gcc/tsystem.h

   1 /* Get common system includes and various definitions and declarations
   2    based on target macros.
   3    Copyright (C) 2000, 2001, 2004, 2005 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #ifndef GCC_TSYSTEM_H
  30 #define GCC_TSYSTEM_H
  31
  32 /* System headers (e.g. stdio.h, stdlib.h, unistd.h) sometimes
  33    indirectly include getopt.h.  Our -I flags will cause gcc's gnu
  34    getopt.h to be included, not the platform's copy.  In the default
  35    case, gnu getopt.h will provide us with a no-argument prototype
  36    which will generate -Wstrict-prototypes warnings.  None of the
  37    target files actually use getopt, so it is safe to tell gnu
  38    getopt.h we never need this prototype.  */
  39 #ifndef HAVE_DECL_GETOPT
  40 #define HAVE_DECL_GETOPT 1
  41 #endif
  42
  43 /* We want everything from the glibc headers.  */
  44 #define _GNU_SOURCE 1
  45
  46 /* GCC supplies these headers.  */
  47 #include <stddef.h>
  48 #include <float.h>
  49
  50 #ifdef inhibit_libc
  51
  52 #ifndef malloc
  53 extern void *malloc (size_t);
  54 #endif
  55
  56 #ifndef free
  57 extern void free (void *);
  58 #endif
  59
  60 #ifndef atexit
  61 extern int atexit (void (*)(void));
  62 #endif
  63
  64 #ifndef abort
  65 extern void abort (void) __attribute__ ((__noreturn__));
  66 #endif
  67
  68 #ifndef strlen
  69 extern size_t strlen (const char *);
  70 #endif
  71
  72 #ifndef memcpy
  73 extern void *memcpy (void *, const void *, size_t);
  74 #endif
  75
  76 #ifndef memset
  77 extern void *memset (void *, int, size_t);
  78 #endif
  79
  80 #else /* ! inhibit_libc */
  81 /* We disable this when inhibit_libc, so that gcc can still be built without
  82    needing header files first.  */
  83 /* ??? This is not a good solution, since prototypes may be required in
  84    some cases for correct code.  */
  85
  86 /* GCC supplies this header.  */
  87 #include <stdarg.h>
  88
  89 /* All systems have this header.  */
  90 #include <stdio.h>
  91
  92 /* All systems have this header.  */
  93 #include <sys/types.h>
  94
  95 /* All systems have this header.  */
  96 #include <errno.h>
  97
  98 #ifndef errno
  99 extern int errno;
 100 #endif
 101
 102 /* GCC (fixproto) guarantees these system headers exist.  */
 103 #include <string.h>
 104 #include <stdlib.h>
 105 #include <unistd.h>
 106
 107 /* GCC supplies this header.  */
 108 #include <limits.h>
 109
 110 /* GCC (fixproto) guarantees this system headers exists.  */
 111 #include <time.h>
 112
 113 #endif /* inhibit_libc */
 114
 115 /* Define a generic NULL if one hasn't already been defined.  */
 116 #ifndef NULL
 117 #define NULL 0
 118 #endif
 119
 120 /* GCC always provides __builtin_alloca(x).  */
 121 #undef alloca
 122 #define alloca(x) __builtin_alloca(x)
 123
 124 #ifdef ENABLE_RUNTIME_CHECKING
 125 #define gcc_assert(EXPR) ((void)(!(EXPR) ? abort (), 0 : 0))
 126 #else
 127 /* Include EXPR, so that unused variable warnings do not occur.  */
 128 #define gcc_assert(EXPR) ((void)(0 && (EXPR)))
 129 #endif
 130 /* Use gcc_unreachable() to mark unreachable locations (like an
 131    unreachable default case of a switch.  Do not use gcc_assert(0).  */
 132 #define gcc_unreachable() (abort ())
 133
 134 /* Filename handling macros.  */
 135 #include "filenames.h"
 136
 137 #endif /* ! GCC_TSYSTEM_H */