Re: unresolved symbols

Subject: Re: unresolved symbols

From: Terry Lambert <email@hidden>

Date: Sat, 12 Jul 2008 18:47:26 -0700

Delivered-to: email@hidden

#include <sys/cdefs.h>

__BEGIN_DECLS

#include ... // C header files to be used from C++ code

__END_DECLS

Your problem is that you are using external references intended for use in C code in C++ code.

You can file a bug about this, but I believe that the netfulter APIs were never intended for use from C++. You will also need to ensure any callbacks you register are declared as "C functions exported by a C++ object file".

Typically, people attempting to mix BSD and IOKit models write their BSD code in C and their IOKit code in C++, put them in different compilation units, and link them together to get their KEXT.

-- Terry

On Jul 12, 2008, at 5:00 PM, Doug John <email@hidden> wrote:

Hi,

I'm getting a bunch of unresolved symbols when I try to load my kext:

kextload: notice: extension build/Debug/mykext.kext has debug properties set
kextload: extension build/Debug/mykext.kext appears to be loadable

kld(): Undefined symbols:
__Z11iflt_attachP7__ifnetPK10iff_filterPP14__ifnet_filter
__Z11iflt_detachP14__ifnet_filter
__Z13mbuf_tag_findP6__mbufjtPmPPv
__Z16mbuf_tag_id_findPKcPj

__Z17mbuf_tag_allocateP6__mbufjtmjPPv
__Z8mbuf_lenP6__mbuf
__Z9mbuf_dataP6__mbuf
__Z9mbuf_nextP6__mbuf

Translated as:

iflt_attach(__ifnet*, iff_filter const*, __ifnet_filter**)

iflt_detach(__ifnet_filter*)
mbuf_tag_find(__mbuf*, unsigned int, unsigned short, unsigned long*, void**)
mbuf_tag_id_find(char const*, unsigned int*)
mbuf_tag_allocate(__mbuf*, unsigned int, unsigned short, unsigned long, unsigned int, void**)

mbuf_len(__mbuf*)
mbuf_data(__mbuf*)
mbuf_next(__mbuf*)

My OSBundleLibraries are as follows:

<key>OSBundleLibraries</key>

<dict>
<key>com.apple.kpi.bsd</key>
<string>8.0</string>

<key>com.apple.kpi.iokit</key>
<string>8.0</string>
<key>com.apple.kpi.libkern</key>
<string>8.0</string>
<key>com.apple.kpi.mach</key>
<string>8.0</string>
</dict>

Which I thought would be correct given the instructions here:
http://developer.apple.com/documentation/Darwin/Conceptual/NKEConceptual/about/chapter_2_section_1.html

I'm building against the 10.4 SDK on 10.5.4.
Any idea what is going on?

Thanks,
Doug

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References:

>unresolved symbols (From: "Doug John" <email@hidden>)