[Bug 228433] emulators/virtualbox-ose-kmod: compile error: error: "offsetof is not defined!"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228433

Guido Falsi <madpilot at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |madpilot at FreeBSD.org,
                   |                            |vbox at FreeBSD.org
 Attachment #193639|                            |maintainer-approval?(vbox at F
              Flags|                            |reeBSD.org)

--- Comment #1 from Guido Falsi <madpilot at FreeBSD.org> ---
Created attachment 193639
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193639&action=edit
Tantive patch

I've hit this myself just now.

Having a look at the failing part of the source code it looks like what they
define as a kludge is not necessary anymore and has been fixed in base r324622.

I also suspect the kludge was already not necessary when they switched from
including stddef.h to including sys/stddef.h, which has never diverged from
types.h in the definition of offsetof.

I've made a very simple patch removing the kludge and simply including the
required files. It does compile, but I still have to test it at runtime, which
I will do once building a bunch of other packages is done and report back.

I'm anyway attaching my patch for reference.

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