Unable to build with msys2 mingw64 for windows due to error when linking json-patch.exe

[terablade2001]

Hi.
I am trying to build this library in windows for MinGW64 with nlohmann/json 3.11.3 version, but it fails at some point.

Starting by the error I get:

[ 47%] Linking CXX executable json-patch.exe
C:/Programs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\json-patch.dir/objects.a(json-patch.cpp.obj):json-patch.cpp:(.text.startup+0x3b): undefined reference to `nlohmann::json_patch::json_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long, unsigned long long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&)'
C:/Programs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\json-patch.dir/objects.a(json-patch.cpp.obj):json-patch.cpp:(.text.startup+0x7f): undefined reference to `nlohmann::json_patch::json_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long, unsigned long long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&)'
C:/Programs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\json-patch.dir/objects.a(json-patch.cpp.obj):json-patch.cpp:(.text.startup+0xb9): undefined reference to `nlohmann::json_patch::json_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long, unsigned long long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&)'
C:/Programs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\json-patch.dir/objects.a(json-patch.cpp.obj):json-patch.cpp:(.text.startup+0xf3): undefined reference to `nlohmann::json_patch::json_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long, unsigned long long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&)'
C:/Programs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\json-patch.dir/objects.a(json-patch.cpp.obj):json-patch.cpp:(.text.startup+0x228): undefined reference to `nlohmann::json_patch::json_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long, unsigned long long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&)'
C:/Programs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\json-patch.dir/objects.a(json-patch.cpp.obj):json-patch.cpp:(.text.startup+0x3ec): more undefined references to `nlohmann::json_patch::json_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long, unsigned long long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&)' follow
collect2.exe: error: ld returned 1 exit status
mingw32-make[2]: *** [test\CMakeFiles\json-patch.dir\build.make:100: test/json-patch.exe] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:656: test/CMakeFiles/json-patch.dir/all] Error 2
mingw32-make: *** [Makefile:145: all] Error 2

Question: Is the json-schema-validator compatible up to any specific version of nlohmann/json ?

The procedure I follow is describe below.

Question: Is it ok? Am I missing something?

Trying to build with msys2 mingw64

1. Use MSYS2 and install it. Then open the executable MSYS2 MINGW64 (there are multiple executables installed).
2. Execute pacman -Syu and wait. The window will close during updating. If after 1-2 minutes it doesn't open, reopen it.
3. Execute the rest

pacman -S --needed --noconfirm mingw-w64-x86_64-toolchain
pacman -S --needed --noconfirm mingw-w64-x86_64-make mingw-w64-x86_64-cmake mingw-w64-x86_64-openssl

Now suppose we are working in folder /c/Git/external/.

Build JSON library

Clone the library:

git clone https://github.com/nlohmann/json.git
cd json
git checkout v3.11.3

From the MSYS2 MINGW64 do:

cd /c/Git/external/json
mkdir build
cd build
cmake -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=/c/Git/external/json/install ..
cmake --build . --target install -- -j8

Build the validator library

Clone the library:

git clone https://github.com/pboettch/json-schema-validator
cd json-schema-validator
git checkout 2.3.0

From the MSYS2 MINGW64 do:

cd /c/Git/external/json-schema-validator
mkdir build
cd build
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/c/Git/external/json/install/share/pkgconfig
cmake -G "MinGW Makefiles" -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=/c/Git/external/json-schema-validator/install -DCMAKE_PREFIX_PATH=/c/Git/external/json/install ..
cmake --build . --target install -- -j8

Then the initial provided error occurs.

Notes

• JSON library less than 3.11.3 can't be build with the same way. However after required local updates on some files I succeed to build JSON version 3.11.2. But again the json-schema-validator failed with the same message.