fails to build on Mac

[ali-beep]

Hi,

This project looks really nice, but I am not able to build it on my Mac. Relevant commands and outputs

% cmake -GNinja -Bbuild
-- The CXX compiler identification is AppleClang 16.0.0.16000026
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done (1.7s)
-- Generating done (0.0s)
-- Build files have been written to: /tmp/simple-protobuf/build
% cmake --build build
[5/9] Building CXX object src/spb-prot...MakeFiles/spb-protoc.dir/ast/ast.cpp.o
FAILED: src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/ast/ast.cpp.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/src/spb-proto-compiler -I/tmp/simple-protobuf/include -std=c++20 -flto=thin -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -MD -MT src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/ast/ast.cpp.o -MF src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/ast/ast.cpp.o.d -o src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/ast/ast.cpp.o -c /tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp
/tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp:33:25: error: no member named 'any_of' in namespace 'std::ranges'
   33 |     return std::ranges::any_of( imports, [ = ]( const auto & import ) -> bool
      |            ~~~~~~~~~~~~~^
/tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp:39:25: error: no member named 'any_of' in namespace 'std::ranges'
   39 |     return std::ranges::any_of( enums, [ = ]( const auto & enum_field ) -> bool
      |            ~~~~~~~~~~~~~^
/tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp:45:25: error: no member named 'any_of' in namespace 'std::ranges'
   45 |     return std::ranges::any_of( messages, [ = ]( const auto & message ) -> bool
      |            ~~~~~~~~~~~~~^
/tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp:52:25: error: no member named 'any_of' in namespace 'std::ranges'
   52 |     return std::ranges::any_of( messages, [ = ]( const auto & message ) -> bool
      |            ~~~~~~~~~~~~~^
/tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp:58:25: error: no member named 'any_of' in namespace 'std::ranges'
   58 |     return std::ranges::any_of( oneofs, [ = ]( const auto & oneof ) -> bool
      |            ~~~~~~~~~~~~~^
/tmp/simple-protobuf/src/spb-proto-compiler/ast/ast.cpp:226:25: error: no member named 'all_of' in namespace 'std::ranges'
  226 |     return std::ranges::all_of( messages,
      |            ~~~~~~~~~~~~~^
6 errors generated.
[6/9] Building CXX object src/spb-prot...les/spb-protoc.dir/parser/parser.cpp.o
FAILED: src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/src/spb-proto-compiler -I/tmp/simple-protobuf/include -std=c++20 -flto=thin -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -MD -MT src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o -MF src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o.d -o src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o -c /tmp/simple-protobuf/src/spb-proto-compiler/parser/parser.cpp
/tmp/simple-protobuf/src/spb-proto-compiler/parser/parser.cpp:196:16: error: no matching constructor for initialization of 'std::string_view' (aka 'basic_string_view<char>')
  196 |         return { start, result.ptr };
      |                ^~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:267:5: note: candidate constructor not viable: no known conversion from 'const char *' to 'size_type' (aka 'unsigned long') for 2nd argument; dereference the argument with *
  267 |     basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT
      |     ^                                    ~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:261:5: note: candidate constructor not viable: requires 1 argument, but 2 were provided
  261 |     basic_string_view(const basic_string_view&) _NOEXCEPT = default;
      |     ^                 ~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:276:5: note: candidate constructor not viable: requires single argument '__s', but 2 arguments were provided
  276 |     basic_string_view(const _CharT* __s)
      |     ^                 ~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:258:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
  258 |     basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}
      |     ^
/tmp/simple-protobuf/src/spb-proto-compiler/parser/parser.cpp:447:12: error: no matching constructor for initialization of 'std::string_view' (aka 'basic_string_view<char>')
  447 |     return std::string_view{ ident.begin( ), ident2.end( ) };
      |            ^               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:267:5: note: candidate constructor not viable: no known conversion from 'const_iterator' (aka 'const char *') to 'size_type' (aka 'unsigned long') for 2nd argument; dereference the argument with *
  267 |     basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT
      |     ^                                    ~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:261:5: note: candidate constructor not viable: requires 1 argument, but 2 were provided
  261 |     basic_string_view(const basic_string_view&) _NOEXCEPT = default;
      |     ^                 ~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:276:5: note: candidate constructor not viable: requires single argument '__s', but 2 arguments were provided
  276 |     basic_string_view(const _CharT* __s)
      |     ^                 ~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:258:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
  258 |     basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}
      |     ^
2 errors generated.
[8/9] Building CXX object src/spb-prot...pb-protoc.dir/dumper/json/dumper.cpp.o
ninja: build stopped: subcommand failed.

[tonda-kriz]

Hi @ali-beep,

Thank you for the bug report.

I don't own a mac but I've added more macOS environments to the tests and I've made some adjustments so it should work now, could you please try to build it from this branch bug/fails-to-build-on-mac?

[ali-beep]

This is the only error now; looks like only the C++17 string_view constructors are provided

an19081@576793-MITLL:/tmp/simple-protobuf (git)-[bug/fails-to-build-on-mac]-% cmake --build build
[1/2] Building CXX object src/spb-prot...les/spb-protoc.dir/parser/parser.cpp.o
FAILED: src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/src/spb-proto-compiler -I/tmp/simple-protobuf/include -std=c++20 -flto=thin -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -MD -MT src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o -MF src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o.d -o src/spb-proto-compiler/CMakeFiles/spb-protoc.dir/parser/parser.cpp.o -c /tmp/simple-protobuf/src/spb-proto-compiler/parser/parser.cpp
/tmp/simple-protobuf/src/spb-proto-compiler/parser/parser.cpp:446:12: error: no matching constructor for initialization of 'std::string_view' (aka 'basic_string_view<char>')
  446 |     return std::string_view{ ident.begin( ), ident2.end( ) };
      |            ^               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:267:5: note: candidate constructor not viable: no known conversion from 'const_iterator' (aka 'const char *') to 'size_type' (aka 'unsigned long') for 2nd argument; dereference the argument with *
  267 |     basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT
      |     ^                                    ~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:261:5: note: candidate constructor not viable: requires 1 argument, but 2 were provided
  261 |     basic_string_view(const basic_string_view&) _NOEXCEPT = default;
      |     ^                 ~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:276:5: note: candidate constructor not viable: requires single argument '__s', but 2 arguments were provided
  276 |     basic_string_view(const _CharT* __s)
      |     ^                 ~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:258:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
  258 |     basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}
      |     ^
1 error generated.
ninja: build stopped: subcommand failed.

[tonda-kriz]

OK, try now please

[ali-beep]

Thanks for the fast turnaround. It builds now, but not with building tests enabled (so the generated code may not work). Apologies for the large output; probably seeing the same error triggered multiple times

% cmake --build build
[36/47] Building CXX object test/CMakeFiles/compiled-protos.dir/proto3.pb.cc.o
FAILED: test/CMakeFiles/compiled-protos.dir/proto3.pb.cc.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -Wno-deprecated-declarations -Wno-deprecated -MD -MT test/CMakeFiles/compiled-protos.dir/proto3.pb.cc.o -MF test/CMakeFiles/compiled-protos.dir/proto3.pb.cc.o.d -o test/CMakeFiles/compiled-protos.dir/proto3.pb.cc.o -c /tmp/simple-protobuf/build/test/proto3.pb.cc
In file included from /tmp/simple-protobuf/build/test/proto3.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/proto3.pb.h:3:
In file included from /tmp/simple-protobuf/build/test/message.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:310:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  310 |             serialize( stream, { }, v );
      |             ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::vector<float>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/proto3.pb.cc:99:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::vector<float>>' requested here
   99 |     stream.serialize( "packed_float"sv, value.packed_float );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<float>::value' was not satisfied [with _Tp = float]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/proto3.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/proto3.pb.h:3:
In file included from /tmp/simple-protobuf/build/test/message.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:310:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  310 |             serialize( stream, { }, v );
      |             ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::vector<double>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/proto3.pb.cc:100:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::vector<double>>' requested here
  100 |     stream.serialize( "packed_double"sv, value.packed_double );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/proto3.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/proto3.pb.h:3:
In file included from /tmp/simple-protobuf/build/test/message.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
4 errors generated.
[37/47] Building CXX object test/CMakeFiles/json-test.dir/scalar.pb.cc.o
FAILED: test/CMakeFiles/json-test.dir/scalar.pb.cc.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -MD -MT test/CMakeFiles/json-test.dir/scalar.pb.cc.o -MF test/CMakeFiles/json-test.dir/scalar.pb.cc.o.d -o test/CMakeFiles/json-test.dir/scalar.pb.cc.o -c /tmp/simple-protobuf/build/test/scalar.pb.cc
In file included from /tmp/simple-protobuf/build/test/scalar.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/scalar.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:361:16: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  361 |         return serialize( stream, key, *p_value );
      |                ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::optional<float>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/scalar.pb.cc:2312:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::optional<float>>' requested here
 2312 |     stream.serialize( "value"sv, value.value );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<float>::value' was not satisfied [with _Tp = float]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/scalar.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/scalar.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:361:16: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  361 |         return serialize( stream, key, *p_value );
      |                ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::optional<double>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/scalar.pb.cc:2375:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::optional<double>>' requested here
 2375 |     stream.serialize( "value"sv, value.value );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/scalar.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/scalar.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
4 errors generated.
[38/47] Building CXX object test/CMakeFiles/pb-test.dir/scalar.pb.cc.o
FAILED: test/CMakeFiles/pb-test.dir/scalar.pb.cc.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -MD -MT test/CMakeFiles/pb-test.dir/scalar.pb.cc.o -MF test/CMakeFiles/pb-test.dir/scalar.pb.cc.o.d -o test/CMakeFiles/pb-test.dir/scalar.pb.cc.o -c /tmp/simple-protobuf/build/test/scalar.pb.cc
In file included from /tmp/simple-protobuf/build/test/scalar.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/scalar.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:361:16: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  361 |         return serialize( stream, key, *p_value );
      |                ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::optional<float>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/scalar.pb.cc:2312:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::optional<float>>' requested here
 2312 |     stream.serialize( "value"sv, value.value );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<float>::value' was not satisfied [with _Tp = float]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/scalar.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/scalar.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:361:16: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  361 |         return serialize( stream, key, *p_value );
      |                ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::optional<double>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/scalar.pb.cc:2375:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::optional<double>>' requested here
 2375 |     stream.serialize( "value"sv, value.value );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/scalar.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/scalar.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
4 errors generated.
[39/47] Building CXX object test/CMakeFiles/compiled-protos.dir/desc.pb.cc.o
FAILED: test/CMakeFiles/compiled-protos.dir/desc.pb.cc.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -Wno-deprecated-declarations -Wno-deprecated -MD -MT test/CMakeFiles/compiled-protos.dir/desc.pb.cc.o -MF test/CMakeFiles/compiled-protos.dir/desc.pb.cc.o.d -o test/CMakeFiles/compiled-protos.dir/desc.pb.cc.o -c /tmp/simple-protobuf/build/test/desc.pb.cc
In file included from /tmp/simple-protobuf/build/test/desc.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/desc.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:361:16: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  361 |         return serialize( stream, key, *p_value );
      |                ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<std::optional<double>>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/desc.pb.cc:196:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::optional<double>>' requested here
  196 |     stream.serialize( "double_value"sv, value.double_value );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/desc.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/desc.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
2 errors generated.
[41/47] Building CXX object test/CMakeFiles/compiled-protos.dir/map.pb.cc.o
FAILED: test/CMakeFiles/compiled-protos.dir/map.pb.cc.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -Wno-deprecated-declarations -Wno-deprecated -MD -MT test/CMakeFiles/compiled-protos.dir/map.pb.cc.o -MF test/CMakeFiles/compiled-protos.dir/map.pb.cc.o.d -o test/CMakeFiles/compiled-protos.dir/map.pb.cc.o -c /tmp/simple-protobuf/build/test/map.pb.cc
In file included from /tmp/simple-protobuf/build/test/map.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/map.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:349:9: note: in instantiation of function template specialization 'spb::json::detail::serialize<float>' requested here
  349 |         serialize( stream, no_name, map_value );
      |         ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<int, float>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/map.pb.cc:808:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::map<int, float>>' requested here
  808 |     stream.serialize( "map_floats"sv, value.map_floats );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<float>::value' was not satisfied [with _Tp = float]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/map.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/map.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:349:9: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  349 |         serialize( stream, no_name, map_value );
      |         ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<int, double>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/map.pb.cc:809:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<std::map<int, double>>' requested here
  809 |     stream.serialize( "map_doubles"sv, value.map_doubles );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/map.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/map.pb.h:7:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
4 errors generated.
[42/47] Building CXX object test/CMakeFiles/json-test.dir/json.cpp.o
FAILED: test/CMakeFiles/json-test.dir/json.cpp.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -MD -MT test/CMakeFiles/json-test.dir/json.cpp.o -MF test/CMakeFiles/json-test.dir/json.cpp.o.d -o test/CMakeFiles/json-test.dir/json.cpp.o -c /tmp/simple-protobuf/test/json.cpp
In file included from /tmp/simple-protobuf/test/json.cpp:3:
In file included from /tmp/simple-protobuf/build/test/name.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:404:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  404 |     serialize( stream, no_name, value );
      |     ^
/tmp/simple-protobuf/include/spb/json.hpp:30:20: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
   30 |     return detail::serialize( message, on_write );
      |                    ^
/tmp/simple-protobuf/include/spb/json.hpp:64:5: note: in instantiation of function template specialization 'spb::json::serialize<double>' requested here
   64 |     serialize( message, writer );
      |     ^
/tmp/simple-protobuf/include/spb/json.hpp:80:5: note: in instantiation of function template specialization 'spb::json::serialize<double, std::string>' requested here
   80 |     serialize< Message, Container >( message, result );
      |     ^
/tmp/simple-protobuf/test/json.cpp:757:31: note: in instantiation of function template specialization 'spb::json::serialize<std::string, double>' requested here
  757 |             CHECK( spb::json::serialize( 42.0 ) == "42" );
      |                               ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/test/json.cpp:3:
In file included from /tmp/simple-protobuf/build/test/name.pb.h:6:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
2 errors generated.
[43/47] Building CXX object test/CMakeFiles/compiled-protos.dir/mesos.pb.cc.o
FAILED: test/CMakeFiles/compiled-protos.dir/mesos.pb.cc.o 
/Library/Developer/CommandLineTools/usr/bin/c++  -I/tmp/simple-protobuf/include -I/tmp/simple-protobuf/build/test -std=c++20 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk -Wall -Wextra -Wpedantic -Werror -Wno-missing-field-initializers -Wno-deprecated-declarations -Wno-deprecated -MD -MT test/CMakeFiles/compiled-protos.dir/mesos.pb.cc.o -MF test/CMakeFiles/compiled-protos.dir/mesos.pb.cc.o.d -o test/CMakeFiles/compiled-protos.dir/mesos.pb.cc.o -c /tmp/simple-protobuf/build/test/mesos.pb.cc
In file included from /tmp/simple-protobuf/build/test/mesos.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/mesos.pb.h:8:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:19: error: call to deleted function 'to_chars'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |                   ^~~~~~~~~~~~~
/tmp/simple-protobuf/include/spb/json/serialize.hpp:266:5: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  266 |     serialize( stream, value );
      |     ^
/tmp/simple-protobuf/include/spb/json/serialize.hpp:410:13: note: in instantiation of function template specialization 'spb::json::detail::serialize<double>' requested here
  410 |     detail::serialize( *this, key, value );
      |             ^
/tmp/simple-protobuf/build/test/mesos.pb.cc:1638:12: note: in instantiation of function template specialization 'spb::json::detail::ostream::serialize<double>' requested here
 1638 |     stream.serialize( "value"sv, value.value );
      |            ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:166:6: note: candidate function has been explicitly deleted
  166 | void to_chars(char*, char*, bool, int = 10) = delete;
      |      ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:450:1: note: candidate template ignored: requirement 'is_integral<double>::value' was not satisfied [with _Tp = double]
  450 | to_chars(char* __first, char* __last, _Tp __value)
      | ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/charconv:458:1: note: candidate function template not viable: requires 4 arguments, but 3 were provided
  458 | to_chars(char* __first, char* __last, _Tp __value, int __base)
      | ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /tmp/simple-protobuf/build/test/mesos.pb.cc:1:
In file included from /tmp/simple-protobuf/build/test/mesos.pb.h:8:
In file included from /tmp/simple-protobuf/include/spb/json.hpp:14:
/tmp/simple-protobuf/include/spb/json/serialize.hpp:251:10: error: variable has incomplete type 'void'
  251 |     auto result = std::to_chars( buffer.data( ), buffer.data( ) + sizeof( buffer ), value );
      |          ^
2 errors generated.
[44/47] Building CXX object test/CMakeFiles/pb-test.dir/pb.cpp.o
ninja: build stopped: subcommand failed.

[tonda-kriz]

I've fixed the std::to_chars, could you please try it now?

[ali-beep]

Tests and build compile; tests pass. Thanks!

[tonda-kriz]

Thank you