libc/newlib/libc/include/sys/config.h

#ifndef __SYS_CONFIG_H__
#define __SYS_CONFIG_H__

#include <machine/ieeefp.h>  /* floating point macros */

/* exceptions first */
#if defined(__H8300__) || defined(__H8500__) || defined (__H8300H__) ||  defined(__W65__) || defined (__H8300S__)
/* ???  This conditional is true for the h8500 and the w65, defining H8300
   in those cases probably isn't the right thing to do.  */
#define __SMALL_BITFIELDS
#define H8300 1
#endif

/* 16 bit integer machines */
#if defined(__Z8001__) || defined(__Z8002__) || defined(__H8300__) || defined(__H8500__) || defined(__W65__) || defined (__H8300H__) || defined (__H8300S__) || defined (__mn10200__) || defined (__AVR__)

#undef INT_MAX
#undef UINT_MAX
#define INT_MAX 32767
#define UINT_MAX 65535
#endif

#ifdef __W65__
#define __SMALL_BITFIELDS
#endif

#if defined(__D10V__)
#define __SMALL_BITFIELDS
#undef INT_MAX
#undef UINT_MAX
#define INT_MAX __INT_MAX__
#define UINT_MAX (__INT_MAX__ * 2U + 1)
#define _POINTER_INT short
#endif

#ifdef ___AM29K__
#define _FLOAT_RET double
#endif

#ifdef __i386__
#ifndef __unix__
/* in other words, go32 */
#define _FLOAT_RET double
#endif
#ifdef __linux__
/* we want the reentrancy structure to be returned by a function */
#define __DYNAMIC_REENT__
#define HAVE_GETDATE
#define _HAVE_SYSTYPES
#define _READ_WRITE_RETURN_TYPE _ssize_t
#endif
#endif

#ifdef __mn10200__
#define __SMALL_BITFIELDS
#endif

#ifdef __AVR__
#define __SMALL_BITFIELDS
#define _POINTER_INT short
#endif

#ifdef __v850
#define __ATTRIBUTE_IMPURE_PTR__ __attribute__((__sda__))
#endif

/* For the PowerPC eabi, force the _impure_ptr to be in .sdata */
#if defined(__PPC__)
#if defined(_CALL_SYSV)
#define __ATTRIBUTE_IMPURE_PTR__ __attribute__((__section__(".sdata")))
#endif
#endif

#ifdef __xstormy16__
#define __SMALL_BITFIELDS
#undef INT_MAX
#undef UINT_MAX
#define INT_MAX __INT_MAX__
#define UINT_MAX (__INT_MAX__ * 2U + 1)
#define SIZE_T_SMALLER_THAN_LONG
#define MALLOC_ALIGNMENT 8
#define _POINTER_INT short
#define __BUFSIZ__ 16
#define _REENT_SMALL
#endif

/* This block should be kept in sync with GCC's limits.h.  The point
   of having these definitions here is to not include limits.h, which
   would pollute the user namespace, while still using types of the
   the correct widths when deciding how to define __int32_t and
   __int64_t.  */
#ifndef __INT_MAX__
# ifdef INT_MAX
#  define __INT_MAX__ INT_MAX
# else
#  define __INT_MAX__ 2147483647
# endif
#endif

#ifndef __LONG_MAX__
# ifdef LONG_MAX
#  define __LONG_MAX__ LONG_MAX
# else
#  if defined (__alpha__) || (defined (__sparc__) && defined(__arch64__)) \
      || defined (__sparcv9)
#   define __LONG_MAX__ 9223372036854775807L
#  else
#   define __LONG_MAX__ 2147483647L
#  endif /* __alpha__ || sparc64 */
# endif
#endif
/* End of block that should be kept in sync with GCC's limits.h.  */

#ifndef _POINTER_INT
#define _POINTER_INT long
#endif

#ifdef __frv__
#define __ATTRIBUTE_IMPURE_PTR__ __attribute__((__section__(".sdata")))
#endif
#undef __RAND_MAX
#if __INT_MAX__ == 32767
#define __RAND_MAX 32767
#else
#define __RAND_MAX 0x7fffffff
#endif


#if defined(__CYGWIN32__) || defined(__CYGWIN__)
#define __FILENAME_MAX__ (260 - 1 /* NUL */)
#define _READ_WRITE_RETURN_TYPE _ssize_t
#if defined(__INSIDE_CYGWIN__) || defined(_COMPILING_NEWLIB)
#define __IMPORT
#else
#define __IMPORT __declspec(dllimport)
#endif
#endif

#if defined(__rtems__)
#define __FILENAME_MAX__ 255
#define _READ_WRITE_RETURN_TYPE _ssize_t
#endif

#ifndef __IMPORT
#define __IMPORT
#endif

/* Define return type of read/write routines.  In POSIX, the return type
   for read()/write() is "ssize_t" but legacy newlib code has been using
   "int" for some time.  If not specified, "int" is defaulted.  */
#ifndef _READ_WRITE_RETURN_TYPE
#define _READ_WRITE_RETURN_TYPE int
#endif

#endif /* __SYS_CONFIG_H__ */