netdev - Re: [PATCH iproute2] iproute: make clang happy

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Message-ID: <CAF2d9jj5EpLjGgpe94vYj9jt-MJHyZEcNaLOUTtYtibgEBpzww@mail.gmail.com>
Date:   Mon, 20 Aug 2018 16:38:17 -0700
From:   Mahesh Bandewar (महेश बंडेवार) 
        <maheshb@...gle.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Mahesh Bandewar <mahesh@...dewar.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2] iproute: make clang happy

On Mon, Aug 20, 2018 at 3:52 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> On Mon, 20 Aug 2018 14:42:15 -0700
> Mahesh Bandewar <mahesh@...dewar.net> wrote:
>
>> diff --git a/tc/m_ematch.c b/tc/m_ematch.c
>> index ace4b3dd738b..a524b520b276 100644
>> --- a/tc/m_ematch.c
>> +++ b/tc/m_ematch.c
>> @@ -277,6 +277,7 @@ static int flatten_tree(struct ematch *head, struct ematch *tree)
>>       return count;
>>  }
>>
>> +__attribute__((format(printf, 5, 6)))
>>  int em_parse_error(int err, struct bstr *args, struct bstr *carg,
>>                  struct ematch_util *e, char *fmt, ...)
>
> I think the printf attribute needs to go on the function prototype
> here:
> tc/m_ematch.h:extern int em_parse_error(int err, struct bstr *args, struct bstr *carg,
>
The attributes are attached to the definitions only and not prototype
declarations. Please see the definition/declaration for jsonw_printf()
in the same patch.
>
> PS: I need to take the extern of  those function prototypes.