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 */