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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Build Issue: Linker errors when building with shared library option","articleBody":"**Environment**\n\n- OS: Windows on ARM64\n- Compiler: Clang (LLVM)\n- Build System: CMake with Ninja\n- Repository: socket.io-client-cpp (latest version from main branch)\n\n**Steps to Reproduce:**\n\n- Cloned the repository recursively:\n\n```\ngit clone --recursive https://github.com/socketio/socket.io-client-cpp.git\ncd socket.io-client-cpp\n```\n\n- Generated build files with CMake:\n\n`cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON`\n`ninja`\n\n**Error**\n\nThe main library seems to build but when linking the test executable, I'm getting multiple \"undefined symbol\" errors for various methods in the sio::packet class:\n\n```\n[113/113] Linking CXX executable test\\sio_test.exe\nFAILED: test/sio_test.exe\nC:\\Windows\\system32\\cmd.exe /C \"cd . \u0026\u0026 C:\\PROGRA~1\\LLVM\\bin\\CLANG_~1.EXE -nostartfiles -nostdlib -O3 -DNDEBUG -D_DLL -D_MT -Xclang --dependent-lib=msvcrt -Xlinker /subsystem:console -fuse-ld=lld-link test/CMakeFiles/sio_test.dir/sio_test.cpp.obj -o test\\sio_test.exe -Xlinker /MANIFEST:EMBED -Xlinker /implib:test\\sio_test.lib -Xlinker /pdb:test\\sio_test.pdb -Xlinker /version:0.0   _deps/catch2-build/src/Catch2Main.lib  sioclient.lib  _deps/catch2-build/src/Catch2.lib  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 -loldnames  \u0026\u0026 cd .\"\nlld-link: error: undefined symbol: public: __cdecl sio::packet::packet(class std::basic_string\u003cchar, struct std::char_traits\u003cchar\u003e, class std::allocator\u003cchar\u003e\u003e const \u0026, class std::shared_ptr\u003cclass sio::message\u003e const \u0026, int, bool)\n\u003e\u003e\u003e referenced by test/CMakeFiles/sio_test.dir/sio_test.cpp.obj:(void __cdecl CATCH2_INTERNAL_TEST_0(void))\n\u003e\u003e\u003e referenced by test/CMakeFiles/sio_test.dir/sio_test.cpp.obj:(void __cdecl CATCH2_INTERNAL_TEST_12(void))\n\nlld-link: error: undefined symbol: public: enum sio::packet::frame_type __cdecl sio::packet::get_frame(void) const\n\u003e\u003e\u003e referenced by test/CMakeFiles/sio_test.dir/sio_test.cpp.obj:(void __cdecl CATCH2_INTERNAL_TEST_0(void))\n```\n","author":{"url":"https://github.com/TheGorge7","@type":"Person","name":"TheGorge7"},"datePublished":"2025-04-09T03:56:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/438/socket.io-client-cpp/issues/438"}