nla_policy results in "sorry, unimplemented: non-trivial designated initializers not supported" during compile

[Avery Rozar]

Thank you, very helpful!

On Thu, Jul 21, 2016 at 8:50 PM, Bushman, Jeff <JBushman at ciena.com> wrote:
> C++ does not support this style of structure initialization, only C.
> The C++ idiom is a constructor or initializer-list
>
> -----Original Message-----
> From: libnl [mailto:libnl-bounces at lists.infradead.org] On Behalf Of Avery Rozar
> Sent: Thursday, July 21, 2016 4:30 PM
> To: David Ahern
> Cc: libnl at lists.infradead.org
> Subject: Re: nla_policy results in "sorry, unimplemented: non-trivial designated initializers not supported" during compile
>
> That's the one.. I suspected I may have to implement differently. I did run What I needed without the policy, just used NULL instead I just want to try and understand what I'm doing better.
>
> On Thu, Jul 21, 2016 at 7:25 PM, David Ahern <dsa at cumulusnetworks.com> wrote:
>> On 7/21/16 5:02 PM, Avery Rozar wrote:
>>>
>>> For example in info.c from "iw" they build an nla_policy
>>> freq_policy[] like this..
>>>
>>> static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
>>>    [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
>>>    [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
>>>    [NL80211_FREQUENCY_ATTR_NO_IR] = { .type = NLA_FLAG },
>>>    [__NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
>>>    [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
>>>    [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 }, };
>>>
>>> Is the ".type" in "{ .type = NLA_U32 }" defined by "uint16_t type"?
>>> Also the compile error points to the end of this freq_policy array.
>>> Is it because I'm using a c file as an example and this would need to
>>> be coded differently in c++?
>>
>>
>> you mean this error:
>> $ g++ -I/usr/include/libnl3/ -c nl-ex.c
>> nl-ex.c: In function ‘int main()’:
>> nl-ex.c:14:2: sorry, unimplemented: non-trivial designated
>> initializers not supported
>>   };
>>   ^
>> nl-ex.c:14:2: sorry, unimplemented: non-trivial designated
>> initializers not supported
>> nl-ex.c:14:2: sorry, unimplemented: non-trivial designated
>> initializers not supported
>> nl-ex.c:14:2: sorry, unimplemented: non-trivial designated
>> initializers not supported
>> nl-ex.c:14:2: sorry, unimplemented: non-trivial designated
>> initializers not supported
>>
>> gcc is fine with it; g++ not.
>>
>> Perhaps the C++ version needs to be implemented differently:
>>
>> http://stackoverflow.com/questions/31215971/non-trivial-designated-ini
>> tializers-not-supported
>
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