qga/vss-win32: fix clang warning with C++20

C++20 deprecated such constructs.

../qga/vss-win32/requester.cpp:380:32: error: bitwise operation between different enumeration types ('_VSS_SNAPSHOT_CONTEXT' and '_VSS_VOLUME_SNAPSHOT_ATTRIBUTES') is deprecated [-Werror,-Wdeprecated-enum-enum-conversion]
  380 |     ctx = VSS_CTX_APP_ROLLBACK | VSS_VOLSNAP_ATTR_TRANSPORTABLE |

This is a false positive, since VSS_CTX_APP_ROLLBACK is not a value
defined in _VSS_VOLUME_SNAPSHOT_ATTRIBUTES enum.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260124182921.531562-10-pierrick.bouvier@linaro.org
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

diff --git a/qga/vss-win32/requester.cpp b/qga/vss-win32/requester.cpp
index 5615955b6f3e8e54400cbbeda860fed3de65fbeb..74489fcd0ae69208c0dd041b6e5c1b1d2858ff02 100644 (file)
--- a/qga/vss-win32/requester.cpp
+++ b/qga/vss-win32/requester.cpp
@@ -377,8 +377,10 @@ void requester_freeze(int *num_vols, void *mountpoints, ErrorSet *errset)
      * To prevent the final commit (which requires to write to snapshots),
      * ATTR_NO_AUTORECOVERY and ATTR_TRANSPORTABLE are specified here.
      */
-    ctx = VSS_CTX_APP_ROLLBACK | VSS_VOLSNAP_ATTR_TRANSPORTABLE |
-        VSS_VOLSNAP_ATTR_NO_AUTORECOVERY | VSS_VOLSNAP_ATTR_TXF_RECOVERY;
+    ctx = VSS_CTX_APP_ROLLBACK;
+    ctx |= VSS_VOLSNAP_ATTR_TRANSPORTABLE |
+           VSS_VOLSNAP_ATTR_NO_AUTORECOVERY |
+           VSS_VOLSNAP_ATTR_TXF_RECOVERY;
     hr = vss_ctx.pVssbc->SetContext(ctx);
     if (hr == (HRESULT)VSS_E_UNSUPPORTED_CONTEXT) {
         /* Non-server version of Windows doesn't support ATTR_TRANSPORTABLE */