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  1. /* For GLSL in OpenGL ES, an undefined macro appearing in an #if or #elif
  2.  * expression, (other than as an argument to defined) is an error.
  3.  *
  4.  * Except in the case of a short-circuiting && or || operator, where the
  5.  * specification explicitly mandates that there be no error.
  6.  */
  7. #version 300 es
  8.  
  9. /* These yield errors */
  10. #if NOT_DEFINED
  11. #endif
  12.  
  13. #if 0
  14. #elif ALSO_NOT_DEFINED
  15. #endif
  16.  
  17. /* But these yield no errors */
  18. #if 1 || STILL_NOT_DEFINED
  19. Success
  20. #endif
  21.  
  22. #if 0
  23. #elif 0 && WILL_ANYONE_DEFINE_ANYTHING
  24. #else
  25. More success
  26. #endif
  27.  
  28.