id summary reporter owner description type status component version resolution keywords cc guest host 20998 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" defect closed other VirtualBox 6.1.32 fixed clang other Linux