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add very cool linker error (WANT_SAFEGUARD in dietfeatures.h) that makes
ld barf if you try to link an object file compiled with "diet gcc"
against glibc.  The resulting binaries will very likely not work.
This is some funkly linker trickery that I invented here, I'm quite
proud of myself now. ;)

#ifndef _DIETFEATURES_H
#define _DIETFEATURES_H

/* feel free to comment some of these out to reduce code size */

#define WANT_FLOATING_POINT_IN_PRINTF
#define WANT_FLOATING_POINT_IN_SCANF
#define WANT_CHARACTER_CLASSES_IN_SCANF
#define WANT_NULL_PRINTF
#define WANT_LONGLONG_PRINTF

/* 128 or 2048 bytes buffer size? */
/* #define WANT_SMALL_STDIO_BUFS */

/* this is only for meaningful for ttyname so far */
#define SLASH_PROC_OK 1

/* use errno_location instead of errno */
#define WANT_THREAD_SAFE

/* make the startcode, etc. dynamic aware */
/* #undef WANT_DYNAMIC */

/* do you want smaller or faster string routines? */
/* #define WANT_FASTER_STRING_ROUTINES */

/* read the comment in lib/strncat.c for an explanation */
/* #define WANT_NON_COMPLIANT_STRNCAT */

/* strsep, according to the Linux man page, when called on "foo,bar"
 * with separator ",", should return "foo" and then NULL.  glibc,
 * however, returns "foo", then "bar", and then NULL.  The man page
 * behaviour breaks openssh, so you might want to have glibc behaviour. */
#define WANT_BUGGY_GLIBC_STRSEP

#define WANT_LINKER_WARNINGS

/* you need to define this if you want to run your programs with large
 * file support on kernel 2.2 or 2.0 */
#define WANT_LARGEFILE_BACKCOMPAT

/* do you want localtime(3) to read /etc/localtime?
 * Needed for daylight saving time etc. */
#define WANT_TZFILE_PARSER

/* do you want the DNS routines to parse and use "domain" and "search"
 * lines from /etc/resolv.conf?  Normally not used on boot floppies and
 * embedded environments. */
#define WANT_FULL_RESOLV_CONF

/* do you want gethostbyname and friends to consult /etc/hosts? */
#define WANT_ETC_HOSTS

/* do you want math functions high precision rather than fast/small? */
#define WANT_HIGH_PRECISION_MATH

/* do you want support for matherr? */
#define WANT_MATHERR

/* do you want crypt(3) to use MD5 if the salt starts with "$1$"? */
#define WANT_CRYPT_MD5

/* do you want diet to include a safeguard dependency to make linking
 * against glibc fail? */
#define WANT_SAFEGUARD

/* stop uncommenting here ;-) */
#ifndef WANT_FASTER_STRING_ROUTINES
#define WANT_SMALL_STRING_ROUTINES
#endif

#ifdef WANT_THREAD_SAFE
#define errno (*__errno_location())
#define _REENTRANT
#endif

#endif