compilation error while using intel c++ compiler 2018

[tomqt]

Hello!

I am facing an issue that maybe has been already solved but I can't find documentation regarding it.
When trying to compile a new project that includes json.hpp with Intel C++ 18.0 compiler (as well for Intel C++ 17.0) in visual studio
I get the following errors:

...\json.hpp(428): error : type name is not allowed
detect(std::declval<typename BasicJsonType::template json_serializer<T, void>()))>::value;

...\json.hpp(446): error : type name is not allowed
std::declval<typename BasicJsonType::template json_serializer<T, void>()))>::value;

...\json.hpp(461): error : type name is not allowed
std::declval<typename BasicJsonType::template json_serializer<T, void>()))>::value;

Is it a known and solved issue?

Thanks!

[nlohmann]

No, unfortunately I have no idea how to solve this.

[nlohmann]

I cannot reproduce this issue. I could compile the test suite without problems. I only needed to set CXXFLAGS=-std=c++11, because CMake seems to not have done this:

root@f431bb6d8315:~/json/build# CXX=/opt/intel/bin/icc CXXFLAGS=-std=c++11 cmake ..
-- The CXX compiler identification is Intel 18.0.1.20171018
-- Check for working CXX compiler: /opt/intel/bin/icc
-- Check for working CXX compiler: /opt/intel/bin/icc -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Using the single-header code from /root/json/single_include/
-- Configuring done
-- Generating done
-- Build files have been written to: /root/json/build
root@f431bb6d8315:~/json/build# make
Scanning dependencies of target catch_main
[  1%] Building CXX object test/CMakeFiles/catch_main.dir/src/unit.cpp.o
[  1%] Built target catch_main
Scanning dependencies of target test-element_access1
[  2%] Building CXX object test/CMakeFiles/test-element_access1.dir/src/unit-element_access1.cpp.o
[  3%] Linking CXX executable test-element_access1
[  3%] Built target test-element_access1
Scanning dependencies of target test-merge_patch
[  5%] Building CXX object test/CMakeFiles/test-merge_patch.dir/src/unit-merge_patch.cpp.o
[  6%] Linking CXX executable test-merge_patch
[  6%] Built target test-merge_patch
Scanning dependencies of target test-msgpack
[  7%] Building CXX object test/CMakeFiles/test-msgpack.dir/src/unit-msgpack.cpp.o
[  9%] Linking CXX executable test-msgpack
[  9%] Built target test-msgpack
Scanning dependencies of target test-element_access2
[ 10%] Building CXX object test/CMakeFiles/test-element_access2.dir/src/unit-element_access2.cpp.o
[ 11%] Linking CXX executable test-element_access2
[ 11%] Built target test-element_access2
Scanning dependencies of target test-class_parser
[ 12%] Building CXX object test/CMakeFiles/test-class_parser.dir/src/unit-class_parser.cpp.o
[ 14%] Linking CXX executable test-class_parser
[ 14%] Built target test-class_parser
Scanning dependencies of target test-algorithms
[ 15%] Building CXX object test/CMakeFiles/test-algorithms.dir/src/unit-algorithms.cpp.o
[ 16%] Linking CXX executable test-algorithms
[ 16%] Built target test-algorithms
Scanning dependencies of target test-udt
[ 18%] Building CXX object test/CMakeFiles/test-udt.dir/src/unit-udt.cpp.o
[ 19%] Linking CXX executable test-udt
[ 19%] Built target test-udt
Scanning dependencies of target test-meta
[ 20%] Building CXX object test/CMakeFiles/test-meta.dir/src/unit-meta.cpp.o
[ 22%] Linking CXX executable test-meta
[ 22%] Built target test-meta
Scanning dependencies of target test-comparison
[ 23%] Building CXX object test/CMakeFiles/test-comparison.dir/src/unit-comparison.cpp.o
[ 24%] Linking CXX executable test-comparison
[ 24%] Built target test-comparison
Scanning dependencies of target test-modifiers
[ 25%] Building CXX object test/CMakeFiles/test-modifiers.dir/src/unit-modifiers.cpp.o
[ 27%] Linking CXX executable test-modifiers
[ 27%] Built target test-modifiers
Scanning dependencies of target test-unicode
[ 28%] Building CXX object test/CMakeFiles/test-unicode.dir/src/unit-unicode.cpp.o
[ 29%] Linking CXX executable test-unicode
[ 29%] Built target test-unicode
Scanning dependencies of target test-reference_access
[ 31%] Building CXX object test/CMakeFiles/test-reference_access.dir/src/unit-reference_access.cpp.o
[ 32%] Linking CXX executable test-reference_access
[ 32%] Built target test-reference_access
Scanning dependencies of target test-class_const_iterator
[ 33%] Building CXX object test/CMakeFiles/test-class_const_iterator.dir/src/unit-class_const_iterator.cpp.o
[ 35%] Linking CXX executable test-class_const_iterator
[ 35%] Built target test-class_const_iterator
Scanning dependencies of target test-convenience
[ 36%] Building CXX object test/CMakeFiles/test-convenience.dir/src/unit-convenience.cpp.o
[ 37%] Linking CXX executable test-convenience
[ 37%] Built target test-convenience
Scanning dependencies of target test-class_iterator
[ 38%] Building CXX object test/CMakeFiles/test-class_iterator.dir/src/unit-class_iterator.cpp.o
[ 40%] Linking CXX executable test-class_iterator
[ 40%] Built target test-class_iterator
Scanning dependencies of target test-to_chars
[ 41%] Building CXX object test/CMakeFiles/test-to_chars.dir/src/unit-to_chars.cpp.o
[ 42%] Linking CXX executable test-to_chars
[ 42%] Built target test-to_chars
Scanning dependencies of target test-inspection
[ 44%] Building CXX object test/CMakeFiles/test-inspection.dir/src/unit-inspection.cpp.o
[ 45%] Linking CXX executable test-inspection
[ 45%] Built target test-inspection
Scanning dependencies of target test-iterators1
[ 46%] Building CXX object test/CMakeFiles/test-iterators1.dir/src/unit-iterators1.cpp.o
[ 48%] Linking CXX executable test-iterators1
[ 48%] Built target test-iterators1
Scanning dependencies of target test-json_patch
[ 49%] Building CXX object test/CMakeFiles/test-json_patch.dir/src/unit-json_patch.cpp.o
[ 50%] Linking CXX executable test-json_patch
[ 50%] Built target test-json_patch
Scanning dependencies of target test-constructor1
[ 51%] Building CXX object test/CMakeFiles/test-constructor1.dir/src/unit-constructor1.cpp.o
[ 53%] Linking CXX executable test-constructor1
[ 53%] Built target test-constructor1
Scanning dependencies of target test-readme
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[ 55%] Built target test-readme
Scanning dependencies of target test-json_pointer
[ 57%] Building CXX object test/CMakeFiles/test-json_pointer.dir/src/unit-json_pointer.cpp.o
[ 58%] Linking CXX executable test-json_pointer
[ 58%] Built target test-json_pointer
Scanning dependencies of target test-serialization
[ 59%] Building CXX object test/CMakeFiles/test-serialization.dir/src/unit-serialization.cpp.o
/root/json/test/src/unit-serialization.cpp(71): warning #1478: function "nlohmann::operator>>(const nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::ostream &)" (declared at line 15515 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              j >> ss;
                ^

/root/json/test/src/unit-serialization.cpp(80): warning #1478: function "nlohmann::operator>>(const nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::ostream &)" (declared at line 15515 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              j >> ss;
                ^

/root/json/test/src/unit-serialization.cpp(91): warning #1478: function "nlohmann::operator>>(const nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::ostream &)" (declared at line 15515 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              j >> ss;
                ^

[ 61%] Linking CXX executable test-serialization
[ 61%] Built target test-serialization
Scanning dependencies of target test-constructor2
[ 62%] Building CXX object test/CMakeFiles/test-constructor2.dir/src/unit-constructor2.cpp.o
[ 63%] Linking CXX executable test-constructor2
[ 63%] Built target test-constructor2
Scanning dependencies of target test-iterators2
[ 64%] Building CXX object test/CMakeFiles/test-iterators2.dir/src/unit-iterators2.cpp.o
[ 66%] Linking CXX executable test-iterators2
[ 66%] Built target test-iterators2
Scanning dependencies of target test-concepts
[ 67%] Building CXX object test/CMakeFiles/test-concepts.dir/src/unit-concepts.cpp.o
[ 68%] Linking CXX executable test-concepts
[ 68%] Built target test-concepts
Scanning dependencies of target test-ubjson
[ 70%] Building CXX object test/CMakeFiles/test-ubjson.dir/src/unit-ubjson.cpp.o
[ 71%] Linking CXX executable test-ubjson
[ 71%] Built target test-ubjson
Scanning dependencies of target test-cbor
[ 72%] Building CXX object test/CMakeFiles/test-cbor.dir/src/unit-cbor.cpp.o
[ 74%] Linking CXX executable test-cbor
[ 74%] Built target test-cbor
Scanning dependencies of target test-capacity
[ 75%] Building CXX object test/CMakeFiles/test-capacity.dir/src/unit-capacity.cpp.o
[ 76%] Linking CXX executable test-capacity
[ 76%] Built target test-capacity
Scanning dependencies of target test-allocator
[ 77%] Building CXX object test/CMakeFiles/test-allocator.dir/src/unit-allocator.cpp.o
[ 79%] Linking CXX executable test-allocator
[ 79%] Built target test-allocator
Scanning dependencies of target test-noexcept
[ 80%] Building CXX object test/CMakeFiles/test-noexcept.dir/src/unit-noexcept.cpp.o
[ 81%] Linking CXX executable test-noexcept
[ 81%] Built target test-noexcept
Scanning dependencies of target test-items
[ 83%] Building CXX object test/CMakeFiles/test-items.dir/src/unit-items.cpp.o
/root/json/test/src/unit-items.cpp(43): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto i : json::iterator_wrapper(j))
                                  ^

/root/json/test/src/unit-items.cpp(76): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto& i : json::iterator_wrapper(j))
                                   ^

/root/json/test/src/unit-items.cpp(120): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto i : json::iterator_wrapper(j))
                                        ^

/root/json/test/src/unit-items.cpp(153): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto& i : json::iterator_wrapper(j))
                                         ^

/root/json/test/src/unit-items.cpp(189): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto i : json::iterator_wrapper(j))
                                  ^

/root/json/test/src/unit-items.cpp(222): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto& i : json::iterator_wrapper(j))
                                   ^

/root/json/test/src/unit-items.cpp(255): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto i : json::iterator_wrapper(j))
                                        ^

/root/json/test/src/unit-items.cpp(288): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto& i : json::iterator_wrapper(j))
                                         ^

/root/json/test/src/unit-items.cpp(324): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto i : json::iterator_wrapper(j))
                                  ^

/root/json/test/src/unit-items.cpp(357): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto& i : json::iterator_wrapper(j))
                                   ^

/root/json/test/src/unit-items.cpp(401): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto i : json::iterator_wrapper(j))
                                        ^

/root/json/test/src/unit-items.cpp(434): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto& i : json::iterator_wrapper(j))
                                         ^

/root/json/test/src/unit-items.cpp(470): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto i : json::iterator_wrapper(j))
                                  ^

/root/json/test/src/unit-items.cpp(503): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto& i : json::iterator_wrapper(j))
                                   ^

/root/json/test/src/unit-items.cpp(536): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto i : json::iterator_wrapper(j))
                                        ^

/root/json/test/src/unit-items.cpp(569): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto& i : json::iterator_wrapper(j))
                                         ^

/root/json/test/src/unit-items.cpp(605): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto i : json::iterator_wrapper(j))
                                  ^

/root/json/test/src/unit-items.cpp(620): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto& i : json::iterator_wrapper(j))
                                   ^

/root/json/test/src/unit-items.cpp(641): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto i : json::iterator_wrapper(j))
                                        ^

/root/json/test/src/unit-items.cpp(656): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13861 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto& i : json::iterator_wrapper(j))
                                         ^

/root/json/test/src/unit-items.cpp(674): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto i : json::iterator_wrapper(j))
                                  ^

/root/json/test/src/unit-items.cpp(689): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (auto& i : json::iterator_wrapper(j))
                                   ^

/root/json/test/src/unit-items.cpp(704): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto i : json::iterator_wrapper(j))
                                        ^

/root/json/test/src/unit-items.cpp(719): warning #1478: function "nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::iterator_wrapper(nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::const_reference) [with ObjectType=std::map, ArrayType=std::vector, StringType=std::__cxx11::string,
          BooleanType=bool, NumberIntegerType=int64_t={long}, NumberUnsignedType=uint64_t={unsigned long}, NumberFloatType=double, AllocatorType=std::allocator, JSONSerializer=nlohmann::adl_serializer]" (declared at line 13870 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              for (const auto& i : json::iterator_wrapper(j))
                                         ^

[ 84%] Linking CXX executable test-items
[ 84%] Built target test-items
Scanning dependencies of target test-regression
[ 85%] Building CXX object test/CMakeFiles/test-regression.dir/src/unit-regression.cpp.o
[ 87%] Linking CXX executable test-regression
[ 87%] Built target test-regression
Scanning dependencies of target test-class_lexer
[ 88%] Building CXX object test/CMakeFiles/test-class_lexer.dir/src/unit-class_lexer.cpp.o
[ 89%] Linking CXX executable test-class_lexer
[ 89%] Built target test-class_lexer
Scanning dependencies of target test-deserialization
[ 90%] Building CXX object test/CMakeFiles/test-deserialization.dir/src/unit-deserialization.cpp.o
/root/json/test/src/unit-deserialization.cpp(72): warning #1478: function "nlohmann::operator<<(nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::istream &)" (declared at line 15701 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              j << ss;
                ^

/root/json/test/src/unit-deserialization.cpp(129): warning #1478: function "nlohmann::operator<<(nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::istream &)" (declared at line 15701 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              CHECK_THROWS_AS(j << ss1, json::parse_error&);
              ^

/root/json/test/src/unit-deserialization.cpp(130): warning #1478: function "nlohmann::operator<<(nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::istream &)" (declared at line 15701 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              CHECK_THROWS_WITH(j << ss2,
              ^

/root/json/test/src/unit-deserialization.cpp(532): warning #1478: function "nlohmann::operator<<(nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::istream &)" (declared at line 15701 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              j << s;
                ^

/root/json/test/src/unit-deserialization.cpp(534): warning #1478: function "nlohmann::operator<<(nlohmann::basic_json<std::map, std::vector, std::__cxx11::string, bool, int64_t={long}, uint64_t={unsigned long}, double, std::allocator, nlohmann::adl_serializer> &, std::istream &)" (declared at line 15701 of "/root/json/single_include/nlohmann/json.hpp") was declared deprecated
              j << s;
                ^

[ 92%] Linking CXX executable test-deserialization
[ 92%] Built target test-deserialization
Scanning dependencies of target test-pointer_access
[ 93%] Building CXX object test/CMakeFiles/test-pointer_access.dir/src/unit-pointer_access.cpp.o
[ 94%] Linking CXX executable test-pointer_access
[ 94%] Built target test-pointer_access
Scanning dependencies of target test-conversions
[ 96%] Building CXX object test/CMakeFiles/test-conversions.dir/src/unit-conversions.cpp.o
[ 97%] Linking CXX executable test-conversions
[ 97%] Built target test-conversions
Scanning dependencies of target test-testsuites
[ 98%] Building CXX object test/CMakeFiles/test-testsuites.dir/src/unit-testsuites.cpp.o
[100%] Linking CXX executable test-testsuites
[100%] Built target test-testsuites

Note the deprecation warnings are expected - the respective functions will be removed with the 4.0.0 release.

Some tests fail:

89% tests passed, 8 tests failed out of 76

Label Time Summary:
all        = 126.92 sec (38 tests)
default    =   3.48 sec (38 tests)

Total Test time (real) = 130.43 sec

The following tests FAILED:
	 19 - test-regression_default (Failed)
	 20 - test-regression_all (Failed)
	 33 - test-json_patch_default (Failed)
	 34 - test-json_patch_all (Failed)
	 41 - test-testsuites_default (Failed)
	 42 - test-testsuites_all (Failed)
	 49 - test-to_chars_default (OTHER_FAULT)
	 50 - test-to_chars_all (OTHER_FAULT)

but this seems unrelated to this issue.

What exactly are you compiling? What are your flags?

[nlohmann]

@tomqt Could you provide more information like the program you are compiling or the compiler flags?

[stefashkaa]

I have a similar problem using the ICPC compiler.
I use the following flags:
icpc -qopenmp -Wall -otarget/main-uname -m main.cpp
Could you help me?
Best regards!