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Date: Mon, 12 Feb 2024 15:42:20 +0000
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Subject: Re: [PATCH 1/1] eal: add C++ include guard in generic/rte_vect.h
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To: Bruce Richardson <bruce.richardson@intel.com>,
Thomas Monjalon <thomas@monjalon.net>
Cc: Ashish Sadanandan <ashish.sadanandan@gmail.com>, dev@dpdk.org,
nelio.laranjeiro@6wind.com, stable@dpdk.org, honnappa.nagarahalli@arm.com,
konstantin.v.ananyev@yandex.ru, david.marchand@redhat.com,
ruifeng.wang@arm.com
References: <20240202051335.776290-1-ashish.sadanandan@gmail.com>
<5751086.DvuYhMxLoT@thomas>
<Zby4qwyuHE_SAiFI@bricha3-MOBL.ger.corp.intel.com>
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Errors-To: dev-bounces@dpdk.org
On 2/2/2024 9:40 AM, Bruce Richardson wrote:
> On Fri, Feb 02, 2024 at 10:18:23AM +0100, Thomas Monjalon wrote:
>> 02/02/2024 06:13, Ashish Sadanandan:
>>> The header was missing the extern "C" directive which causes name
>>> mangling of functions by C++ compilers, leading to linker errors
>>> complaining of undefined references to these functions.
>>>
>>> Fixes: 86c743cf9140 ("eal: define generic vector types")
>>> Cc: nelio.laranjeiro@6wind.com
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Ashish Sadanandan <ashish.sadanandan@gmail.com>
>>
>> Thank you for improving C++ compatibility.
>>
>> I'm not sure what is best to fix it.
>> You are adding extern "C" in a file which is not directly included
>> by the user app. The same was done for rte_rwlock.h.
>> The other way is to make sure this include is in an extern "C" block
>> in lib/eal/*/include/rte_vect.h (instead of being before the block).
>>
>> I would like we use the same approach for all files.
>> Opinions?
>>
> I think just having the extern "C" guard in all files is the safest choice,
> because it's immediately obvious in each and every file that it is correct.
> Taking the other option, to check any indirect include file you need to go
> finding what other files include it and check there that a) they have
> include guards and b) the include for the indirect header is contained
> within it.
>
I assume you mean all header files exposed to user (ones installed by
meson), in that case +1
> Adopting the policy of putting the guard in each and every header is also a
> lot easier to do basic automated sanity checks on. If the file ends in .h,
> we just use grep to quickly verify it's not missing the guards. [Naturally,
> we can do more complete checks than that if we want, but 99% percent of
> misses can be picked up by a grep for the 'extern "C"' bit]
>
> /Bruce