Do not include "qemu/osdep.h" from header files since the .c file will have
already included it.
Headers should normally include everything they need beyond osdep.h.
If exceptions are needed for some reason, they must be documented in
the header. If all that's needed from a header is typedefs, consider
putting those into qemu/typedefs.h instead of including the header.
Cyclic inclusion is forbidden.
C types
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