In case Apache Ant ever gives you such error:

An unexpected exception has been detected in native code outside the VM.

Unexpected Signal : 11 occurred at PC=0xD

Function=[Unknown.]

Library=(N/A)



NOTE: We are unable to locate the function name symbol for the error

      just occurred. Please refer to release documentation for possible

      reason and solutions.

Add

<sleep milliseconds="1"/>

right before the javac call in build file and it works like a charm.

P.S. It's definetly one of the trickiest things i have ever seen while working with Java.