vboxdrv build issues (clang)

[CdeMills]

Hello Under CentOS-8, I compile kernel-ml kernels as LC_ALL=C TMPDIR=/var/tmp MAKEFLAGS="LLVM=1 LLVM_IAS=1" nice -n 20 rpmbuild ...

This permits to use clang as the compiler. Version is clang version 14.0.0 (Red Hat 14.0.0-1.module_el8.7.0+1142+5343df54) Target: x86_64-redhat-linux-gnu

Those kernels build and run fine. Yet the vboxdrv build fails. The command line is: env LC_ALL=C TMP=/var/tmp MAKEFLAGS="LLVM=1 LLVM_IAS=1" CC=clang CXX=clang++ LD=ld.lld rcvboxdrv setup

The failure is: /tmp/vbox.0/SUPDrvGip.c:4341:13: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]

case kTscDeltaThreadState_Listening:

/tmp/vbox.0/SUPDrvGip.c:4341:13: note: insert 'attribute((fallthrough));' to silence this warning

case kTscDeltaThreadState_Listening: ^{attribute((fallthrough));}

Could you please try to build it in a similar framework and check the error reproducibility ?

Regards

Pascal

[galitsyn]

Hi Pascal,

There is a fix in this area which you can find in the "Latest 6.1.x test builds" on https://www.virtualbox.org/wiki/Testbuilds. Both rcvboxdrv and rcvboxadd now should detect if kernel was built using clang and act accordingly. There is no need to customly specify environment variables for this anymore. Fix is available starting from r152011 and later.

[galitsyn]

Thank you for reporting the issue. It should be fixed in VirtualBox 6.1.36. Please refer to https://www.virtualbox.org/wiki/Downloads page.