gcc/tsystem.h

   1 /* Get common system includes and various definitions and declarations
   2    based on target macros.
   3    Copyright (C) 2000-2023 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 3, 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 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef GCC_TSYSTEM_H
  27 #define GCC_TSYSTEM_H
  28
  29 /* System headers (e.g. stdio.h, stdlib.h, unistd.h) sometimes
  30    indirectly include getopt.h.  Our -I flags will cause gcc's gnu
  31    getopt.h to be included, not the platform's copy.  In the default
  32    case, gnu getopt.h will provide us with a no-argument prototype
  33    which will generate -Wstrict-prototypes warnings.  None of the
  34    target files actually use getopt, so it is safe to tell gnu
  35    getopt.h we never need this prototype.  */
  36 #ifndef HAVE_DECL_GETOPT
  37 #define HAVE_DECL_GETOPT 1
  38 #endif
  39
  40 /* We want everything from the glibc headers.  */
  41 #define _GNU_SOURCE 1
  42
  43 /* GCC supplies these headers.  */
  44 #include <stddef.h>
  45 #include <float.h>
  46
  47 #ifdef inhibit_libc
  48
  49 #ifndef malloc
  50 extern void *malloc (size_t);
  51 #endif
  52
  53 #ifndef free
  54 extern void free (void *);
  55 #endif
  56
  57 #ifndef atexit
  58 extern int atexit (void (*)(void));
  59 #endif
  60
  61 #ifndef abort
  62 #define abort() __builtin_trap ()
  63 #endif
  64
  65 #ifndef strlen
  66 extern size_t strlen (const char *);
  67 #endif
  68
  69 #ifndef memcpy
  70 extern void *memcpy (void *, const void *, size_t);
  71 #endif
  72
  73 #ifndef memset
  74 extern void *memset (void *, int, size_t);
  75 #endif
  76
  77 #else /* ! inhibit_libc */
  78 /* We disable this when inhibit_libc, so that gcc can still be built without
  79    needing header files first.  */
  80 /* ??? This is not a good solution, since prototypes may be required in
  81    some cases for correct code.  */
  82
  83 /* GCC supplies this header.  */
  84 #include <stdarg.h>
  85
  86 /* All systems have this header.  */
  87 #include <stdio.h>
  88
  89 /* All systems have this header.  */
  90 #include <sys/types.h>
  91
  92 /* All systems have this header.  */
  93 #include <errno.h>
  94
  95 #ifndef errno
  96 extern int errno;
  97 #endif
  98
  99 /* If these system headers do not exist, fixincludes must create them.  */
 100 #include <string.h>
 101 #include <stdlib.h>
 102 #include <unistd.h>
 103
 104 /* GCC supplies this header.  */
 105 #include <limits.h>
 106
 107 /* If these system headers do not exist, fixincludes must create them.  */
 108 #include <time.h>
 109
 110 #endif /* inhibit_libc */
 111
 112 /* Define a generic NULL if one hasn't already been defined.  */
 113 #ifndef NULL
 114 #define NULL 0
 115 #endif
 116
 117 /* GCC always provides __builtin_alloca(x).  */
 118 #undef alloca
 119 #define alloca(x) __builtin_alloca(x)
 120
 121 #ifdef ENABLE_RUNTIME_CHECKING
 122 #define gcc_assert(EXPR) ((void)(!(EXPR) ? abort (), 0 : 0))
 123 #else
 124 /* Include EXPR, so that unused variable warnings do not occur.  */
 125 #define gcc_assert(EXPR) ((void)(0 && (EXPR)))
 126 #endif
 127 /* Use gcc_unreachable() to mark unreachable locations (like an
 128    unreachable default case of a switch.  Do not use gcc_assert(0).  */
 129 #define gcc_unreachable() (abort ())
 130
 131 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
 132 #define CONST_CAST(TYPE,X) CONST_CAST2 (TYPE, const TYPE, (X))
 133
 134 /* Filename handling macros.  */
 135 #include "filenames.h"
 136
 137 #endif /* ! GCC_TSYSTEM_H */