title: cross compile (arm-none-eabi-as) arm assembly error "junk at end of line /" or undefined symbol
body: <p>Hi while i cross compile an startup.s file
  (arm-none-eabi-as file.s)
  (*-gcc)</p>
  
  <p>I am getting in each commentary line some errors
  - junk at end of line, first unrecognized character is <code>/</code></p>
  
  <p>when i delete the // some comment lines i get
  errors about undefined symbols even i defined them at beginning of the file.</p>
  
  <p>anyone know whats wrong?</p>