how to ignore include path for /usr/include/linux

[yzr95924]

Hi all,

I am working on developing liunx kernel in vscode. When I include "<linux/module.h>" in the source file, IntellisSense will jump to "/usr/include/linux/module.h" instead of "/usr/src/$(uname -r)/include/linux/module.h". Can anyone provide some hints to address this problem? Thanks.

[yzr95924]

I also try to add "/usr/src/$(uname -r)/include" in includePath field in c_cpp_properties.json，but it does not help.

[bobbrow]

Can you share your c_cpp_properties.json? IncludePaths should be searched in order from first to last.

Another option to try is using the Makefile Tools extension which can manage your configurations for you.

[yzr95924]

Sure, actually I find this issue might be caused by the order of entries in includePath:

Originally, I configure the c_cpp_properties.json as follows:

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**",
                "/usr/src/linux-headers-5.15.90.1-microsoft-standard-WSL2/arch/x86/include/generated",
                "/usr/src/linux-headers-5.15.90.1-microsoft-standard-WSL2/arch/x86/include",
                "/usr/src/linux-headers-5.15.90.1-microsoft-standard-WSL2/include"
            ],
            "defines": [
                "__GNUC__",
                "__KERNEL__=1",
                "MODULE=1"
            ],
            "compilerPath": "/usr/bin/clang",
            "intelliSenseMode": "linux-clang-x64",
            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
            "cStandard": "c17",
            "cppStandard": "c++17"
        }
    ],
    "version": 4
}

it does not work. then I change to the one as follows:

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "/usr/src/linux-headers-5.15.90.1-microsoft-standard-WSL2/arch/x86/include/generated",
                "/usr/src/linux-headers-5.15.90.1-microsoft-standard-WSL2/arch/x86/include",
                "/usr/src/linux-headers-5.15.90.1-microsoft-standard-WSL2/include",
                "${workspaceFolder}/**"
            ],
            "defines": [
                "__GNUC__",
                "__KERNEL__=1",
                "MODULE=1"
            ],
            "compilerPath": "/usr/bin/clang",
            "intelliSenseMode": "linux-clang-x64",
            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
            "cStandard": "c17",
            "cppStandard": "c++17"
        }
    ],
    "version": 4
}

it works.

[bobbrow]

I'm a bit surprised since I thought the path that was interfering was /usr/include which comes from your compiler's system include path that is added after the includePath you've specified. I'm wondering if your local version of <linux/module.h> has an #include_next in it?

The observation you've made above is correct though. If you want a certain path to take precedence over the recursive search in your workspace folder (${workspaceFolder}/**), you add it at the beginning of the includePath.

[michelleangela]

@yzr95924
The extension has these files exclude settings that you could use to exclude folders/files.

[yzr95924]

thanks, I will try this