text: #ifndef Py_STACKLESS_H
  #define Py_STACKLESS_H
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /* this option might go into a global config.
     It says "we want to compile stackless", but it
     is turned off again if our platform doesn't
     implement it.
   */
  
  /****************************************************************************
  
    Stackless Internal Configuration
  
    Some preliminary description can be found in the draft document readme.txt
  
    The configuration is dependant of one #define:
    STACKLESS means that we want to create a stackless version.
    Without STACKLESS set, you will get the standard C-Python(r) application.
    If STACKLESS is set, the necessary fields and initializations are
    expanded, provided that the platform/compiler is supported by special
    header files. They implement the critical assembly part.
    If your platform is configured in this file but not supported,
    you will get a compiler error.
  
   ****************************************************************************/
  
  /*
   * every platform needs to define its own interface here.
   * If this isn't defined, stackless is simply not compiled in.
   * Repeat the following sequence for every platform you support...
   * ...and then write your support code and mention it in the
   * common slp_platformselect.h file.
   */
  #define STACKLESS
  
  #ifdef STACKLESS_OFF
  #undef STACKLESS
      /* an option to switch it off */
  #elif defined(MS_WIN32) && !defined(MS_WIN64) && defined(_M_IX86)
      /* MS Visual Studio on X86 */
  #elif defined(_WIN64) && defined(_M_X64)
      /* microsoft on 64 bit x64 thingies */
  #elif defined(__GNUC__) && defined(__i386__)
      /* gcc on X86 */
  #elif defined(__GNUC__) && defined(__amd64__)
      /* gcc on AMD64 */
  #elif defined(__GNUC__) && defined(__PPC__) && defined(__linux__)
      /* gcc on PowerPC */
  #elif defined(__GNUC__) && defined(__ppc__) && defined(__APPLE__)
      /* Apple MacOS X on PowerPC */
  #elif defined(__GNUC__) && defined(sparc) && defined(sun)
      /* SunOs on sparc */
  #elif defined(__GNUC__) && defined(__s390__) && defined(__linux__)
      /* Linux/S390 */
  #elif defined(__GNUC__) && defined(__s390x__) && defined(__linux__)
      /* Linux/S390 zSeries */
  #elif defined(__GNUC__) && defined(__mips__) && defined(__linux__)
      /* MIPS */
  #else
      /* no supported platform */
  #undef STACKLESS
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  #endif /* Py_STACKLESS_H */
  