Re: error on inclusion of ../boost/math/special_functions/next.hpp

From: Alexander Grund (alexander.grund_at_[hidden])
Date: 2023-11-03 07:55:57

>>> Test output: teeks99-dkr-dc6-17 - serialization - test_complex_text_archive / clang-linux-6.0~c++17
>>> Rev 1c12b5c15fc82f0cb6d4bd931a057fc050df8a34 / Sun, 29 Oct 2023 21:39:02 +0000
>>> Compile [2023-10-29 23:34:25 UTC]: fail
>>>
>>>
>>>     "clang++-6.0"   -fvisibility-inlines-hidden -Wno-c99-extensions -std=c++17 -fPIC -m64 -pthread -O0 -fno-inline -Wall -fvisibility=hidden --target=x86_64-pc-linux -ftemplate-depth-255 -DBOOST_ALL_NO_LIB=1 -DBOOST_ARCHIVE_TEST=text_archive.hpp -DBOOST_ATOMIC_DYN_LINK=1 -DBOOST_BEAST_ALLOW_DEPRECATED -DBOOST_BEAST_SEPARATE_COMPILATION -DBOOST_COBALT_USE_STD_PMR=1 -DBOOST_FILESYSTEM_DYN_LINK=1 -DBOOST_LIB_DIAGNOSTIC=1 -DBOOST_SERIALIZATION_DYN_LINK=1 -DBOOST_WSERIALIZATION_DYN_LINK=1   -I".."  -c -o "/var/boost/run/results/boost/bin.v2/libs/serialization/test/test_complex_text_archive.test/clang-linux-6.0~c++17/debug/debug-symbols-off/threading-multi/visibility-hidden/test_complex.o" "../libs/serialization/test/test_complex.cpp"
>>>
>>> In file included from ../libs/serialization/test/test_complex.cpp:19:
>>> In file included from ../boost/math/special_functions/next.hpp:17:
>>> In file included from ../boost/math/special_functions/trunc.hpp:21:
>>> In file included from ../boost/math/ccmath/ldexp.hpp:15:
>>> In file included from ../boost/math/ccmath/abs.hpp:16:
>>> ../boost/math/ccmath/isnan.hpp:35:29: error: no template named 'is_integral_v' in namespace 'std'; did you mean 'is_integral'?
>>>         if constexpr (!std::is_integral_v<T>)
>>>                        ~~~~~^~~~~~~~~~~~~
>>>                             is_integral
>>> /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/type_traits:289:12: note: 'is_integral' declared here
>>>     struct is_integral
>>>            ^

Looks like using clang-6 with libstdc++ 5. Do we really support such 
configurations (or this in particular)? Although the fix is easy 
(replace the `*_v` inline variables by `::value` variants) it is 
additional effort.

Alex