Can't use AudioServer in GDExtension due to unresolved external symbol AudioEffectInstance::_process(...)

[ComradeNixco]

When I try to build a dll without a reference to AudioServer, it builds correctly. But when I try to use the AudioServer, it refuses to build with this error:

FAILED: ../bin/win64/GameCore.windows.debug.x86_64.dll ../bin/win64/GameCore.windows.debug.x86_64.lib 
cmd.exe /C "cd . && C:\Users\User\AppData\Local\JetBrains\Toolbox\apps\CLion\ch-0\222.3345.126\bin\cmake\win\bin\cmake.exe -E vs_link_dll --intdir=CMakeFiles\SpaceFarer_GameCore.dir --rc=C:\PROGRA~2\WI3CF2~1\10\bin\100190~1.0\x86\rc.exe --mt=C:\PROGRA~2\WI3CF2~1\10\bin\100190~1.0\x86\mt.exe --manifests  -- C:\PROGRA~2\MICROS~4\2022\BUILDT~1\VC\Tools\MSVC\1432~1.313\bin\Hostx86\x64\link.exe /nologo CMakeFiles\SpaceFarer_GameCore.dir\src\nodes\audio_manager.cpp.obj CMakeFiles\SpaceFarer_GameCore.dir\src\register_types.cpp.obj  /out:..\bin\win64\GameCore.windows.debug.x86_64.dll /implib:..\bin\win64\GameCore.windows.debug.x86_64.lib /pdb:..\bin\win64\GameCore.windows.debug.x86_64.pdb /dll /version:0.0 /machine:x64 /debug /INCREMENTAL -LIBPATH:D:\Projects\Xaita\SpaceFarer\extensions\game_core\..\godot_cpp\godot_cpp\lib libgodot-cpp.windows.debug.x86_64.lib  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib  && cd ."
LINK Pass 1: command "C:\PROGRA~2\MICROS~4\2022\BUILDT~1\VC\Tools\MSVC\1432~1.313\bin\Hostx86\x64\link.exe /nologo CMakeFiles\SpaceFarer_GameCore.dir\src\nodes\audio_manager.cpp.obj CMakeFiles\SpaceFarer_GameCore.dir\src\register_types.cpp.obj /out:..\bin\win64\GameCore.windows.debug.x86_64.dll /implib:..\bin\win64\GameCore.windows.debug.x86_64.lib /pdb:..\bin\win64\GameCore.windows.debug.x86_64.pdb /dll /version:0.0 /machine:x64 /debug /INCREMENTAL -LIBPATH:D:\Projects\Xaita\SpaceFarer\extensions\game_core\..\godot_cpp\godot_cpp\lib libgodot-cpp.windows.debug.x86_64.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:CMakeFiles\SpaceFarer_GameCore.dir/intermediate.manifest CMakeFiles\SpaceFarer_GameCore.dir/manifest.res" failed (exit code 1120) with the following output:
   Creating library ..\bin\win64\GameCore.windows.debug.x86_64.lib and object ..\bin\win64\GameCore.windows.debug.x86_64.exp
libgodot-cpp.windows.debug.x86_64.lib(audio_server.windows.debug.x86_64.obj) : error LNK2001: unresolved external symbol "public: virtual void __cdecl godot::AudioEffectInstance::_process(void const *,class godot::AudioFrame *,__int64)" (?_process@AudioEffectInstance@godot@@UEAAXPEBXPEAVAudioFrame@2@_J@Z)
..\bin\win64\GameCore.windows.debug.x86_64.dll : fatal error LNK1120: 1 unresolved externals
ninja: build stopped: subcommand failed.

Example code:

#include "audio_manager.h"

#include <godot_cpp/classes/audio_server.hpp>
#include <godot_cpp/variant/utility_functions.hpp>


using namespace game_core::nodes;
using namespace godot;

AudioManager::AudioManager() : m_audioBusIndexesMap{ } {
}

void AudioManager::_bind_methods() {
    // GetVolumes
    {
        MethodInfo mi;
        mi.name = "GetVolumes";
        ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "GetVolumes", &AudioManager::GetVolumes, mi);
    }
}

void AudioManager::_ready() {
    Node::_ready();

    // Find and fill default audio bus layout's buses names
    const AudioServer* audioServer = AudioServer::get_singleton();
    UtilityFunctions::print("Initializing audio manager...");
    for (int i = 0; i < audioServer->get_bus_count(); ++i) {
        m_audioBusIndexesMap.emplace(audioServer->get_bus_name(i), i);
    }
    UtilityFunctions::print("...done");
}

Dictionary AudioManager::GetVolumes(const Variant** p_args, GDNativeInt p_argCount, GDNativeCallError& p_error) {
    int i = 0;
    if (p_argCount <= 0) {
    }

    return Dictionary{ };
}

[ComradeNixco]

I'm using cmake with clion using MSVS's toolchain to build my extension, and normally scons should use msvs too for godot-cpp

[Zylann]

Is this happening with SCons? I had a look at audio_effect_instance.cpp which is generated, and I see an implementation of AudioEffectInstance::_process inside. Note that audio_effect_instance.cpp must be compiled, even if you dont use the class directly (and AFAIK the SCons script does). If CMake doesn't, then that's the problem.