[PATCH 2/2] configure: Add -Wno-gnu-variable-sized-type-not-at-end

[Chenyi Qiang <chenyi.qiang@intel.com>]

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.

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
 configure | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure b/configure
index 575dde1c1f..7e0a1a4187 100755
--- a/configure
+++ b/configure
@@ -1258,6 +1258,7 @@ add_to nowarn_flags -Wno-string-plus-int
 add_to nowarn_flags -Wno-typedef-redefinition
 add_to nowarn_flags -Wno-tautological-type-limit-compare
 add_to nowarn_flags -Wno-psabi
+add_to nowarn_flags -Wno-gnu-variable-sized-type-not-at-end
 
 gcc_flags="$warn_flags $nowarn_flags"
 
-- 
2.17.1