From: "Peter A. Bigot" <pab@pabigot.com>
To: Marcel Holtmann <marcel@holtmann.org>
Cc: linux-bluetooth@vger.kernel.org
Subject: Re: [BlueZ PATCH] lib: fix variable-length array declarations in hci structures
Date: Tue, 31 Aug 2021 14:30:12 -0700 [thread overview]
Message-ID: <c3b21654-8d46-4b12-7d9b-b3eeb12678f9@pabigot.com> (raw)
In-Reply-To: <3CBFA8E8-ABA1-495F-BFD4-A4E3CBC1E21B@holtmann.org>
On 8/31/21 2:23 PM, Marcel Holtmann wrote:
> Hi Peter,
>
>> Use of zero as the size for arrays as the last element of a structure
>> is a GNU C extension, which as of GCC 10 produces diagnostics when
>> values in the extended array are referenced. Switch to the C99
>> standard idiom for flexible array members, already in use in a few
>> other headers.
>>
>> Signed-off-by: Peter A. Bigot <pab@pabigot.com>
>> ---
>>
>> No changes from previous submission except the BlueZ subject prefix
>> that I hope will get this into bluez.
>>
>> lib/hci.h | 16 ++++++++--------
>> 1 file changed, 8 insertions(+), 8 deletions(-)
>>
>> diff --git a/lib/hci.h b/lib/hci.h
>> index 3382b87bf..a61568bce 100644
>> --- a/lib/hci.h
>> +++ b/lib/hci.h
>> @@ -729,7 +729,7 @@ typedef struct {
>> typedef struct {
>> uint8_t flt_type;
>> uint8_t cond_type;
>> - uint8_t condition[0];
>> + uint8_t condition[];
>> } __attribute__ ((packed)) set_event_flt_cp;
>> #define SET_EVENT_FLT_CP_SIZE 2
> does this break any API assumptions? Since as long as libbluetooth exists these headers are API.
The size of the structure remains the same; there should be no API
changes. I've done this sort of change multiple times over the years
and nobody's reported any problems.
Peter
next prev parent reply other threads:[~2021-08-31 21:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 16:35 [BlueZ PATCH] lib: fix variable-length array declarations in hci structures Peter A. Bigot
2021-08-31 16:51 ` [BlueZ] " bluez.test.bot
2021-08-31 21:23 ` [BlueZ PATCH] " Marcel Holtmann
2021-08-31 21:30 ` Peter A. Bigot [this message]
2021-09-08 17:18 ` Luiz Augusto von Dentz
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