title: Error: L6218E: Undefined symbol main (referred from __rtentry2.o)
body: <p>anyone can help me?? my board is LPC1768 and the sensor is BMP180</p>
  
  <pre><code>Rebuild target 'Target 1'
  compiling BMP180.c...
  compiling I2C.c...
  assembling startup_LPC17xx.s...
  compiling system_LPC17xx.c...
  compiling GPIO_LPC17xx.c...
  compiling PIN_LPC17xx.c...
  linking...
  .\Objects\asdsa.axf: Error: L6218E: Undefined symbol main (referred from __rtentry2.o).
  Not enough information to list image symbols.
  Finished: 1 information, 0 warning and 1 error messages.
  ".\Objects\asdsa.axf" - 1 Error(s), 0 Warning(s).
  Target not created.
  </code></pre>