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, 2009, 2011
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef GCC_TSYSTEM_H
  28 #define GCC_TSYSTEM_H
  29
  30 /* System headers (e.g. stdio.h, stdlib.h, unistd.h) sometimes
  31    indirectly include getopt.h.  Our -I flags will cause gcc's gnu
  32    getopt.h to be included, not the platform's copy.  In the default
  33    case, gnu getopt.h will provide us with a no-argument prototype
  34    which will generate -Wstrict-prototypes warnings.  None of the
  35    target files actually use getopt, so it is safe to tell gnu
  36    getopt.h we never need this prototype.  */
  37 #ifndef HAVE_DECL_GETOPT
  38 #define HAVE_DECL_GETOPT 1
  39 #endif
  40
  41 /* We want everything from the glibc headers.  */
  42 #define _GNU_SOURCE 1
  43
  44 /* GCC supplies these headers.  */
  45 #include <stddef.h>
  46 #include <float.h>
  47
  48 #ifdef inhibit_libc
  49
  50 #ifndef malloc
  51 extern void *malloc (size_t);
  52 #endif
  53
  54 #ifndef free
  55 extern void free (void *);
  56 #endif
  57
  58 #ifndef atexit
  59 extern int atexit (void (*)(void));
  60 #endif
  61
  62 #ifndef abort
  63 extern void abort (void) __attribute__ ((__noreturn__));
  64 #endif
  65
  66 #ifndef strlen
  67 extern size_t strlen (const char *);
  68 #endif
  69
  70 #ifndef memcpy
  71 extern void *memcpy (void *, const void *, size_t);
  72 #endif
  73
  74 #ifndef memset
  75 extern void *memset (void *, int, size_t);
  76 #endif
  77
  78 #else /* ! inhibit_libc */
  79 /* We disable this when inhibit_libc, so that gcc can still be built without
  80    needing header files first.  */
  81 /* ??? This is not a good solution, since prototypes may be required in
  82    some cases for correct code.  */
  83
  84 /* GCC supplies this header.  */
  85 #include <stdarg.h>
  86
  87 /* All systems have this header.  */
  88 #include <stdio.h>
  89
  90 /* All systems have this header.  */
  91 #include <sys/types.h>
  92
  93 /* All systems have this header.  */
  94 #include <errno.h>
  95
  96 #ifndef errno
  97 extern int errno;
  98 #endif
  99
 100 /* If these system headers do not exist, fixincludes must create them.  */
 101 #include <string.h>
 102 #include <stdlib.h>
 103 #include <unistd.h>
 104
 105 /* GCC supplies this header.  */
 106 #include <limits.h>
 107
 108 /* If these system headers do not exist, fixincludes must create them.  */
 109 #include <time.h>
 110
 111 #endif /* inhibit_libc */
 112
 113 /* Define a generic NULL if one hasn't already been defined.  */
 114 #ifndef NULL
 115 #define NULL 0
 116 #endif
 117
 118 /* GCC always provides __builtin_alloca(x).  */
 119 #undef alloca
 120 #define alloca(x) __builtin_alloca(x)
 121
 122 #ifdef ENABLE_RUNTIME_CHECKING
 123 #define gcc_assert(EXPR) ((void)(!(EXPR) ? abort (), 0 : 0))
 124 #else
 125 /* Include EXPR, so that unused variable warnings do not occur.  */
 126 #define gcc_assert(EXPR) ((void)(0 && (EXPR)))
 127 #endif
 128 /* Use gcc_unreachable() to mark unreachable locations (like an
 129    unreachable default case of a switch.  Do not use gcc_assert(0).  */
 130 #define gcc_unreachable() (abort ())
 131
 132 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
 133 #define CONST_CAST(TYPE,X) CONST_CAST2(TYPE, const TYPE, (X))
 134
 135 /* Filename handling macros.  */
 136 #include "filenames.h"
 137
 138 #endif /* ! GCC_TSYSTEM_H */