text: /*
   * This should never be included directly.  It is included only from gc.h.
   * We separate it only to make gc.h more suitable as documentation.
   * 
   * Some tests for old macros.  These violate our namespace rules and will
   * disappear shortly.  Use the GC_ names.
   */
  #if defined(SOLARIS_THREADS) || defined(_SOLARIS_THREADS) \
      || defined(_SOLARIS_PTHREADS) || defined(GC_SOLARIS_PTHREADS)
    /* We no longer support old style Solaris threads.		*/
    /* GC_SOLARIS_THREADS now means pthreads.			*/
  # ifndef GC_SOLARIS_THREADS
  #   define GC_SOLARIS_THREADS
  # endif
  #endif
  #if defined(IRIX_THREADS)
  # define GC_IRIX_THREADS
  #endif
  #if defined(DGUX_THREADS)
  # if !defined(GC_DGUX386_THREADS)
  #  define GC_DGUX386_THREADS
  # endif
  #endif
  #if defined(AIX_THREADS)
  # define GC_AIX_THREADS
  #endif
  #if defined(HPUX_THREADS)
  # define GC_HPUX_THREADS
  #endif
  #if defined(OSF1_THREADS)
  # define GC_OSF1_THREADS
  #endif
  #if defined(LINUX_THREADS)
  # define GC_LINUX_THREADS
  #endif
  #if defined(WIN32_THREADS)
  # define GC_WIN32_THREADS
  #endif
  #if defined(USE_LD_WRAP)
  # define GC_USE_LD_WRAP
  #endif
  
  #if !defined(_REENTRANT) && (defined(GC_SOLARIS_THREADS) \
  			     || defined(GC_HPUX_THREADS) \
  			     || defined(GC_AIX_THREADS) \
  			     || defined(GC_LINUX_THREADS) \
  			     || defined(GC_NETBSD_THREADS) \
  			     || defined(GC_GNU_THREADS))
  # define _REENTRANT
  	/* Better late than never.  This fails if system headers that	*/
  	/* depend on this were previously included.			*/
  #endif
  
  #if !defined(_PTHREADS) && defined(GC_NETBSD_THREADS)
  # define _PTHREADS
  #endif
  
  #if defined(GC_DGUX386_THREADS) && !defined(_POSIX4A_DRAFT10_SOURCE)
  # define _POSIX4A_DRAFT10_SOURCE 1
  #endif
  
  # if defined(GC_SOLARIS_THREADS) || defined(GC_FREEBSD_THREADS) || \
  	defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) || \
  	defined(GC_HPUX_THREADS) || defined(GC_OSF1_THREADS) || \
  	defined(GC_DGUX386_THREADS) || defined(GC_DARWIN_THREADS) || \
          defined(GC_AIX_THREADS) || defined(GC_NETBSD_THREADS) || \
          (defined(GC_WIN32_THREADS) && defined(__CYGWIN32__)) || \
  	defined(GC_GNU_THREADS)
  #   define GC_PTHREADS
  # endif
  
  #if defined(GC_WIN32_PTHREADS)
  #   define GC_WIN32_THREADS
  #   define GC_PTHREADS
  #endif
  
  #if defined(GC_THREADS) && !defined(GC_PTHREADS)
  # if defined(__linux__)
  #   define GC_LINUX_THREADS
  #   define GC_PTHREADS
  # endif
  # if !defined(__linux__) && (defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
                           || defined(hppa) || defined(__HPPA)) \
  			 || (defined(__ia64) && defined(_HPUX_SOURCE))
  #   define GC_HPUX_THREADS
  #   define GC_PTHREADS
  # endif
  # if !defined(__linux__) && (defined(__alpha) || defined(__alpha__))
  #   define GC_OSF1_THREADS
  #   define GC_PTHREADS
  # endif
  # if defined(__mips) && !defined(__linux__)
  #   define GC_IRIX_THREADS
  #   define GC_PTHREADS
  # endif
  # if defined(__sparc) && !defined(__linux__) \
       || defined(sun) && (defined(i386) || defined(__i386__))
  #   define GC_SOLARIS_THREADS
  #   define GC_PTHREADS
  # endif
  # if defined(__APPLE__) && defined(__MACH__)
  #   define GC_DARWIN_THREADS
  #   define GC_PTHREADS
  # endif
  # if !defined(GC_PTHREADS) && (defined(__FreeBSD__) || defined(__DragonFly__))
  #   define GC_FREEBSD_THREADS
  #   define GC_PTHREADS
  # endif
  # if !defined(GC_PTHREADS) && defined(__NetBSD__)
  #   define GC_NETBSD_THREADS
  #   define GC_PTHREADS
  # endif
  # if defined(DGUX) && (defined(i386) || defined(__i386__))
  #   define GC_DGUX386_THREADS
  #   define GC_PTHREADS
  # endif
  # if defined(_AIX)
  #   define GC_AIX_THREADS
  #   define GC_PTHREADS
  # endif
  #endif /* GC_THREADS */
  
  #if defined(GC_THREADS) && !defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS) \
      && (defined(_WIN32) || defined(_MSC_VER) || defined(__CYGWIN__) \
       || defined(__MINGW32__) || defined(__BORLANDC__) \
       || defined(_WIN32_WCE))
  # define GC_WIN32_THREADS
  # if defined(__CYGWIN__)
  #   define GC_PTHREADS
  # endif
  #endif
  
  # define __GC
  # ifndef _WIN32_WCE
  #   include <stddef.h>
  #   if defined(__MINGW32__)
  #     include <stdint.h>
        /* We mention uintptr_t.					    */
        /* Perhaps this should be included in pure msft environments  */
        /* as well?						    */
  #   endif
  # else /* ! _WIN32_WCE */
  /* Yet more kluges for WinCE */
  #   include <stdlib.h>		/* size_t is defined here */
      typedef long ptrdiff_t;	/* ptrdiff_t is not defined */
  # endif
  
  #if defined(_DLL) && !defined(GC_NOT_DLL) && !defined(GC_DLL)
  # define GC_DLL
  #endif
  
  #if defined(__MINGW32__) && defined(GC_DLL)
  # ifdef GC_BUILD
  #   define GC_API __declspec(dllexport)
  # else
  #   define GC_API __declspec(dllimport)
  # endif
  #endif
  
  #if (defined(__DMC__) || defined(_MSC_VER)) && defined(GC_DLL)
  # ifdef GC_BUILD
  #   define GC_API extern __declspec(dllexport)
  # else
  #   define GC_API __declspec(dllimport)
  # endif
  #endif
  
  #if defined(__WATCOMC__) && defined(GC_DLL)
  # ifdef GC_BUILD
  #   define GC_API extern __declspec(dllexport)
  # else
  #   define GC_API extern __declspec(dllimport)
  # endif
  #endif
  
  #ifndef GC_API
  #define GC_API extern
  #endif
  
  