See related issue platformio/platformio-vscode-ide#54

How to reproduce this issue?

1. Please install https://marketplace.visualstudio.com/items?itemName=platformio.platformio-ide
2. PIO Home > New Project > Arduino Due (Programming Port)
3. Open src/main.cpp and paste

#include <Arduino.h>

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH); delay(1000);
  digitalWrite(LED_BUILTIN, LOW); delay(1000);
}

4. 100% CPU, a lot of errors are guaranted.

There were no issues with previous releases. A build of a project works very well, all INCLUDES are provided.