[petsc-users] C++11 related issue

[Matthew Knepley]

On Thu, Aug 24, 2023 at 6:10 AM maitri ksh <maitri.ksh at gmail.com> wrote:

> I was facing a problem while compiling a code (which earlier, got compiled
> successfully using the same petsc set up), the problem was related to
> compilers. I decided to reconfigure petsc but ran into errors which are
> related to non-compliance of the compiler with  'C++11'. I had faced this
> issue earlier when I was installing Petsc and I had it resolved by using a
> newer version of compiler (openmpi-4.1.5).
>

OpenMPI is not a compiler. It is an implementation of MPI that produces
compiler wrappers. Your actual compiler appears to be GCC 4.8.2:

              Output from compiling with  -std=c++11
In file included from /usr/include/c++/4.8.2/algorithm:62:0,
                 from /tmp/petsc-hl_0r720/config.setCompilers/conftest.cc:9:
/usr/include/c++/4.8.2/bits/stl_algo.h: In instantiation of
‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator,
_RandomAccessIterator, const _Tp&, _Compare) [with _RandomAccessIterator =
__gnu_cxx::__normal_iterator<std::unique_ptr<double>*,
std::vector<std::unique_ptr<double> > >; _Tp = std::unique_ptr<double>;
_Compare = main()::__lambda0]’:
/usr/include/c++/4.8.2/bits/stl_algo.h:2296:78:   required from
‘_RandomAccessIterator
std::__unguarded_partition_pivot(_RandomAccessIterator,
_RandomAccessIterator, _Compare) [with _RandomAccessIterator =
__gnu_cxx::__normal_iterator<std::unique_ptr<double>*,
std::vector<std::unique_ptr<double> > >; _Compare = main()::__lambda0]’
/usr/include/c++/4.8.2/bits/stl_algo.h:2337:62:   required from ‘void
std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size,
_Compare) [with _RandomAccessIterator =
__gnu_cxx::__normal_iterator<std::unique_ptr<double>*,
std::vector<std::unique_ptr<double> > >; _Size = long int; _Compare =
main()::__lambda0]’
/usr/include/c++/4.8.2/bits/stl_algo.h:5499:44:   required from ‘void
std::sort(_RAIter, _RAIter, _Compare) [with _RAIter =
__gnu_cxx::__normal_iterator<std::unique_ptr<double>*,
std::vector<std::unique_ptr<double> > >; _Compare = main()::__lambda0]’
/tmp/petsc-hl_0r720/config.setCompilers/conftest.cc:58:119:   required from
here
/usr/include/c++/4.8.2/bits/stl_algo.h:2263:35: error: no match for call to
‘(main()::__lambda0) (std::unique_ptr<double>&, const
std::unique_ptr<double>&)’
    while (__comp(*__first, __pivot))
                                   ^
/tmp/petsc-hl_0r720/config.setCompilers/conftest.cc:58:42: note: candidates
are:
 std::sort(vector.begin(), vector.end(), [](std::unique_ptr<double> &a,
std::unique_ptr<double> &b) { return *a < *b; });
                                          ^
In file included from /usr/include/c++/4.8.2/algorithm:62:0,
                 from /tmp/petsc-hl_0r720/config.setCompilers/conftest.cc:9:
/usr/include/c++/4.8.2/bits/stl_algo.h:2263:35: note: bool
(*)(std::unique_ptr<double>&, std::unique_ptr<double>&) <conversion>
    while (__comp(*__first, __pivot))

This compiler was released almost 10 years ago and has incomplete support
for C++11.


> Now, I am trying to use the same compiler (openmpi-4.1.5) to reconfigure
> petsc but the old issue (related to 'C++11') pops up. I used a code that
> was available online
> <https://stackoverflow.com/questions/5047971/how-do-i-check-for-c11-support>
> to check if the present compiler supports C++11, and it shows it does
> support.
>

You may not have read to the bottom of the answer, but it tells you how to
check for complete support for C++11 and this compiler definitely does not
have it.

  Thanks,

     Matt


> I have attached the '*configure.log*' herewith for your reference.
> Can anyone suggest how to resolve/work-around this issue?
>


-- 
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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