[arch-general] [arch-dev-public] GCC 11 and new toolchain on [testing]

[Lone_Wolf]

On 15-05-2021 12:25, Lone_Wolf via arch-general wrote:
>
> On 14-05-2021 23:06, Genes Lists via arch-general wrote:
>> On 5/13/21 9:29 PM, Giancarlo Razzolini via arch-dev-public wrote:
>>> Hi,
>>>
>> ...
>>>
>>> Also, if you guys notice any issues, let me know.
>>>
>>> Regards,
>>> Giancarlo Razzolini
>>
>>
>> Hi
>>
>> FYI, I've come across one issue which was triggered after updating to 
>> gcc 11.
>>
>> Building kea (from git) worked fine using gcc 10, I am now seeing fail :
>>
>> checking thread support... no
>> configure: WARNING: unsupported C++11 feature
>> configure: retrying by adding --std=c++1x to g++ --std=c++0x
>> checking --std=c++1x support... no
>> configure: error: thread (a C++11 feature) is not supported
>>
>> gene
>
>
> It seems gcc11 in C++11 mode has only partial support for thread 
> safety and the thread class[1] .
>
> Does it work if you build with -std=c++11 or -std=gnu++11 ?
>
> LW
>
>
>
> [1] 
> https://gcc.gnu.org/onlinedocs/gcc-11.1.0/libstdc++/manual/manual/status.html#status.iso.2011


found another possible cause in https://gcc.gnu.org/gcc-11/porting_to.html .

 > The following headers are used less widely in libstdc++ and may need 
to be included explicitly when compiled with GCC 11:

 > <limits> (for std::numeric_limits)
 > <memory> (for std::unique_ptr, std::shared_ptr etc.)
 > <utility> (for std::pair, std::tuple_size, std::index_sequence etc.)
 > <thread> (for members of namespace std::this_thread.)

P.S. sorry for the bad formatting in previous message.

LW