Not sure why alloca is not available for you,  anyway I'll make a fix to aviod alloca and make it available with the OSE soon
I reported the same issue. I had to modifiy alloca() to ExAllocatePool(), pls see attached diff, wonder if can check in the fix to SVN.
 


--- On Sat, 7/11/09, S. Brandt <[email protected]> wrote:

From: S. Brandt <[email protected]>
Subject: Re: [vbox-dev] Unable to compile OSE 3.0.2 win32: VBoxNetFlt, __alloca_probe_16
To: [email protected]
Date: Saturday, July 11, 2009, 5:52 AM

S. Brandt wrote:
> Hi!
> I'm unable to compile the current 3.0.2 version on Win32, VS05:
>
> kBuild: Linking VBoxNetFlt
>    Creating library E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.lib and object E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.exp
> kBuild: Installing VBoxVideo => E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/bin/additions/VBoxVideo.sys
> VBoxNetFlt-win.obj : error LNK2019: unresolved external symbol __alloca_probe_16 referenced in function _vboxnetfltwinptinitb...@12
> E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.sys : fatal error LNK1120: 1 unresolved externals
   Creating library E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.lib and object E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.exp
VBoxNetFlt-win.obj : error LNK2019: unresolved external symbol __alloca_probe_16 referenced in function _vboxnetfltwinptinitb...@12
E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.sys : fatal error LNK1120: 1 unresolved externals
kmk.exe[2]: *** [E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.sys] Error 1120
The failing command:
@ C:/PROGRA~1/MICROS~3/VC/bin/link.exe -nologo -machine:x86
      -Driver -Subsystem:NATIVE -Incremental:NO -Align:64 -MapInfo:Exports -NoD-Debug    -Entry:driveren...@8  /OUT:E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.sys /MAPINFO:EXPORTS /INCREMENTAL:NO /MAP:E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBoxNetFlt/VBoxNetFlt.map    /LIBPATH:P:/WINDDK/3790.1830/lib/wnet/i386 E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\obj\\VBoxNetFlt\\VBoxNetFlt.obj E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\obj\\VBoxNetFlt\\win\\VBoxNetFlt-win.obj E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\obj\\VBoxNetFlt\\win\\VBoxNetFltPt-win.obj E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\obj\\VBoxNetFlt\\win\\VBoxNetFlt-win.res E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\obj\\VBoxNetFlt\\win\\VBoxNetFltMp-win.obj    P:\\WINDDK\\3790.1830\\lib\\wnet\\i386\\ntoskrnl.lib P:\\WINDDK\\3790.1830\\lib\\wnet\\i386\\hal.lib P:\\WINDDK
\\3790.1830\\lib\\wnet\\i386\\ndis.lib E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\lib\\RuntimeR0Drv.lib  E:\\VirtualBox\\VirtualBox-3.0.2_OSE\\out\\win.x86\\release\\lib\\SUPR0IdcClient.lib

kmk.exe[2]: *** [E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win.x86/release/obj/VBox
NetFlt/VBoxNetFlt.sys] Deleting file `E:/VirtualBox/VirtualBox-3.0.2_OSE/out/win
.x86/release/obj/VBoxNetFlt/VBoxNetFlt.map'


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