Annotation of dietlibc/dietfeatures.h, revision 1.54
1.4 fefe 1: #ifndef _DIETFEATURES_H
2: #define _DIETFEATURES_H
1.1 cvs 3:
4: /* feel free to comment some of these out to reduce code size */
5:
1.13 fefe 6: #define WANT_FLOATING_POINT_IN_PRINTF
7: #define WANT_FLOATING_POINT_IN_SCANF
1.12 fefe 8: #define WANT_CHARACTER_CLASSES_IN_SCANF
1.1 cvs 9: #define WANT_NULL_PRINTF
1.52 sanjiyan 10: /* #define WANT_ERROR_PRINTF */
1.24 fefe 11: #define WANT_LONGLONG_PRINTF
1.42 olaf 12: #define WANT_LONGLONG_SCANF
1.1 cvs 13:
1.20 fefe 14: /* 128 or 2048 bytes buffer size? */
15: /* #define WANT_SMALL_STDIO_BUFS */
16:
1.40 fefe 17: /* want fread to read() directly if size of data is larger than buffer?
18: * This costs a few bytes but is worth it if the application is already
19: * buffering. */
20: #define WANT_FREAD_OPTIMIZATION
21:
1.34 fefe 22: /* this is only for meaningful for ttyname and sysconf_cpus so far */
1.40 fefe 23: #define SLASH_PROC_OK
1.1 cvs 24:
25: /* use errno_location instead of errno */
1.20 fefe 26: #define WANT_THREAD_SAFE
1.1 cvs 27:
1.35 olaf 28: /* make the startcode, etc. dynamic aware ({con,de}structors) */
1.38 olaf 29: /* #define WANT_DYNAMIC */
1.1 cvs 30:
31: /* do you want smaller or faster string routines? */
1.2 fefe 32: /* #define WANT_FASTER_STRING_ROUTINES */
1.1 cvs 33:
1.43 fefe 34: /* define this to have strncpy zero-fill and not just zero-terminate the
35: * string */
36: /* #define WANT_FULL_POSIX_COMPAT */
37:
1.16 fefe 38: /* read the comment in lib/strncat.c for an explanation */
1.54 ! leitner 39: #define WANT_NON_COMPLIANT_STRNCAT
1.16 fefe 40:
1.47 leitner 41: /* on i386, Linux has an alternate syscall method since 2002/12/16 */
42: /* on my Athlon XP, it is twice as fast, but it's only in kernel 2.5 */
1.53 leitner 43: /* 20040118: enabling this breaks User Mode Linux! It's their fault. */
1.48 leitner 44: #define WANT_SYSENTER
1.47 leitner 45:
1.4 fefe 46: #define WANT_LINKER_WARNINGS
47:
1.7 fefe 48: /* you need to define this if you want to run your programs with large
1.31 fefe 49: * file support on kernel 2.2 or 2.0 */
1.7 fefe 50: #define WANT_LARGEFILE_BACKCOMPAT
51:
1.8 fefe 52: /* do you want localtime(3) to read /etc/localtime?
53: * Needed for daylight saving time etc. */
54: #define WANT_TZFILE_PARSER
1.1 cvs 55:
1.21 fefe 56: /* do you want the DNS routines to parse and use "domain" and "search"
57: * lines from /etc/resolv.conf? Normally not used on boot floppies and
58: * embedded environments. */
59: #define WANT_FULL_RESOLV_CONF
60:
1.45 fefe 61: /* do you want IPv6 transport support in the DNS resolver? */
62: #define WANT_IPV6_DNS
63:
1.27 fefe 64: /* do you want gethostbyname and friends to consult /etc/hosts? */
65: #define WANT_ETC_HOSTS
66:
1.46 fefe 67: /* do you want gethostbyname to understand dotted decimal IP numbers
68: * directly and not try to resolve them? */
69: #define WANT_INET_ADDR_DNS
70:
1.29 fefe 71: /* do you want math functions high precision rather than fast/small? */
72: #define WANT_HIGH_PRECISION_MATH
73:
74: /* do you want support for matherr? */
75: #define WANT_MATHERR
76:
1.30 fefe 77: /* do you want crypt(3) to use MD5 if the salt starts with "$1$"? */
78: #define WANT_CRYPT_MD5
79:
1.32 fefe 80: /* do you want diet to include a safeguard dependency to make linking
1.45 fefe 81: * against glibc fail? This may fail with older binutils. */
1.32 fefe 82: #define WANT_SAFEGUARD
1.38 olaf 83:
1.49 leitner 84: /* this enables an experimental DNS hack of mine.
85: * See http://www.fefe.de/ipv6pnpdns.html */
1.50 leitner 86: // #define WANT_IPV6_PLUGPLAY_DNS
1.49 leitner 87:
1.54 ! leitner 88: /* do you want that malloc(0) return a pointer to a "zero-length" object
1.38 olaf 89: * that is realloc-able; means realloc(..,size) gives a NEW object (like a
90: * call to malloc(size)).
91: * WARNING: this violates C99 */
92: /* #define WANT_MALLOC_ZERO */
93:
1.54 ! leitner 94: /* This enables a stack gap. Basically, the start code does not run
! 95: * main but stackgap, which then does alloca(random()) and calls main.
! 96: * The effect is that buffer overflow exploits will no longer be able to
! 97: * know the address of the buffer. Cost: 62 bytes code on x86. */
! 98: #define WANT_STACKGAP
1.32 fefe 99:
1.1 cvs 100: /* stop uncommenting here ;-) */
101: #ifndef WANT_FASTER_STRING_ROUTINES
102: #define WANT_SMALL_STRING_ROUTINES
1.4 fefe 103: #endif
104:
1.22 fefe 105: #ifdef WANT_THREAD_SAFE
1.44 fefe 106: #ifndef __ASSEMBLER__
1.22 fefe 107: #define errno (*__errno_location())
1.23 fefe 108: #define _REENTRANT
1.44 fefe 109: #endif
1.22 fefe 110: #endif
111:
1.33 olaf 112: #ifdef __DYN_LIB
1.39 olaf 113: /* with shared libraries you MUST have a dynamic aware startcode */
1.33 olaf 114: #ifndef WANT_DYNAMIC
115: #define WANT_DYNAMIC
1.35 olaf 116: #endif
117: /* saveguard crashes with shared objects ... */
118: #ifdef WANT_SAFEGUARD
119: #undef WANT_SAFEGUARD
1.33 olaf 120: #endif
121: #endif
122:
1.1 cvs 123: #endif
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