intelliSense show incorrect sizeof

[NTLPY]

Environment

• OS and Version: Windows 11
• VS Code Version: 1.98.2
• C/C++ Extension Version: v1.23.6
• If using SSH remote, specify OS of remote machine: NO

Bug Summary and Steps to Reproduce

Bug Summary:
Incorrect output of sizeof

Env:

1. g++.exe (x86_64-win32-seh-rev0, Built by MinGW-Builds project) 14.2.0

Steps to reproduce:

1. Create file tmp.cpp:

#include <iostream>

using namespace std;

struct foo
{
    int a;
    __uint128_t b;
};

int
main()
{
    cout << sizeof(foo) << endl;
    return 0;
}

2. Move cursor to sizeof(foo), which says (unsigned long long)24ULL
3. g++ -o tmp.exe tmp.cpp && ./tmp.exe

Output: 32

Configuration and Logs

c_cpp_properties.json:

{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "compilerPath": "${default}",
            "cStandard": "c17",
            "cppStandard": "gnu++17",
            "intelliSenseMode": "windows-gcc-x64"
        }
    ],
    "version": 4
}

Diag:
-------- Diagnostics - 3/14/2025, 9:12:10 PM
Version: 1.23.6
Current Configuration:
{
    "name": "Win32",
    "includePath": [
        "@@@/**"
    ],
    "defines": [
        "_DEBUG",
        "UNICODE",
        "_UNICODE"
    ],
    "compilerPath": "@@@\\mingw64\\bin\\gcc.exe",
    "cStandard": "c17",
    "cppStandard": "gnu++17",
    "intelliSenseMode": "windows-gcc-x64",
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "compilerPathInCppPropertiesJson": "${default}",
    "macFrameworkPath": [],
    "mergeConfigurations": false,
    "browse": {
        "path": [
            "@@@/**",
            "${workspaceFolder}"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.autoAddFileAssociations": false
}
Additional Tracked Settings:
{
    "editorTabSize": 4,
    "editorInsertSpaces": true,
    "editorAutoClosingBrackets": "languageDefined",
    "filesEncoding": "utf8",
    "filesAssociations": {
        "*.embeddedhtml": "html",
        ".clang-format": "yaml",
        ".clang-tidy": "yaml",
        "*.drawio": "xml",
        "py": "shellscript"
    },
    "filesExclude": {
        "**/.git": true,
        "**/.svn": true,
        "**/.hg": true,
        "**/.DS_Store": true,
        "**/Thumbs.db": true
    },
    "filesAutoSaveAfterDelay": false,
    "editorInlayHintsEnabled": true,
    "editorParameterHintsEnabled": true,
    "searchExclude": {
        "**/node_modules": true,
        "**/bower_components": true,
        "**/*.code-search": true
    },
    "workbenchSettingsEditor": "ui"
}
cpptools version (native): 1.23.6.0
Current database path: @@@\APPDATA\LOCAL\MICROSOFT\VSCODE-CPPTOOLS\8C1C22839CFEA9FBF4F53587E43CC58C\.BROWSE.VC.DB
No active translation units.

Other Extensions

No response

Additional context

No response