1 /* Get common system includes and various definitions and declarations
2    based on target macros.
3    Copyright (C) 2000-2018 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 extern void abort (void) __attribute__ ((__noreturn__));
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 */
138