platformio.ini

; [env:teensy31]
; platform = teensy
; framework = arduino
; board = teensy31

;[env:promini]
;platform = atmelavr
;framework = arduino
;board = pro16MHzatmega328	

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

; [env:mega]
; platform = atmelavr
; framework = arduino
; board = megaatmega2560

;[env:nodemcuv2]
;platform = espressif8266
;framework = arduino
;board = nodemcuv2

;[env:nano]
;platform = atmelavr
;framework = arduino
;board = nanoatmega328

upload_port = /dev/ttyACM0
# targets = upload
#

i have error while i use this for my Arduino Uno
ERROR

Linking .pioenvs/uno/firmware.elf
/tmp/ccSIwwZk.ltrans0.ltrans.o: In function main': ccSIwwZk.ltrans0.o:(.text.startup+0x86): undefined reference to setup'
ccSIwwZk.ltrans0.o:(.text.startup+0x8e): undefined reference to `loop'
collect2: error: ld returned 1 exit status
*** [.pioenvs/uno/firmware.elf] Error 1

And while installing platformio
i get this error
lagan@ROBOT:~/ros_catkin_ws/src$ sudo pip install -U platformio

The directory '/home/lagan/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/lagan/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.