code.delx.au - gnu-emacs/blob - src/conf_post.h

   1 /* conf_post.h --- configure.ac includes this via AH_BOTTOM
   2
   3 Copyright (C) 1988, 1993-1994, 1999-2002, 2004-2014 Free Software
   4 Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* Commentary:
  22
  23    Rather than writing this code directly in AH_BOTTOM, we include it
  24    via this file.  This is so that it does not get processed by
  25    autoheader.  Eg, any undefs here would otherwise be commented out.
  26 */
  27
  28 /* Code: */
  29
  30 /* Include any platform specific configuration file.  */
  31 #ifdef config_opsysfile
  32 # include config_opsysfile
  33 #endif
  34
  35 #include <stdbool.h>
  36
  37 /* The type of bool bitfields.  Needed to compile Objective-C with
  38    standard GCC.  It was also needed to port to pre-C99 compilers,
  39    although we don't care about that any more.  */
  40 #if NS_IMPL_GNUSTEP
  41 typedef unsigned int bool_bf;
  42 #else
  43 typedef bool bool_bf;
  44 #endif
  45
  46 #ifndef WINDOWSNT
  47 /* On AIX 3 this must be included before any other include file.  */
  48 #include <alloca.h>
  49 #if ! HAVE_ALLOCA
  50 # error "alloca not available on this machine"
  51 #endif
  52 #endif
  53
  54 /* When not using Clang, assume its attributes and features are absent.  */
  55 #ifndef __has_attribute
  56 # define __has_attribute(a) false
  57 #endif
  58 #ifndef __has_feature
  59 # define __has_feature(a) false
  60 #endif
  61
  62 /* True if addresses are being sanitized.  */
  63 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  64 # define ADDRESS_SANITIZER true
  65 #else
  66 # define ADDRESS_SANITIZER false
  67 #endif
  68
  69 #ifdef DARWIN_OS
  70 #ifdef emacs
  71 #define malloc unexec_malloc
  72 #define realloc unexec_realloc
  73 #define free unexec_free
  74 #endif
  75 /* The following solves the problem that Emacs hangs when evaluating
  76    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  77    does not exist.  Also, setsid is not allowed in the vfork child's
  78    context as of Darwin 9/Mac OS X 10.5.  */
  79 #undef HAVE_WORKING_VFORK
  80 #define vfork fork
  81 #endif  /* DARWIN_OS */
  82
  83 /* We have to go this route, rather than the old hpux9 approach of
  84    renaming the functions via macros.  The system's stdlib.h has fully
  85    prototyped declarations, which yields a conflicting definition of
  86    srand48; it tries to redeclare what was once srandom to be srand48.
  87    So we go with HAVE_LRAND48 being defined.  */
  88 #ifdef HPUX
  89 #undef srandom
  90 #undef random
  91 #undef HAVE_RANDOM
  92 #undef HAVE_RINT
  93 #endif  /* HPUX */
  94
  95 #ifdef IRIX6_5
  96 #ifdef emacs
  97 char *_getpty();
  98 #endif
  99 #define INET6 /* Needed for struct sockaddr_in6.  */
 100 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 101 #endif /* IRIX6_5 */
 102
 103 #ifdef MSDOS
 104 #ifndef __DJGPP__
 105 You lose; /* Emacs for DOS must be compiled with DJGPP */
 106 #endif
 107 #define _NAIVE_DOS_REGS
 108
 109 /* Start of gnulib-related stuff  */
 110
 111 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 112    2.03 has it, but it also has _strtold as a stub that jumps to
 113    strtold, so use _strtold in all versions.  */
 114 #define strtold _strtold
 115
 116 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 117 # define HAVE_LSTAT 1
 118 #else
 119 # define lstat stat
 120 #endif
 121
 122 /* We must intercept 'opendir' calls to stash away the directory name,
 123    so we could reuse it in readlinkat; see msdos.c.  */
 124 #define opendir sys_opendir
 125
 126 /* End of gnulib-related stuff.  */
 127
 128 #define emacs_raise(sig) msdos_fatal_signal (sig)
 129
 130 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 131 #define DATA_START (&etext + 1)
 132
 133 /* Define one of these for easier conditionals.  */
 134 #ifdef HAVE_X_WINDOWS
 135 /* We need a little extra space, see ../../lisp/loadup.el and the
 136    commentary below, in the non-X branch.  The 140KB number was
 137    measured on GNU/Linux and on MS-Windows.  */
 138 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 139 #else
 140 /* We need a little extra space, see ../../lisp/loadup.el.
 141    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 142    overall, we end up wasting 130KB of pure space, because
 143    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 144    non-DOS specific files and load history; the latter is about 55K,
 145    but depends on the depth of the top-level Emacs directory in the
 146    directory tree).  Given the unknown policy of different DPMI
 147    hosts regarding loading of untouched pages, I'm not going to risk
 148    enlarging Emacs footprint by another 100+ KBytes.  */
 149 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 150 #endif
 151 #endif  /* MSDOS */
 152
 153 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 154    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 155 #ifdef HAVE_NS
 156 #if defined NS_IMPL_GNUSTEP
 157 #  define SYSTEM_PURESIZE_EXTRA 30000
 158 #elif defined DARWIN_OS
 159 #  define SYSTEM_PURESIZE_EXTRA 200000
 160 #endif
 161 #endif
 162
 163 #ifdef CYGWIN
 164 #define SYSTEM_PURESIZE_EXTRA 10000
 165 #endif
 166
 167 #if defined HAVE_NTGUI && !defined DebPrint
 168 # ifdef EMACSDEBUG
 169 extern void _DebPrint (const char *fmt, ...);
 170 #  define DebPrint(stuff) _DebPrint stuff
 171 # else
 172 #  define DebPrint(stuff)
 173 # endif
 174 #endif
 175
 176 #if defined CYGWIN && defined HAVE_NTGUI
 177 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 178 # define _WIN32_WINNT 0x500 /* Win2k */
 179 #endif
 180
 181 #ifdef emacs /* Don't do this for lib-src.  */
 182 /* Tell regex.c to use a type compatible with Emacs.  */
 183 #define RE_TRANSLATE_TYPE Lisp_Object
 184 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 185 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 186 #endif
 187
 188 #include <string.h>
 189 #include <stdlib.h>
 190
 191 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 192 #define NO_INLINE __attribute__((noinline))
 193 #else
 194 #define NO_INLINE
 195 #endif
 196
 197 #if (__clang__                                                          \
 198      ? __has_attribute (externally_visible)                             \
 199      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 200 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 201 #else
 202 #define EXTERNALLY_VISIBLE
 203 #endif
 204
 205 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 206 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 207 #else
 208 # define ATTRIBUTE_FORMAT(spec) /* empty */
 209 #endif
 210
 211 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 212 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 213    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 214 #else
 215 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 216    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 217 #endif
 218
 219 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 220
 221 #if 3 <= __GNUC__
 222 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 223 #else
 224 # define ATTRIBUTE_MALLOC
 225 #endif
 226
 227 #if 4 < __GNUC__ + (3 <= __GNUC_MINOR__)
 228 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 229 #else
 230 # define ATTRIBUTE_ALLOC_SIZE(args)
 231 #endif
 232
 233 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 234
 235 /* Work around GCC bug 59600: when a function is inlined, the inlined
 236    code may have its addresses sanitized even if the function has the
 237    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 238    clang 3.4.  */
 239 #if (! ADDRESS_SANITIZER \
 240      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 241          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 242 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 243 #else
 244 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 245 #endif
 246
 247 /* Attribute of functions whose code should not have addresses
 248    sanitized.  */
 249
 250 #if (__has_attribute (no_sanitize_address) \
 251      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 252 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 253     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 254 #elif __has_attribute (no_address_safety_analysis)
 255 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 256     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 257 #else
 258 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 259 #endif
 260
 261 /* Some versions of GNU/Linux define noinline in their headers.  */
 262 #ifdef noinline
 263 #undef noinline
 264 #endif
 265
 266 /* Use Gnulib's extern-inline module for extern inline functions.
 267    An include file foo.h should prepend FOO_INLINE to function
 268    definitions, with the following overall pattern:
 269
 270       [#include any other .h files first.]
 271       ...
 272       INLINE_HEADER_BEGIN
 273       ...
 274       INLINE int
 275       incr (int i)
 276       {
 277         return i + 1;
 278       }
 279       ...
 280       INLINE_HEADER_END
 281
 282    For every executable, exactly one file that includes the header
 283    should do this:
 284
 285       #define INLINE EXTERN_INLINE
 286
 287    before including config.h or any other .h file.
 288    Other .c files should not define INLINE.
 289
 290    C99 compilers compile functions like 'incr' as C99-style extern
 291    inline functions.  Pre-C99 GCCs do something similar with
 292    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 293    functions, which bloats the code but is good enough.  */
 294
 295 #ifndef INLINE
 296 # define INLINE _GL_INLINE
 297 #endif
 298 #define EXTERN_INLINE _GL_EXTERN_INLINE
 299 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 300 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 301
 302 /* To use the struct hack with N elements, declare the struct like this:
 303      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 304    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 305    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 306 #ifdef __IBMC__
 307 # define FLEXIBLE_ARRAY_MEMBER 1
 308 #else
 309 # define FLEXIBLE_ARRAY_MEMBER
 310 #endif
 311
 312 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 313 #ifdef lint
 314 /* Use CODE only if lint checking is in effect.  */
 315 # define IF_LINT(Code) Code
 316 #else
 317 # define IF_LINT(Code) /* empty */
 318 #endif
 319
 320 /* conf_post.h ends here */