Locate source files - c

Question

I have C++ application in Visual Studio Code that uses function that is located in my shared library. I place shared library code in source directory and I can debug through it. I would like to place library source in other folder. But how to tell VS Code where this source is located.
Content of tasks.json
tasks": [
{
"type": "cppbuild",
"label": "linklib",
"command": "/usr/bin/gcc",
"args": [
"-g",
"${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}",
"-L", ".",
"-lmylib"
],
"options": {
"cwd": "${workspaceFolder}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "compiler: /usr/bin/gcc"
}
]
Content of launch.json
{
"version": "0.2.0",
"configurations": [
{
"name": "(gdb) Launch",
"type": "cppdbg",
"request": "launch",
"program": "${fileDirname}/${fileBasenameNoExtension}",
"args": [],
"stopAtEntry": false,
"cwd": "${fileDirname}",
"environment": [],
"externalConsole": false,
"MIMode": "gdb",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
},
{
"description": "Set Disassembly Flavor to Intel",
"text": "-gdb-set disassembly-flavor intel",
"ignoreFailures": true
}
],
"preLaunchTask": "linklib"
//"preLaunchTask": "C/C++: build"
}
]
}