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* Re: [Qemu-devel] [PATCH v2 2/4] qga: Fix an enum conversion warningin commands-win32.c, hit by clang.
@ 2019-05-02 21:18 driver1998
  2019-05-02 21:18 ` driver1998
  2019-05-02 21:52 ` Eric Blake
  0 siblings, 2 replies; 6+ messages in thread
From: driver1998 @ 2019-05-02 21:18 UTC (permalink / raw)
  To: qemu-devel, Eric Blake

On 5/1/19 2:25 AM, Eric Blake wrote:
> This adds lots of explicit casts. Are they actually necessary? Without
> seeing the actual warning, it seems fishy to have to be this explicit.

So here are the warnings, on clang version 9.0.0 (trunk 351977).

qga/commands-win32.c:461:24: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeUnknown] = GUEST_DISK_BUS_TYPE_UNKNOWN,
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:462:21: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeScsi] = GUEST_DISK_BUS_TYPE_SCSI,
                    ^~~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:463:22: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeAtapi] = GUEST_DISK_BUS_TYPE_IDE,
                     ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:464:20: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeAta] = GUEST_DISK_BUS_TYPE_IDE,
                   ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:465:21: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusType1394] = GUEST_DISK_BUS_TYPE_IEEE1394,
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:466:20: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeSsa] = GUEST_DISK_BUS_TYPE_SSA,
                   ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:467:22: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeFibre] = GUEST_DISK_BUS_TYPE_SSA,
                     ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:468:20: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeUsb] = GUEST_DISK_BUS_TYPE_USB,
                   ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:469:21: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeRAID] = GUEST_DISK_BUS_TYPE_RAID,
                    ^~~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:470:22: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeiScsi] = GUEST_DISK_BUS_TYPE_ISCSI,
  CC      qga/qapi-generated/qga-qapi-visit.o
                     ^~~~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:471:20: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeSas] = GUEST_DISK_BUS_TYPE_SAS,
                   ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:472:21: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeSata] = GUEST_DISK_BUS_TYPE_SATA,
                    ^~~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:473:20: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeSd] =  GUEST_DISK_BUS_TYPE_SD,
                   ^~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:474:20: error: implicit conversion from enumeration type 'enum GuestDiskBusType' to different
      enumeration type 'STORAGE_BUS_TYPE' (aka 'enum _STORAGE_BUS_TYPE') [-Werror,-Wenum-conversion]
    [BusTypeMmc] = GUEST_DISK_BUS_TYPE_MMC,
                   ^~~~~~~~~~~~~~~~~~~~~~~
qga/commands-win32.c:486:12: error: implicit conversion from enumeration type 'STORAGE_BUS_TYPE'
      (aka 'enum _STORAGE_BUS_TYPE') to different enumeration type 'GuestDiskBusType' (aka 'enum GuestDiskBusType')
      [-Werror,-Wenum-conversion]
    return win2qemu[(int)bus];
    ~~~~~~ ^~~~~~~~~~~~~~~~~~

> Or is it complaining that GuestDiskBusType and STORAGE_BUS_TYPE are
> distinct types, and that we are indeed cross-assigning between the two
> enums because we intentionally want them to share values?

It looks like it is, according to the last warning.

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2019-05-02 22:25 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-05-02 21:18 [Qemu-devel] [PATCH v2 2/4] qga: Fix an enum conversion warningin commands-win32.c, hit by clang driver1998
2019-05-02 21:18 ` driver1998
2019-05-02 21:52 ` Eric Blake
2019-05-02 21:52   ` Eric Blake
2019-05-02 22:24   ` [Qemu-devel] [PATCH v2 2/4] qga: Fix an enum conversion warningincommands-win32.c, " GH Cao
2019-05-02 22:24     ` GH Cao

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