Intelliscence unexpectingly expanding a macro in c++.

[andrewjavao]

Something strange is happening about the hint given by vscode on cpp macros when I'm working with a cpp project using VSCode:

I have a utility macro for broadcast a given macro to all arguments:

#define NUM_ARGS_IMPL( \
         _1, _2, _3, _4, _5, _6, _7, _8, _9, \
//... many placeholders
    _90,_91,_92,_93,_94,_95,_96,_97,_98,_99, \
    N, ...) N
#define NUM_ARGS_EXPAND(tuple) NUM_ARGS_IMPL tuple
#define NUM_ARGS(...) NUM_ARGS_EXPAND((__VA_ARGS__, \
    99,98,97,96,95,94,93,92,91,90, \
//... many numbers
    9,8,7,6,5,4,3,2,1,0 \
))

#define INVOKE_MACRO(macro_name, ...) macro_name(__VA_ARGS__)

#define BROADCAST_1(macro_name, first     ) INVOKE_MACRO(macro_name, first)
#define BROADCAST_2(macro_name, first, ...) INVOKE_MACRO(macro_name, first) BROADCAST_1(macro_name, __VA_ARGS__)
#define BROADCAST_3(macro_name, first, ...) INVOKE_MACRO(macro_name, first) BROADCAST_2(macro_name, __VA_ARGS__)
//... go through 1 to 99
#define BROADCAST_99(macro_name, first, ...) INVOKE_MACRO(macro_name, first) BROADCAST_98(macro_name, __VA_ARGS__)

#define BROADCAST_EXPAND(macro_name, N, ...) BROADCAST_ ## N(macro_name, __VA_ARGS__)
#define BROADCAST_N(macro_name, N, ...) BROADCAST_EXPAND(macro_name, N, __VA_ARGS__)
/** uitl macro for broadcasting here */
#define BROADCAST(macro_with_one_param, ...) BROADCAST_N(macro_with_one_param, NUM_ARGS(__VA_ARGS__), __VA_ARGS__)

/** using broadcasting */
#define STR_OSTREAM(msg) <<(msg)
#define STR_OSTREAMs(...) BROADCAST(STR_OSTREAM, __VA_ARGS__)  // broadcast STR_OSTREAM on all arguments
#define SSTR(var, ...) \
    std::string var; \
    { \
        std::stringstream ss; \
        ss STR_OSTREAMs(__VA_ARGS__); \
        var = ss.str(); \
    }

#endif

When I use above macro:

SSTR(info, 1, 2, 3, 4);   // Mouse over this
std::cout << info;

The hint given by VSCode at the line "SSTR(info, 1, 2, 3, 4)" is:

which is not correct code, Then I delete configurationProvider in settings.json:

    "C_Cpp.errorSquiggles": "enabled",
    // "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools", // this line is deleted
    "C_Cpp.default.compilerPath": "C:\\mingw64\\bin\\g++.exe",
    "C_Cpp.default.cppStandard": "c++11",

the hints looks good after rescan:

So my questionis:

• why "ms-vscode.cmake-tools" differs?
  according to document in https://code.visualstudio.com/docs/cpp/configure-intellisense:

  A custom configuration provider is another extension in VS Code that can potentially provide more accurate C++ IntelliSense configuration than the C/C++ extension

  does that mean "ms-vscode.cmake-tools" is setting intelliscene in a way that such macro is not supported?

• how to fix this?
  Im not sure if such macro is not compatible enough or it's just a matter of settings.

Sorry for the verboseness, and thank you for any suggestion.