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Backstory

• I'm making a small game engine project for self-learning/ I'm using the Vulkan Graphics API alongside GLFW, which I compile with CMake. Everything works fine during compile-time, but when writing code inside VSCode it gives me false errors saying cannot open source file "GLFW/glfw3.h"C/C++(1696). Even though if I go ahead and compile and include it into the main file it works as intended.

• I have tried restarting VSCode, restarting my computer, rebuilding CMake, and deleting the cache, tried using <> and "" for including, and also using the VSCode suggestion of including it again in the CPP Properties file.

• Important note is that if I include the same code into my main.cpp file it all works fine, but the problem starts happening after I separating the code into separate files and try including GLFW.

File Structure:

+-> .vscode
| |
| +-> c_cpp_properties.json
| +-> settings.json
|
+-> bin
| |
| +-> Abyssal.exe
|
+-> build (CMake build files)
|
+-> src
| |
| +-> AbyssalWindow.h
| +-> main.cpp
|
+-> vendor (nothing inside this folder)
+-> CMakeLists.txt 

{
    "env": {
        "myDefaultIncludePath": [
            "${workspaceFolder}",
            "${workspaceFolder}/src"
        ]
    },
    "configurations": [
        {
            "name": "Windows",
            "intelliSenseMode": "${default}",
            "includePath": [
                "${myDefaultIncludePath}",
                "C:/VulkanSDK/1.2.189.0/Include",
                "C:/glfw-3.3.4/include"
            ],
            "cStandard": "c17",
            "cppStandard": "c++17",
            "configurationProvider": "ms-vscode.cmake-tools"
        }
    ],
    "version": 4
}

#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>

Answers

You say you want to use CMake as your buildsystem. I highly recommend keeping all your build settings in CMake then.

To convert your vscode config use:

set(CMAKE_C_STANDARD 17)
set(CMAKE_CXX_STANDARD 17)

# declare global include directories used by all targets
# by using 'SYSTEM' many compilers will hide internal warnings
include_directories(SYSTEM
  "C:/VulkanSDK/1.2.189.0/Include"
  "C:/glfw-3.3.4/include"
)

Remove the corresponding settings from your vscode config and add your newly created header files to your call to add_executable so vscode gets the include directories right for the file.

Instead of include_directories you could prefer

target_include_directories(YOURTARGET ...)

to be more specific/"modern".