On Thu, 8 Sept 2022 at 09:08, Chenyi Qiang <chenyi.qi...@intel.com> wrote: > > After updating linux headers to v6.0-rc, clang build on x86 target would > generate warnings like: > > target/i386/kvm/kvm.c:470:25: error: field 'info' with variable sized > type 'struct kvm_msrs' not at the end of a struct or class is a GNU > extension [-Werror,-Wgnu-variable-sized-type-not-at-end] > struct kvm_msrs info; > ^ > target/i386/kvm/kvm.c:1701:27: error: field 'cpuid' with variable sized > type 'struct kvm_cpuid2' not at the end of a struct or class is a GNU > extension [-Werror,-Wgnu-variable-sized-type-not-at-end] > struct kvm_cpuid2 cpuid; > ^ > target/i386/kvm/kvm.c:2868:25: error: field 'info' with variable sized > type 'struct kvm_msrs' not at the end of a struct or class is a GNU > extension [-Werror,-Wgnu-variable-sized-type-not-at-end] > struct kvm_msrs info; > ^ > > Considering that it is OK to use GNU extension in QEMU (e.g. g_auto stuff), > it is acceptable to turn off this warning, which is only relevant to people > striving for fully portable C code.
Can we get the kernel folks to fix their headers not to use GCC extensions like this ? It's not a big deal for us I guess, but in general it doesn't seem great that the kernel headers rely on userspace to silence warnings... -- PMM
