Build error (5.0.4) on Linux 32-bit system => Fixed in SVN

[Larry998]

As the VirtualBox maintainer for openSUSE, I need to build both 32- and 64-bit versions. For a 64-bit system, all is fine. On a 32-bit platform with gcc 5.1.1, I get the following errors:

[  528s] /home/abuild/rpmbuild/BUILD/VirtualBox-5.0.4/src/VBox/ExtPacks/VNC/VBoxVNC.cpp: In static member function 'static int VNCServerImpl::VRDEEnableConnections(HVRDESERVER, bool)':
[  528s] /home/abuild/rpmbuild/BUILD/VirtualBox-5.0.4/src/VBox/ExtPacks/VNC/VBoxVNC.cpp:339:30: error: invalid conversion from 'rfbNewClientAction (__attribute__((regparm(0), cdecl)) *)(rfbClientPtr) {aka rfbNewClientAction (__attribute__((regparm(0), cdecl)) *)(_rfbClientRec*)}' to 'rfbNewClientHookPtr {aka rfbNewClientAction (*)(_rfbClientRec*)}' [-fpermissive]
[  528s]      vncServer->newClientHook = rfbNewClientEvent;
[  528s]                               ^
[  528s] /home/abuild/rpmbuild/BUILD/VirtualBox-5.0.4/src/VBox/ExtPacks/VNC/VBoxVNC.cpp:341:28: error: invalid conversion from 'void (__attribute__((regparm(0), cdecl)) *)(int, int, int, rfbClientPtr) {aka void (__attribute__((regparm(0), cdecl)) *)(int, int, int, _rfbClientRec*)}' to 'rfbPtrAddEventProcPtr {aka void (*)(int, int, int, _rfbClientRec*)}' [-fpermissive]
[  528s]      vncServer->ptrAddEvent = vncMouseEvent;
[  528s]                             ^
[  528s] kmk: *** [/home/abuild/rpmbuild/BUILD/VirtualBox-5.0.4/out/linux.x86/release/obj/VBoxVNC/VBoxVNC.o] Error 1

My C++ skills are not good, and I have no idea how to fix this.

[Jan Palus]

We face the same issue here at PLD. The issue was tracked down to this commit:

r57336 | vboxsync | 2015-08-14 00:17:35 +0200 (pią, 14 sie 2015) | 1 line

iprt/cdefs.h,PGMDbg.cpp: Align DECLASM and DECLCALLBACK (and the rest) so we won't get into trouble with newer gcc versions finally checking for compatible calling conventions.

Reverting above commit fixes 32bit build but build for x32 ABI is still broken with multiple errors:

/tmp/B.b6eec353-b4f1-4cad-8990-af0914885009/BUILD/VirtualBox-5.0.4/include/iprt/types.h:726:37: error: 'cdecl' attribute ignored [-Werror=attributes] 

[Frank Mehnert]

Already fixed in r57658.

[Jan Palus]

After applying fix from SVN there is new error:

/tmp/B.77ef36aa-4579-4e40-b692-860116fb03e4/BUILD/VirtualBox-5.0.4/src/VBox/Additions/linux/lightdm-greeter/vbox-greeter.cpp:929:64: error: invalid conversion from 'void (*)(PRTLOGGER, RTLOGPHASE, PFNRTLOGPHASEMSG) {aka void (*)(RTLOGGER*, RTLOGPHASE, void (__attribute__((regparm(0), cdecl)) *)(RTLOGGER*, const char*, ...))}' to 'PFNRTLOGPHASE {aka void (__attribute__((regparm(0), cdecl)) *)(RTLOGGER*, RTLOGPHASE, void (__attribute__((regparm(0), cdecl)) *)(RTLOGGER*, const char*, ...))}' [-fpermissive]

[Frank Mehnert]

Thanks. That one should be fixed in r57690.

[Larry998]

Thanks for the quick response. The updated 5.0.4 has not been submitte4d to the openSUSE Factory build system to produce a new package.

[Frank Mehnert]

Fix is part of VBox 5.0.6.