Hi Hernan,
Nlohmann json got updated to 3.11.3 in
https://github.com/qgis/QGIS/pull/61597 a few days ago, maybe you
could try building master before that?
Best
Stefanos
On Tue, Apr 29, 2025, 10:04 AM Hernán De Angelis via QGIS-Developer
<qgis-developer@lists.osgeo.org> wrote:
Hi
I seek help in understanding errors (see excerpt below) I am
currently experiencing while building QGIS master in a fresh
openSUSE Tumbleweed install. These errors seem to originate in
nlohmann json. I am used to compile QGIS from source but never
seen these errors before and have trouble figuring out where they
originate and what a possible solution could be.
I am using Qt 6.9.0, and tried compiling using both GCC 14 and 15.
Passing the CXX flag "-std=c++17" does not seem to help. I tried
using NLOHMANN both internal and also using the latest version
compiled locally (3.12, as in error log below) but both fail in a
similar way.
I compiled QGIS master as late as 6 april without problems in a
previous openSUSE install. There is a very real the possibility
that recent changes in GCC14 and 15 regarding required standards
are playing a part here, as well as packaging changes in openSUSE
Tumbleweed. However, as I am unsure what the cause may be I would
like to ask the developers if these errors look familiar to you
and if they suggest something.
Thanks in advance
Hernán
[ 12%] Built target staged-plugins-on-build
In file included from
/usr/local/src/QGIS/external/nlohmann/detail/value_t.hpp:16,
from
/usr/local/src/QGIS/external/nlohmann/detail/exceptions.hpp:20,
from
/usr/local/src/QGIS/external/nlohmann/detail/conversions/from_json.hpp:23,
from
/usr/local/src/QGIS/external/nlohmann/adl_serializer.hpp:14,
from
/usr/local/src/QGIS/external/nlohmann/json.hpp:34,
from
/usr/local/src/QGIS/external/pdal_wrench/vpc.cpp:26:
/usr/local/src/QGIS/external/nlohmann/detail/macro_scope.hpp:257:63:
error: wrong number of template arguments (11, should be at least 0)
257 | AllocatorType, JSONSerializer, BinaryType,
CustomBaseClass>
| ^
/usr/local/src/QGIS/external/nlohmann/detail/meta/type_traits.hpp:53:22:
note: in expansion of macro ‘NLOHMANN_BASIC_JSON_TPL’
53 | struct is_basic_json<NLOHMANN_BASIC_JSON_TPL> :
std::true_type {};
| ^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/pdal/PDALUtils.hpp:39,
from /usr/local/include/pdal/PointRef.hpp:37,
from /usr/local/include/pdal/Geometry.hpp:37,
from
/usr/local/src/QGIS/external/pdal_wrench/vpc.hpp:18,
from
/usr/local/src/QGIS/external/pdal_wrench/vpc.cpp:19:
/usr/local/include/pdal/JsonFwd.hpp:40:7: note: provided for
‘template<template<class U, class V, class ... Args> class
ObjectType, template<class U, class ... Args> class ArrayType,
class StringType, class BooleanType, class NumberIntegerType,
class NumberUnsignedType, class NumberFloatType, template<class U>
class AllocatorType, template<class T, class SFINAE> class
JSONSerializer, class BinaryType> class nlohmann::basic_json’
40 | class basic_json;
| ^~~~~~~~~~
In file included from
/usr/local/src/QGIS/external/nlohmann/detail/exceptions.hpp:25:
/usr/local/src/QGIS/external/nlohmann/detail/meta/type_traits.hpp:53:45:
error: template argument 1 is invalid
53 | struct is_basic_json<NLOHMANN_BASIC_JSON_TPL> :
std::true_type {};
| ^
/usr/local/src/QGIS/external/nlohmann/detail/macro_scope.hpp:257:63:
error: wrong number of template arguments (11, should be at least 0)
257 | AllocatorType, JSONSerializer, BinaryType,
CustomBaseClass>
| ^
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:51:28:
note: in expansion of macro ‘NLOHMANN_BASIC_JSON_TPL’
51 | struct string_t_helper<NLOHMANN_BASIC_JSON_TPL>
| ^~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:40:7: note: provided for
‘template<template<class U, class V, class ... Args> class
ObjectType, template<class U, class ... Args> class ArrayType,
class StringType, class BooleanType, class NumberIntegerType,
class NumberUnsignedType, class NumberFloatType, template<class U>
class AllocatorType, template<class T, class SFINAE> class
JSONSerializer, class BinaryType> class nlohmann::basic_json’
40 | class basic_json;
| ^~~~~~~~~~
In file included from
/usr/local/src/QGIS/external/nlohmann/json.hpp:50:
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:51:51:
error: template argument 1 is invalid
51 | struct string_t_helper<NLOHMANN_BASIC_JSON_TPL>
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:104:30: error:
reference to ‘json_pointer’ is ambiguous
104 | friend class ::nlohmann::json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:166:26: error:
reference to ‘json_pointer’ is ambiguous
166 | using json_pointer = ::nlohmann::json_pointer<StringType>;
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2327:21: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
2327 | ValueType value(const json_pointer& ptr, const
ValueType& default_value) const
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2352:22: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
2352 | ReturnType value(const json_pointer& ptr, ValueType &&
default_value) const
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2376:27: error:
reference to ‘json_pointer’ is ambiguous
2376 | ValueType value(const
::nlohmann::json_pointer<BasicJsonType>& ptr, const ValueType&
default_value) const
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2376:51: error:
expected ‘,’ or ‘...’ before ‘<’ token
2376 | ValueType value(const
::nlohmann::json_pointer<BasicJsonType>& ptr, const ValueType&
default_value) const
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:2387:28: error:
reference to ‘json_pointer’ is ambiguous
2387 | ReturnType value(const
::nlohmann::json_pointer<BasicJsonType>& ptr, ValueType &&
default_value) const
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2387:52: error:
expected ‘,’ or ‘...’ before ‘<’ token
2387 | ReturnType value(const
::nlohmann::json_pointer<BasicJsonType>& ptr, ValueType &&
default_value) const
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:2745:19: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
2745 | bool contains(const json_pointer& ptr) const
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2752:46: error:
reference to ‘json_pointer’ is ambiguous
2752 | bool contains(const typename
::nlohmann::json_pointer<BasicJsonType>& ptr) const
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:2752:58: error:
expected ‘,’ or ‘...’ before ‘<’ token
2752 | bool contains(const typename
::nlohmann::json_pointer<BasicJsonType>& ptr) const
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:4618:26: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
4618 | reference operator[](const json_pointer& ptr)
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4618:15: error:
‘nlohmann::json_abi_v3_11_3::basic_json<ObjectType, ArrayType,
StringType, BooleanType, NumberIntegerType, NumberUnsignedType,
NumberFloatType, AllocatorType, JSONSerializer, BinaryType,
CustomBaseClass>::value_type&
nlohmann::json_abi_v3_11_3::basic_json<ObjectType, ArrayType,
StringType, BooleanType, NumberIntegerType, NumberUnsignedType,
NumberFloatType, AllocatorType, JSONSerializer, BinaryType,
CustomBaseClass>::operator[](...)’ must not have variable number
of arguments
4618 | reference operator[](const json_pointer& ptr)
| ^~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4625:32: error:
reference to ‘json_pointer’ is ambiguous
4625 | reference operator[](const
::nlohmann::json_pointer<BasicJsonType>& ptr)
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4625:56: error:
expected ‘,’ or ‘...’ before ‘<’ token
4625 | reference operator[](const
::nlohmann::json_pointer<BasicJsonType>& ptr)
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:4632:32: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
4632 | const_reference operator[](const json_pointer& ptr) const
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4632:21: error:
‘const nlohmann::json_abi_v3_11_3::basic_json<ObjectType,
ArrayType, StringType, BooleanType, NumberIntegerType,
NumberUnsignedType, NumberFloatType, AllocatorType,
JSONSerializer, BinaryType, CustomBaseClass>::value_type&
nlohmann::json_abi_v3_11_3::basic_json<ObjectType, ArrayType,
StringType, BooleanType, NumberIntegerType, NumberUnsignedType,
NumberFloatType, AllocatorType, JSONSerializer, BinaryType,
CustomBaseClass>::operator[](...) const’ must not have variable
number of arguments
4632 | const_reference operator[](const json_pointer& ptr) const
| ^~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4639:38: error:
reference to ‘json_pointer’ is ambiguous
4639 | const_reference operator[](const
::nlohmann::json_pointer<BasicJsonType>& ptr) const
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4639:62: error:
expected ‘,’ or ‘...’ before ‘<’ token
4639 | const_reference operator[](const
::nlohmann::json_pointer<BasicJsonType>& ptr) const
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:4646:18: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
4646 | reference at(const json_pointer& ptr)
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4653:24: error:
reference to ‘json_pointer’ is ambiguous
4653 | reference at(const
::nlohmann::json_pointer<BasicJsonType>& ptr)
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4653:48: error:
expected ‘,’ or ‘...’ before ‘<’ token
4653 | reference at(const
::nlohmann::json_pointer<BasicJsonType>& ptr)
| ^
/usr/local/src/QGIS/external/nlohmann/json.hpp:4660:24: error:
missing template argument list after
‘nlohmann::json_abi_v3_11_3::json_pointer’; template placeholder
not permitted in parameter
4660 | const_reference at(const json_pointer& ptr) const
| ^~~~~
| <>
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’ declared here
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4667:30: error:
reference to ‘json_pointer’ is ambiguous
4667 | const_reference at(const
::nlohmann::json_pointer<BasicJsonType>& ptr) const
| ^~
/usr/local/src/QGIS/external/nlohmann/detail/json_pointer.hpp:35:7:
note: candidates are: ‘template<class RefStringType> class
nlohmann::json_abi_v3_11_3::json_pointer’
35 | class json_pointer
| ^~~~~~~~~~~~
/usr/local/include/pdal/JsonFwd.hpp:45:7: note:
‘template<class BasicJsonType> class nlohmann::json_pointer’
45 | class json_pointer;
| ^~~~~~~~~~~~
/usr/local/src/QGIS/external/nlohmann/json.hpp:4667:54: error:
expected ‘,’ or ‘...’ before ‘<’ token
4667 | const_reference at(const
::nlohmann::json_pointer<BasicJsonType>& ptr) const
| ^
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