includePath doesn't work but when I forceInclude all intelsense error are gone

[0xMALVEE]

Environment

• OS and Version: Fedora 41
• VS Code Version: c++
• C/C++ Extension Version: latest
• If using SSH remote, specify OS of remote machine:

Bug Summary and Steps to Reproduce

Bug Summary:

this is the error

    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/bpf/**",
                "${workspaceFolder}/bpf/include"
            ],
            "forcedInclude": [
                // "${workspaceFolder}/bpf/include/type_mapper.h"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c17",
            "cppStandard": "c++98",
            "intelliSenseMode": "linux-gcc-x64"
        }
    ],
    "version": 4
}

the errors goes away only if I use forceInclude

  "forcedInclude": [
                "${workspaceFolder}/bpf/include/type_mapper.h"
            ],

why I have to forceInclude there is a lot of projects & a lot of files it's not possible to force include each and every file.
Steps to reproduce:

install fedora 41 vs code & c++ extension
repo: https://github.com/cilium/tetragon

Expected behavior:
there should be 0 intelsense errors

Configuration and Logs

c_cpp_properties.json


{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/bpf/**",
                "${workspaceFolder}/bpf/include"
            ],
            "forcedInclude": [
                // "${workspaceFolder}/bpf/include/type_mapper.h"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c17",
            "cppStandard": "c++98",
            "intelliSenseMode": "linux-gcc-x64"
        }
    ],
    "version": 4
}



C/C++: Log Diagonstics
-------- Diagnostics - 4/2/2025, 1:49:50 AM
Version: 1.23.6
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "/home/malvee/code/tetragon/bpf/**",
        "/home/malvee/code/tetragon/bpf/include"
    ],
    "forcedInclude": [],
    "defines": [],
    "compilerPath": "/usr/bin/gcc",
    "cStandard": "c17",
    "cppStandard": "c++98",
    "intelliSenseMode": "linux-gcc-x64",
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "compilerPathInCppPropertiesJson": "/usr/bin/gcc",
    "mergeConfigurations": false,
    "browse": {
        "path": [
            "/home/malvee/code/tetragon/bpf/**",
            "/home/malvee/code/tetragon/bpf/include",
            "${workspaceFolder}"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.errorSquiggles": "enabled",
    "C_Cpp.default.compilerPath": "/usr/bin/gcc"
}
Additional Tracked Settings:
{
    "editorTabSize": 2,
    "editorInsertSpaces": true,
    "editorAutoClosingBrackets": "languageDefined",
    "filesEncoding": "utf8",
    "filesAssociations": {
        "*.css": "tailwindcss"
    },
    "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: /home/malvee/.cache/vscode-cpptools/584948c031d850a2bd45203b3ed0aa43/.browse.VC.db
Translation Unit Mappings:
[ /home/malvee/code/tetragon/bpf/process/bpf_enforcer.c - source TU]:
    /home/malvee/code/tetragon/bpf/process/bpf_enforcer.h
Translation Unit Configurations:
[ /home/malvee/code/tetragon/bpf/process/bpf_enforcer.c ]
    Process ID: 83170
    Memory Usage: 18 MB
    Compiler Path: /usr/bin/gcc
    Includes:
        /home/malvee/code/tetragon/bpf/include
        /home/malvee/code/tetragon/bpf/lib
        /home/malvee/code/tetragon/bpf/libbpf
    System Includes:
        /usr/lib/gcc/x86_64-redhat-linux/14/include
        /usr/local/include
        /usr/include
    Standard Version: c17
    IntelliSense Mode: linux-gcc-x64
    Other Flags:
        --gcc
        --gnu_version=140201
Total Memory Usage: 18 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 24382

Other Extensions

No response

Additional context

No response

[0xMALVEE]

@sean-mcmanus

[sean-mcmanus]

@0xMALVEE It doesn't repro for me. I'm not sure what could be causing the issue. The symptom can happen if the forced include cannot be found. We fixed a couple forced include bugs with 1.24.x, but it doesn't seem like you would be hitting one of those. You could set C_Cpp.loggingLevel to "Debug" and check the "C/C++" logging for any errors, but I'm not sure if you would see anything useful.

For some unknown reason, the forced include is not being used by the IntelliSense configuration.

[sean-mcmanus]

@0xMALVEE Your C/C++: Log Diagnostics logging has the forced include commented out -- can you provide the logging with it not commented out?

[sean-mcmanus]

@0xMALVEE Okay, sorry, I misunderstood your post. It seems there is some problem without the forced include...

[bobbrow]

As far as I can tell, type_mapper.h isn't included by any other file in that repo, so forced include is required for it. You shouldn't need to force include everything, but unless you have a #include <type_mapper.h> somewhere in the code, IntelliSense isn't going to automatically know you want to use it.

[githubxone]

I also have a similar problem when using WSL: