tasks.json

{
    "version": "0.1.0",
    "windows": {
        "command": "C:\\FPC\\3.0.0\\bin\\i386-win32\\fpc.exe"
    },
    "isShellCommand": true,
    "showOutput": "always",
    "args": [
        "Demo"
    ],
    "problemMatcher": {
        "owner": "external",
        "pattern": {
            "regexp": "^([\\w]+\\.p)\\((\\d+)\\,(\\d+)\\)\\s(Fatal|Error|Warning|Note):(.*)",
            "file": 1,
            "line": 2,
            "column": 3,
            "message": 5
        }
    }
}