"pio run -t clean" not working if "envs_dir" is set in platformio.ini

[rwalli]

• [X ] Bug report. If you’ve found a bug, please provide information below.

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Configuration

Operating system: macOS 10.11.6

PlatformIO Version (platformio --version): PlatformIO, version 3.0.0a4

Description of problem

After running "pio run" and "pio run -t clean" none of the object or firmware files are removed

Steps to Reproduce

1. load arduino-blink example
2. set e.g: envs_dir = /tmp/pio/blink in platformio.ini
3. run "pio run" and "pio run -t clean"

Actual Results

find /tmp/pio/blink/uno/ -type f
/tmp/pio/blink/uno//firmware.elf
/tmp/pio/blink/uno//firmware.hex
/tmp/pio/blink/uno//FrameworkArduino/_wiring_pulse.o
/tmp/pio/blink/uno//FrameworkArduino/abi.o
/tmp/pio/blink/uno//FrameworkArduino/CDC.o
/tmp/pio/blink/uno//FrameworkArduino/HardwareSerial.o
/tmp/pio/blink/uno//FrameworkArduino/HardwareSerial0.o
/tmp/pio/blink/uno//FrameworkArduino/HardwareSerial1.o
/tmp/pio/blink/uno//FrameworkArduino/HardwareSerial2.o
/tmp/pio/blink/uno//FrameworkArduino/HardwareSerial3.o
/tmp/pio/blink/uno//FrameworkArduino/hooks.o
/tmp/pio/blink/uno//FrameworkArduino/IPAddress.o
/tmp/pio/blink/uno//FrameworkArduino/main.o
/tmp/pio/blink/uno//FrameworkArduino/new.o
/tmp/pio/blink/uno//FrameworkArduino/PluggableUSB.o
/tmp/pio/blink/uno//FrameworkArduino/Print.o
/tmp/pio/blink/uno//FrameworkArduino/Stream.o
/tmp/pio/blink/uno//FrameworkArduino/Tone.o
/tmp/pio/blink/uno//FrameworkArduino/USBCore.o
/tmp/pio/blink/uno//FrameworkArduino/WInterrupts.o
/tmp/pio/blink/uno//FrameworkArduino/wiring.o
/tmp/pio/blink/uno//FrameworkArduino/wiring_analog.o
/tmp/pio/blink/uno//FrameworkArduino/wiring_digital.o
/tmp/pio/blink/uno//FrameworkArduino/wiring_pulse.o
/tmp/pio/blink/uno//FrameworkArduino/wiring_shift.o
/tmp/pio/blink/uno//FrameworkArduino/WMath.o
/tmp/pio/blink/uno//FrameworkArduino/WString.o
/tmp/pio/blink/uno//libFrameworkArduino.a
/tmp/pio/blink/uno//libFrameworkArduinoVariant.a
/tmp/pio/blink/uno//src/Blink.o

Expected Results

delete compiled object files, libraries and firmware/program binaries

If problems with PlatformIO Build System:

The content of platformio.ini:

[platformio]
envs_dir = /tmp/pio/blink

[env:uno]
platform = atmelavr
framework = arduino
board = uno

Source file to reproduce issue:

#include <Arduino.h>

void setup()
{
  // initialize LED digital pin as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop()
{
  // turn the LED on (HIGH is the voltage level)
  digitalWrite(LED_BUILTIN, HIGH);
  // wait for a second
  delay(1000);
  // turn the LED off by making the voltage LOW
  digitalWrite(LED_BUILTIN, LOW);
   // wait for a second
  delay(1000);
}

Additional info