[qemu-xen staging] configure: Expand test which disable -Wmissing-braces

[patchbot@xxxxxxx]

commit 625eb5e96dc96aa7fddef59a08edae215527f19c
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Fri Jan 6 15:21:10 2023 +0100
Commit:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
CommitDate: Tue Jan 17 15:10:57 2023 +0000

    configure: Expand test which disable -Wmissing-braces
    
    With "clang 6.0.0-1ubuntu2" on Ubuntu Bionic, the test with build
    fine, but clang still suggest braces around the zero initializer in a
    few places, where there is a subobject. Expand test to include a sub
    struct which doesn't build on clang 6.0.0-1ubuntu2, and give:
        config-temp/qemu-conf.c:7:8: error: suggest braces around 
initialization of subobject [-Werror,-Wmissing-braces]
        } x = {0};
               ^
               {}
    
    These are the error reported by clang on QEMU's code (v7.2.0):
    hw/pci-bridge/cxl_downstream.c:101:51: error: suggest braces around 
initialization of subobject [-Werror,-Wmissing-braces]
        dvsec = (uint8_t *)&(CXLDVSECPortExtensions){ 0 };
    
    hw/pci-bridge/cxl_root_port.c:62:51: error: suggest braces around 
initialization of subobject [-Werror,-Wmissing-braces]
        dvsec = (uint8_t *)&(CXLDVSECPortExtensions){ 0 };
    
    tests/qtest/virtio-net-test.c:322:34: error: suggest braces around 
initialization of subobject [-Werror,-Wmissing-braces]
        QOSGraphTestOptions opts = { 0 };
    
    Reported-by: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Message-Id: <20230106142110.672-1-anthony.perard@xxxxxxxxxx>
---
 configure | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure b/configure
index 26c7bc5154..08eac0d42c 100755
--- a/configure
+++ b/configure
@@ -1288,7 +1288,11 @@ fi
 # Disable -Wmissing-braces on older compilers that warn even for
 # the "universal" C zero initializer {0}.
 cat > $TMPC << EOF
+struct s {
+  void *a;
+};
 struct {
+  struct s s;
   int a[2];
 } x = {0};
 EOF
--
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