[petsc-users] error when trying to compile with HPDDM

[Pierre Jolivet]

> On 5 Jan 2023, at 7:06 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> On Thu, Jan 5, 2023 at 11:36 AM Alfredo Jaramillo <ajaramillopalma at gmail.com <mailto:ajaramillopalma at gmail.com>> wrote:
>> Dear developers,
>> I'm trying to compile petsc together with the HPDDM library. A series on errors appeared:
>> 
>> /home/ajaramillo/petsc/x64-openmpi-aldaas2021/include/HPDDM_specifications.hpp: In static member function ‘static constexpr __float128 std::numeric_limits<__float128>::min()’:
>> /home/ajaramillo/petsc/x64-openmpi-aldaas2021/include/HPDDM_specifications.hpp:54:57: error: unable to find numeric literal operator ‘operator""Q’
>>    54 |     static constexpr __float128 min() noexcept { return FLT128_MIN; }
>> 
>> I'm attaching the log files to this email.
> 
> Pierre,
> 
> It looks like we may need to test for FLT_MIN and FLT_MAX in configure since it looks like Alfredo's headers do not have them.
> Is this correct?

We could do that, but I bet this is a side effect of the fact that Alfredo is using --with-cxx-dialect=C++11.
Alfredo, did you got that flag from someone else’s configure, or do you know what that flag is doing?
- If yes, do you really need to stick to -std=c++11?
- If no, please look at https://gitlab.com/petsc/petsc/-/issues/1284#note_1173803107 and consider removing that flag, or at least changing the option to --with-cxx-dialect=11. If compilation still fails, please send the up-to-date configure.log/make.log

Thanks,
Pierre

>   Thanks,
> 
>      Matt
>  
>> Could you please help me with this?
>> 
>> bests regards
>> Alfredo
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener
> 
> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>

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