Function returning array is not allowed in Linux kernel

Question

After cloning the Linux kernel and opening up for example /drivers/md/dm-zero.c in VSCode (with the C CPP extension) gives me an error at the last 3 lines saying: function returning array is not allowed.

Of course I know that this should not be an error since I just cloned and didn't adjust anything. Is there a setting in the C CPP extension that should be set?

Thanks!

Edit: The title is misleading: I know this has nothing to do with the kernel itself, but I wanted to specify that VSCode complains about something that was already written in the Linux Kernel source code

Edit2: The specific error is in these 3 lines: function returning array is not allowed C/C++(91)

MODULE_AUTHOR("Jana Saout <[email protected]>");
MODULE_DESCRIPTION(DM_NAME " dummy target returning zeros");
MODULE_LICENSE("GPL");

MODULE_AUTHOR for example expands to

#define __MODULE_INFO(tag, name, info)                    \
    static const char __UNIQUE_ID(name)[]                 \
        __used __section(".modinfo") __aligned(1)         \
        = __MODULE_INFO_PREFIX __stringify(tag) "=" info

I use GCC in Ubuntu 20.04

Answer 1

This comment in the vscode github repo solved the issue for me. Basically need to add some explicit include paths and compiler args to the c_cpp_properties.json file.

"includePath": [
  "/usr/src/linux-headers-5.4.0-39-generic/arch/x86/include",
  "/usr/src/linux-headers-5.4.0-39-generic/arch/x86/include/generated",
  "/usr/src/linux-headers-5.4.0-39-generic/include",
  "/usr/src/linux-headers-5.4.0-39-generic/arch/x86/include/uapi",
  "/usr/src/linux-headers-5.4.0-39-generic/arch/x86/include/generated/uapi",
  "/usr/src/linux-headers-5.4.0-39-generic/include/uapi",
  "/usr/src/linux-headers-5.4.0-39-generic/include/generated/uapi",
  "/usr/src/linux-headers-5.4.0-39-generic/ubuntu/include",
  "/usr/lib/gcc/x86_64-linux-gnu/9/include"
],
"compilerArgs": [
  "-nostdinc",
  "-include", "/usr/src/linux-headers-5.4.0-39-generic/include/linux/kconfig.h",
  "-include", "/usr/src/linux-headers-5.4.0-39-generic/include/linux/compiler_types.h"
]