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, 2004-2016 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 (at
  11 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 /* Simulate __has_attribute on compilers that lack it.  It is used only
  55    on arguments like alloc_size that are handled in this simulation.  */
  56 #ifndef __has_attribute
  57 # define __has_attribute(a) __has_attribute_##a
  58 # define __has_attribute_alloc_size (4 < __GNUC__ + (3 <= __GNUC_MINOR__))
  59 # define __has_attribute_cleanup (3 < __GNUC__ + (4 <= __GNUC_MINOR__))
  60 # define __has_attribute_externally_visible \
  61     (4 < __GNUC__ + (1 <= __GNUC_MINOR__))
  62 # define __has_attribute_no_address_safety_analysis false
  63 # define __has_attribute_no_sanitize_address \
  64     (4 < __GNUC__ + (8 <= __GNUC_MINOR__))
  65 #endif
  66
  67 /* Simulate __has_builtin on compilers that lack it.  It is used only
  68    on arguments like __builtin_assume_aligned that are handled in this
  69    simulation.  */
  70 #ifndef __has_builtin
  71 # define __has_builtin(a) __has_builtin_##a
  72 # define __has_builtin___builtin_assume_aligned \
  73     (4 < __GNUC__ + (7 <= __GNUC_MINOR__))
  74 #endif
  75
  76 /* Simulate __has_feature on compilers that lack it.  It is used only
  77    to define ADDRESS_SANITIZER below.  */
  78 #ifndef __has_feature
  79 # define __has_feature(a) false
  80 #endif
  81
  82 /* True if addresses are being sanitized.  */
  83 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  84 # define ADDRESS_SANITIZER true
  85 #else
  86 # define ADDRESS_SANITIZER false
  87 #endif
  88
  89 /* Yield PTR, which must be aligned to ALIGNMENT.  */
  90 #if ! __has_builtin (__builtin_assume_aligned)
  91 # define __builtin_assume_aligned(ptr, ...) ((void *) (ptr))
  92 #endif
  93
  94 #ifdef DARWIN_OS
  95 #ifdef emacs
  96 #define malloc unexec_malloc
  97 #define realloc unexec_realloc
  98 #define free unexec_free
  99 #endif
 100 /* The following solves the problem that Emacs hangs when evaluating
 101    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
 102    does not exist.  Also, setsid is not allowed in the vfork child's
 103    context as of Darwin 9/Mac OS X 10.5.  */
 104 #undef HAVE_WORKING_VFORK
 105 #define vfork fork
 106 #endif  /* DARWIN_OS */
 107
 108 /* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use
 109    gmalloc before dumping and the system malloc after dumping.
 110    hybrid_malloc and friends, defined in gmalloc.c, are wrappers that
 111    accomplish this.  */
 112 #ifdef HYBRID_MALLOC
 113 #ifdef emacs
 114 #define malloc hybrid_malloc
 115 #define realloc hybrid_realloc
 116 #define aligned_alloc hybrid_aligned_alloc
 117 #define calloc hybrid_calloc
 118 #define free hybrid_free
 119 #endif
 120 #endif  /* HYBRID_MALLOC */
 121
 122 /* We have to go this route, rather than the old hpux9 approach of
 123    renaming the functions via macros.  The system's stdlib.h has fully
 124    prototyped declarations, which yields a conflicting definition of
 125    srand48; it tries to redeclare what was once srandom to be srand48.
 126    So we go with HAVE_LRAND48 being defined.  */
 127 #ifdef HPUX
 128 #undef srandom
 129 #undef random
 130 #undef HAVE_RANDOM
 131 #undef HAVE_RINT
 132 #endif  /* HPUX */
 133
 134 #ifdef MSDOS
 135 #ifndef __DJGPP__
 136 You lose; /* Emacs for DOS must be compiled with DJGPP */
 137 #endif
 138 #define _NAIVE_DOS_REGS
 139
 140 /* Start of gnulib-related stuff  */
 141
 142 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 143    2.03 has it, but it also has _strtold as a stub that jumps to
 144    strtold, so use _strtold in all versions.  */
 145 #define strtold _strtold
 146
 147 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 148 # define HAVE_LSTAT 1
 149 #else
 150 # define lstat stat
 151 /* DJGPP 2.03 and older don't have the next two.  */
 152 # define EOVERFLOW ERANGE
 153 # define SIZE_MAX  4294967295U
 154 #endif
 155
 156 /* We must intercept 'opendir' calls to stash away the directory name,
 157    so we could reuse it in readlinkat; see msdos.c.  */
 158 #define opendir sys_opendir
 159
 160 /* End of gnulib-related stuff.  */
 161
 162 #define emacs_raise(sig) msdos_fatal_signal (sig)
 163
 164 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 165 #define DATA_START (&etext + 1)
 166
 167 /* Define one of these for easier conditionals.  */
 168 #ifdef HAVE_X_WINDOWS
 169 /* We need a little extra space, see ../../lisp/loadup.el and the
 170    commentary below, in the non-X branch.  The 140KB number was
 171    measured on GNU/Linux and on MS-Windows.  */
 172 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 173 #else
 174 /* We need a little extra space, see ../../lisp/loadup.el.
 175    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 176    overall, we end up wasting 130KB of pure space, because
 177    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 178    non-DOS specific files and load history; the latter is about 55K,
 179    but depends on the depth of the top-level Emacs directory in the
 180    directory tree).  Given the unknown policy of different DPMI
 181    hosts regarding loading of untouched pages, I'm not going to risk
 182    enlarging Emacs footprint by another 100+ KBytes.  */
 183 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 184 #endif
 185 #endif  /* MSDOS */
 186
 187 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 188    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 189 #ifdef HAVE_NS
 190 #if defined NS_IMPL_GNUSTEP
 191 #  define SYSTEM_PURESIZE_EXTRA 30000
 192 #elif defined DARWIN_OS
 193 #  define SYSTEM_PURESIZE_EXTRA 200000
 194 #endif
 195 #endif
 196
 197 #ifdef CYGWIN
 198 #define SYSTEM_PURESIZE_EXTRA 50000
 199 #endif
 200
 201 #if defined HAVE_NTGUI && !defined DebPrint
 202 # ifdef EMACSDEBUG
 203 extern void _DebPrint (const char *fmt, ...);
 204 #  define DebPrint(stuff) _DebPrint stuff
 205 # else
 206 #  define DebPrint(stuff)
 207 # endif
 208 #endif
 209
 210 #if defined CYGWIN && defined HAVE_NTGUI
 211 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 212 # define _WIN32_WINNT 0x500 /* Win2k */
 213 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 214 #ifndef strnicmp
 215 #define strnicmp strncasecmp
 216 #endif
 217 #endif
 218
 219 #ifdef emacs /* Don't do this for lib-src.  */
 220 /* Tell regex.c to use a type compatible with Emacs.  */
 221 #define RE_TRANSLATE_TYPE Lisp_Object
 222 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 223 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 224 #endif
 225
 226 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 227    Only Emacs uses time_rz so this is OK.  */
 228 #define getenv_TZ emacs_getenv_TZ
 229 #define setenv_TZ emacs_setenv_TZ
 230 extern char *emacs_getenv_TZ (void);
 231 extern int emacs_setenv_TZ (char const *);
 232
 233 #include <string.h>
 234 #include <stdlib.h>
 235
 236 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 237 #define NO_INLINE __attribute__((noinline))
 238 #else
 239 #define NO_INLINE
 240 #endif
 241
 242 #if __has_attribute (externally_visible)
 243 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 244 #else
 245 #define EXTERNALLY_VISIBLE
 246 #endif
 247
 248 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 249 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 250 #else
 251 # define ATTRIBUTE_FORMAT(spec) /* empty */
 252 #endif
 253
 254 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 255 # ifdef __MINGW32__
 256 #  define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 257     ATTRIBUTE_FORMAT ((__ms_printf__, formatstring_parameter, first_argument))
 258 #else  /* !__MINGW32__ */
 259 #  define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 260     ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 261 #endif  /* !__MINGW32__ */
 262 #else   /* __GNUC__ < 4.4 */
 263 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 264    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 265 #endif  /* __GNUC__ < 4.4 */
 266
 267 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 268 #define ATTRIBUTE_UNUSED _GL_UNUSED
 269
 270 #if 3 <= __GNUC__
 271 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 272 #else
 273 # define ATTRIBUTE_MALLOC
 274 #endif
 275
 276 #if __has_attribute (alloc_size)
 277 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 278 #else
 279 # define ATTRIBUTE_ALLOC_SIZE(args)
 280 #endif
 281
 282 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 283
 284 /* Work around GCC bug 59600: when a function is inlined, the inlined
 285    code may have its addresses sanitized even if the function has the
 286    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 287    clang 3.4.  */
 288 #if (! ADDRESS_SANITIZER \
 289      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 290          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 291 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 292 #else
 293 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 294 #endif
 295
 296 /* Attribute of functions whose code should not have addresses
 297    sanitized.  */
 298
 299 #if __has_attribute (no_sanitize_address)
 300 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 301     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 302 #elif __has_attribute (no_address_safety_analysis)
 303 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 304     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 305 #else
 306 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 307 #endif
 308
 309 /* Some versions of GNU/Linux define noinline in their headers.  */
 310 #ifdef noinline
 311 #undef noinline
 312 #endif
 313
 314 /* Use Gnulib's extern-inline module for extern inline functions.
 315    An include file foo.h should prepend FOO_INLINE to function
 316    definitions, with the following overall pattern:
 317
 318       [#include any other .h files first.]
 319       ...
 320       INLINE_HEADER_BEGIN
 321       ...
 322       INLINE int
 323       incr (int i)
 324       {
 325         return i + 1;
 326       }
 327       ...
 328       INLINE_HEADER_END
 329
 330    For every executable, exactly one file that includes the header
 331    should do this:
 332
 333       #define INLINE EXTERN_INLINE
 334
 335    before including config.h or any other .h file.
 336    Other .c files should not define INLINE.
 337    For Emacs, this is done by having emacs.c first '#define INLINE
 338    EXTERN_INLINE' and then include every .h file that uses INLINE.
 339
 340    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 341    warnings in some GCC versions; see ../m4/extern-inline.m4.
 342
 343    C99 compilers compile functions like 'incr' as C99-style extern
 344    inline functions.  Buggy GCC implementations do something similar with
 345    GNU-specific keywords.  Buggy non-GCC compilers use static
 346    functions, which bloats the code but is good enough.  */
 347
 348 #ifndef INLINE
 349 # define INLINE _GL_INLINE
 350 #endif
 351 #define EXTERN_INLINE _GL_EXTERN_INLINE
 352 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 353 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 354
 355 /* To use the struct hack with N elements, declare the struct like this:
 356      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 357    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 358    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 359 #ifdef __IBMC__
 360 # define FLEXIBLE_ARRAY_MEMBER 1
 361 #else
 362 # define FLEXIBLE_ARRAY_MEMBER
 363 #endif
 364
 365 /* When used in place of 'volatile', 'NONVOLATILE' is equivalent to nothing,
 366    except it cajoles GCC into not warning incorrectly that a variable needs to
 367    be volatile.  This works around GCC bug 54561.  */
 368 #if defined GCC_LINT || defined lint
 369 # define NONVOLATILE volatile
 370 #else
 371 # define NONVOLATILE /* empty */
 372 #endif
 373
 374 /* 'int x UNINIT;' is equivalent to 'int x;', except it cajoles GCC
 375    into not warning incorrectly about use of an uninitialized variable.  */
 376 #if defined GCC_LINT || defined lint
 377 # define UNINIT = {0,}
 378 #else
 379 # define UNINIT /* empty */
 380 #endif
 381
 382 /* conf_post.h ends here */