Yup. That’s the file.
I should have taken note of the path. 
Wow. Just look at those errors:
Creating library bin\libsimple.lib and object bin\libsimple.exp
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::String::String(void)" (??0String@godot@@QAE@XZ) referenced in function "public:__thiscall SimpleClass::SimpleClass(void)" (??0SimpleClass@@QAE@XZ)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::String::String(char const *)" (??0String@godot@@QAE@PBD@Z) referenced in function "void __cdecl godot::register_property<class SimpleClass,class godot::String>(char const *,class godot::String SimpleClass::*,class godot::String,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@VString@godot@@@godot@@YAXPBDPQSimpleClass@@VString@0@V20@W4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@2@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::String::String(class godot::String const &)" (??0String@godot@@QAE@ABV01@@Z) referenced in function "void __cdecl godot::register_property<class SimpleClass,int>(char const *,void (__thiscall SimpleClass::*)(int),int (__thiscall SimpleClass::*)(void)const ,int,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@H@godot@@YAXPBDP8SimpleClass@@AEXH@ZP81@BEHXZHW4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@VString@0@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::String::~String(void)" (??1String@godot@@QAE@XZ) referenced in function "void __cdecl godot::register_property<class SimpleClass,int>(char const *,void (__thiscall SimpleClass::*)(int),int (__thiscall SimpleClass::*)(void),int,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@H@godot@@YAXPBDP8SimpleClass@@AEXH@ZP81@AEHXZHW4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@VString@0@@Z)
init.obj : error LNK2019: unresolved external symbol "public: void __thiscall godot::String::operator=(class godot::String &&)" (??4String@godot@@QAEX$$QAV01@@Z) referenced in function "void __cdecl godot::register_property<class SimpleClass,class godot::String>(char const *,class godot::String SimpleClass::*,class godot::String,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@VString@godot@@@godot@@YAXPBDPQSimpleClass@@VString@0@V20@W4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@2@Z)
init.obj : error LNK2019: unresolved external symbol "public: static void __cdecl godot::Godot::gdnative_init(struct godot_gdnative_init_options *)" (?gdnative_init@Godot@godot@@SAXPAUgodot_gdnative_init_options@@@Z) referenced in function_godot_gdnative_init
init.obj : error LNK2019: unresolved external symbol "public: static void __cdecl godot::Godot::gdnative_terminate(struct godot_gdnative_terminate_options *)" (?gdnative_terminate@Godot@godot@@SAXPAUgodot_gdnative_terminate_options@@@Z) referenced in function _godot_gdnative_terminate
init.obj : error LNK2019: unresolved external symbol "public: static void __cdecl godot::Godot::nativescript_init(void *)" (?nativescript_init@Godot@godot@@SAXPAX@Z) referenced in function _godot_nativescript_init
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::Variant(void)" (??0Variant@godot@@QAE@XZ) referenced in function "public: class godot::Variant __thiscall SimpleClass::method(class godot::Variant)" (?method@SimpleClass@@QAE?AVVariant@godot@@V23@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::Variant(class godot::Variant const &)" (??0Variant@godot@@QAE@ABV01@@Z) referenced in function "public: void __thiscall godot::_WrappedMethod<class SimpleClass,class godot::Variant,class godot::Variant>::apply<0>(class godot::Variant *,class SimpleClass *,class godot::Variant * *,struct godot::__Sequence<0>)"(??$apply@$0A@@?$_WrappedMethod@VSimpleClass@@VVariant@godot@@V23@@godot@@QAEXPAVVariant@1@PAVSimpleClass@@PAPAV21@U?$__Sequence@$0A@@1@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::Variant(int)" (??0Variant@godot@@QAE@H@Z) referenced in function "void__cdecl godot::register_property<class SimpleClass,int>(char const *,void (__thiscall SimpleClass::*)(int),int (__thiscall SimpleClass::*)(void),int,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@H@godot@@YAXPBDP8SimpleClass@@AEXH@ZP81@AEHXZHW4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@VString@0@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::Variant(class godot::String const &)" (??0Variant@godot@@QAE@ABVString@1@@Z) referenced in function "void __cdecl godot::register_property<class SimpleClass,class godot::String>(char const *,class godot::String SimpleClass::*,class godot::String,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@VString@godot@@@godot@@YAXPBDPQSimpleClass@@VString@0@V20@W4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@2@Z)
init.obj : error LNK2019: unresolved external symbol "public: class godot::Variant & __thiscall godot::Variant::operator=(class godot::Variant const &)" (??4Variant@godot@@QAEAAV01@ABV01@@Z) referenced in function "public: void __thiscall godot::_WrappedMethod<class SimpleClass,class godot::Variant,class godot::Variant>::apply<0>(class godot::Variant *,class SimpleClass *,class godot::Variant * *,struct godot::__Sequence<0>)" (??$apply@$0A@@?$_WrappedMethod@VSimpleClass@@VVariant@godot@@V23@@godot@@QAEXPAVVariant@1@PAVSimpleClass@@PAPAV21@U?$__Sequence@$0A@@1@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::operator int(void)const " (??BVariant@godot@@QBEHXZ) referenced in function "public: static int __cdecl godot::_ArgCast<int>::_arg_cast(class godot::Variant)" (?_arg_cast@?$_ArgCast@H@godot@@SAHVVariant@2@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::operator class godot::String(void)const " (??BVariant@godot@@QBE?AVString@1@XZ) referenced in function "public: static class godot::String __cdecl godot::_ArgCast<class godot::String>::_arg_cast(class godot::Variant)" (?_arg_cast@?$_ArgCast@VString@godot@@@godot@@SA?AVString@2@VVariant@2@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::operator void *(void)const " (??BVariant@godot@@QBEPAXXZ) referenced in function "void __cdecl godot::register_property<class SimpleClass,class godot::String>(char const *,class godot::String SimpleClass::*,class godot::String,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@VString@godot@@@godot@@YAXPBDPQSimpleClass@@VString@0@V20@W4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@2@Z)
init.obj : error LNK2019: unresolved external symbol "public: enum godot::Variant::Type __thiscall godot::Variant::get_type(void)const " (?get_type@Variant@godot@@QBE?AW4Type@12@XZ) referenced in function "void __cdecl godot::register_property<class SimpleClass,int>(char const *,void (__thiscall SimpleClass::*)(int),int (__thiscall SimpleClass::*)(void),int,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@H@godot@@YAXPBDP8SimpleClass@@AEXH@ZP81@AEHXZHW4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@VString@0@@Z)
init.obj : error LNK2019: unresolved external symbol "public: __thiscall godot::Variant::~Variant(void)" (??1Variant@godot@@QAE@XZ) referenced in function "public: void __thiscall godot::_WrappedMethod<class SimpleClass,class godot::Variant,class godot::Variant>::apply<0>(class godot::Variant *,class SimpleClass *,class godot::Variant * *,struct godot::__Sequence<0>)" (??$apply@$0A@@?$_WrappedMethod@VSimpleClass@@VVariant@godot@@V23@@godot@@QAEXPAVVariant@1@PAVSimpleClass@@PAPAV21@U?$__Sequence@$0A@@1@@Z)
init.obj : error LNK2019: unresolved external symbol "void __cdecl godot::_TagDB::register_type(unsigned int,unsigned int)" (?register_type@_TagDB@godot@@YAXII@Z) referenced in function "void __cdecl godot::register_class<class SimpleClass>(void)" (??$register_class@VSimpleClass@@@godot@@YAXXZ)
init.obj : error LNK2019: unresolved external symbol "public: class godot::String __thiscall godot::Object::get_class(void)const " (?get_class@Object@godot@@QBE?AVString@2@XZ) referenced in function "void __cdecl godot::register_property<class SimpleClass,class godot::String>(char const *,class godot::String SimpleClass::*,class godot::String,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@VString@godot@@@godot@@YAXPBDPQSimpleClass@@VString@0@V20@W4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@2@Z)
init.obj : error LNK2019: unresolved external symbol "public: bool __thiscall godot::Object::is_class(class godot::String)const " (?is_class@Object@godot@@QBE_NVString@2@@Z) referenced in function "void __cdecl godot::register_property<class SimpleClass,class godot::String>(char const *,class godot::String SimpleClass::*,class godot::String,enum godot_method_rpc_mode,enum godot_property_usage_flags,enum godot_property_hint,class godot::String)" (??$register_property@VSimpleClass@@VString@godot@@@godot@@YAXPBDPQSimpleClass@@VString@0@V20@W4godot_method_rpc_mode@@W4godot_property_usage_flags@@W4godot_property_hint@@2@Z)
init.obj : error LNK2019: unresolved external symbol _api referenced in function "void * __cdecl godot::___make_wrapper_function<class SimpleClass,class godot::Variant,class godot::Variant>(class godot::Variant (__thiscall SimpleClass::*)(class godot::Variant))" (??$___make_wrapper_function@VSimpleClass@@VVariant@godot@@V23@@godot@@YAPAXP8SimpleClass@@AE?AVVariant@0@V20@@Z@Z)
init.obj : error LNK2019: unresolved external symbol _nativescript_api referenced in function "void __cdecl godot::register_class<class SimpleClass>(void)" (??$register_class@VSimpleClass@@@godot@@YAXXZ)
init.obj : error LNK2019: unresolved external symbol _nativescript_1_1_api referenced in function "class godot::Object * __cdecl godot::detail::get_wrapper<class godot::Object>(void *)" (??$get_wrapper@VObject@godot@@@detail@godot@@YAPAVObject@1@PAX@Z)
init.obj : error LNK2019: unresolved external symbol "public: static void * godot::_RegisterState::nativescript_handle" (?nativescript_handle@_RegisterState@godot@@2PAXA) referenced in function "void __cdecl godot::register_class<class SimpleClass>(void)" (??$register_class@VSimpleClass@@@godot@@YAXXZ)
init.obj : error LNK2019: unresolved external symbol "public: static int godot::_RegisterState::language_index" (?language_index@_RegisterState@godot@@2HA) referenced in function "class godot::Object * __cdecl godot::detail::get_wrapper<class godot::Object>(void *)" (??$get_wrapper@VObject@godot@@@detail@godot@@YAPAVObject@1@PAX@Z)
init.obj : error LNK2019: unresolved external symbol "private: static void * godot::Reference::_detail_class_tag" (?_detail_class_tag@Reference@godot@@0PAXA) referenced in function "public: static unsigned int __cdecl godot::Reference::___get_id(void)" (?___get_id@Reference@godot@@SAIXZ)
godot-cpp\bin\libgodot-cpp.windows.debug.64.lib : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
bin\libtest.dll : fatal error LNK1120: 27 unresolved externals
Has anyone else had problems using SCons with these libraries?
I was directed here from github. Is there anyone here who can help me with this?
Also, the warning:
godot-cpp\bin\libgodot-cpp.windows.debug.64.lib : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
Why am I getting this warning, on a 64 bit machine?