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 /* GNUC_PREREQ (V, W, X) is true if this is GNU C version V.W.X or later.
  38    It can be used in a preprocessor expression.  */
  39 #ifndef __GNUC_MINOR__
  40 # define GNUC_PREREQ(v, w, x) false
  41 #elif ! defined __GNUC_PATCHLEVEL__
  42 # define GNUC_PREREQ(v, w, x) ((v) < __GNUC__ + ((w) <= __GNUC_MINOR__))
  43 #else
  44 # define GNUC_PREREQ(v, w, x) \
  45     ((v) < __GNUC__ + ((w) <= __GNUC_MINOR__ + ((x) <= __GNUC_PATCHLEVEL__)))
  46 #endif
  47
  48 /* The type of bool bitfields.  Needed to compile Objective-C with
  49    standard GCC.  It was also needed to port to pre-C99 compilers,
  50    although we don't care about that any more.  */
  51 #if NS_IMPL_GNUSTEP
  52 typedef unsigned int bool_bf;
  53 #else
  54 typedef bool bool_bf;
  55 #endif
  56
  57 #ifndef WINDOWSNT
  58 /* On AIX 3 this must be included before any other include file.  */
  59 #include <alloca.h>
  60 #if ! HAVE_ALLOCA
  61 # error "alloca not available on this machine"
  62 #endif
  63 #endif
  64
  65 /* Simulate __has_attribute on compilers that lack it.  It is used only
  66    on arguments like alloc_size that are handled in this simulation.  */
  67 #ifndef __has_attribute
  68 # define __has_attribute(a) __has_attribute_##a
  69 # define __has_attribute_alloc_size GNUC_PREREQ (4, 3, 0)
  70 # define __has_attribute_cleanup GNUC_PREREQ (3, 4, 0)
  71 # define __has_attribute_externally_visible GNUC_PREREQ (4, 1, 0)
  72 # define __has_attribute_no_address_safety_analysis false
  73 # define __has_attribute_no_sanitize_address GNUC_PREREQ (4, 8, 0)
  74 #endif
  75
  76 /* Simulate __has_builtin on compilers that lack it.  It is used only
  77    on arguments like __builtin_assume_aligned that are handled in this
  78    simulation.  */
  79 #ifndef __has_builtin
  80 # define __has_builtin(a) __has_builtin_##a
  81 # define __has_builtin___builtin_assume_aligned GNUC_PREREQ (4, 7, 0)
  82 #endif
  83
  84 /* Simulate __has_feature on compilers that lack it.  It is used only
  85    to define ADDRESS_SANITIZER below.  */
  86 #ifndef __has_feature
  87 # define __has_feature(a) false
  88 #endif
  89
  90 /* True if addresses are being sanitized.  */
  91 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  92 # define ADDRESS_SANITIZER true
  93 #else
  94 # define ADDRESS_SANITIZER false
  95 #endif
  96
  97 /* Yield PTR, which must be aligned to ALIGNMENT.  */
  98 #if ! __has_builtin (__builtin_assume_aligned)
  99 # define __builtin_assume_aligned(ptr, ...) ((void *) (ptr))
 100 #endif
 101
 102 #ifdef DARWIN_OS
 103 #ifdef emacs
 104 #define malloc unexec_malloc
 105 #define realloc unexec_realloc
 106 #define free unexec_free
 107 #endif
 108 /* The following solves the problem that Emacs hangs when evaluating
 109    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
 110    does not exist.  Also, setsid is not allowed in the vfork child's
 111    context as of Darwin 9/Mac OS X 10.5.  */
 112 #undef HAVE_WORKING_VFORK
 113 #define vfork fork
 114 #endif  /* DARWIN_OS */
 115
 116 /* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use
 117    gmalloc before dumping and the system malloc after dumping.
 118    hybrid_malloc and friends, defined in gmalloc.c, are wrappers that
 119    accomplish this.  */
 120 #ifdef HYBRID_MALLOC
 121 #ifdef emacs
 122 #define malloc hybrid_malloc
 123 #define realloc hybrid_realloc
 124 #define aligned_alloc hybrid_aligned_alloc
 125 #define calloc hybrid_calloc
 126 #define free hybrid_free
 127 #endif
 128 #endif  /* HYBRID_MALLOC */
 129
 130 /* We have to go this route, rather than the old hpux9 approach of
 131    renaming the functions via macros.  The system's stdlib.h has fully
 132    prototyped declarations, which yields a conflicting definition of
 133    srand48; it tries to redeclare what was once srandom to be srand48.
 134    So we go with HAVE_LRAND48 being defined.  */
 135 #ifdef HPUX
 136 #undef srandom
 137 #undef random
 138 #undef HAVE_RANDOM
 139 #undef HAVE_RINT
 140 #endif  /* HPUX */
 141
 142 #ifdef MSDOS
 143 #ifndef __DJGPP__
 144 You lose; /* Emacs for DOS must be compiled with DJGPP */
 145 #endif
 146 #define _NAIVE_DOS_REGS
 147
 148 /* Start of gnulib-related stuff  */
 149
 150 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 151    2.03 has it, but it also has _strtold as a stub that jumps to
 152    strtold, so use _strtold in all versions.  */
 153 #define strtold _strtold
 154
 155 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 156 # define HAVE_LSTAT 1
 157 #else
 158 # define lstat stat
 159 /* DJGPP 2.03 and older don't have the next two.  */
 160 # define EOVERFLOW ERANGE
 161 # define SIZE_MAX  4294967295U
 162 #endif
 163
 164 /* We must intercept 'opendir' calls to stash away the directory name,
 165    so we could reuse it in readlinkat; see msdos.c.  */
 166 #define opendir sys_opendir
 167
 168 /* End of gnulib-related stuff.  */
 169
 170 #define emacs_raise(sig) msdos_fatal_signal (sig)
 171
 172 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 173 #define DATA_START (&etext + 1)
 174
 175 /* Define one of these for easier conditionals.  */
 176 #ifdef HAVE_X_WINDOWS
 177 /* We need a little extra space, see ../../lisp/loadup.el and the
 178    commentary below, in the non-X branch.  The 140KB number was
 179    measured on GNU/Linux and on MS-Windows.  */
 180 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 181 #else
 182 /* We need a little extra space, see ../../lisp/loadup.el.
 183    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 184    overall, we end up wasting 130KB of pure space, because
 185    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 186    non-DOS specific files and load history; the latter is about 55K,
 187    but depends on the depth of the top-level Emacs directory in the
 188    directory tree).  Given the unknown policy of different DPMI
 189    hosts regarding loading of untouched pages, I'm not going to risk
 190    enlarging Emacs footprint by another 100+ KBytes.  */
 191 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 192 #endif
 193 #endif  /* MSDOS */
 194
 195 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 196    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 197 #ifdef HAVE_NS
 198 #if defined NS_IMPL_GNUSTEP
 199 #  define SYSTEM_PURESIZE_EXTRA 30000
 200 #elif defined DARWIN_OS
 201 #  define SYSTEM_PURESIZE_EXTRA 200000
 202 #endif
 203 #endif
 204
 205 #ifdef CYGWIN
 206 #define SYSTEM_PURESIZE_EXTRA 50000
 207 #endif
 208
 209 #if defined HAVE_NTGUI && !defined DebPrint
 210 # ifdef EMACSDEBUG
 211 extern void _DebPrint (const char *fmt, ...);
 212 #  define DebPrint(stuff) _DebPrint stuff
 213 # else
 214 #  define DebPrint(stuff)
 215 # endif
 216 #endif
 217
 218 #if defined CYGWIN && defined HAVE_NTGUI
 219 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 220 # define _WIN32_WINNT 0x500 /* Win2k */
 221 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 222 #ifndef strnicmp
 223 #define strnicmp strncasecmp
 224 #endif
 225 #endif
 226
 227 #ifdef emacs /* Don't do this for lib-src.  */
 228 /* Tell regex.c to use a type compatible with Emacs.  */
 229 #define RE_TRANSLATE_TYPE Lisp_Object
 230 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 231 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 232 #endif
 233
 234 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 235    Only Emacs uses time_rz so this is OK.  */
 236 #define getenv_TZ emacs_getenv_TZ
 237 #define setenv_TZ emacs_setenv_TZ
 238 extern char *emacs_getenv_TZ (void);
 239 extern int emacs_setenv_TZ (char const *);
 240
 241 #include <string.h>
 242 #include <stdlib.h>
 243
 244 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 245 #define NO_INLINE __attribute__((noinline))
 246 #else
 247 #define NO_INLINE
 248 #endif
 249
 250 #if __has_attribute (externally_visible)
 251 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 252 #else
 253 #define EXTERNALLY_VISIBLE
 254 #endif
 255
 256 #if GNUC_PREREQ (2, 7, 0)
 257 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 258 #else
 259 # define ATTRIBUTE_FORMAT(spec) /* empty */
 260 #endif
 261
 262 #if GNUC_PREREQ (4, 4, 0) && defined __GLIBC_MINOR__
 263 # define PRINTF_ARCHETYPE __gnu_printf__
 264 #elif GNUC_PREREQ (4, 4, 0) && defined __MINGW32__
 265 # define PRINTF_ARCHETYPE __ms_printf__
 266 #else
 267 # define PRINTF_ARCHETYPE __printf__
 268 #endif
 269 #define ATTRIBUTE_FORMAT_PRINTF(string_index, first_to_check) \
 270   ATTRIBUTE_FORMAT ((PRINTF_ARCHETYPE, string_index, first_to_check))
 271
 272 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 273 #define ATTRIBUTE_UNUSED _GL_UNUSED
 274
 275 #if 3 <= __GNUC__
 276 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 277 #else
 278 # define ATTRIBUTE_MALLOC
 279 #endif
 280
 281 #if __has_attribute (alloc_size)
 282 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 283 #else
 284 # define ATTRIBUTE_ALLOC_SIZE(args)
 285 #endif
 286
 287 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 288
 289 /* Work around GCC bug 59600: when a function is inlined, the inlined
 290    code may have its addresses sanitized even if the function has the
 291    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 292    clang 3.4.  */
 293 #if (! ADDRESS_SANITIZER \
 294      || (GNUC_PREREQ (4, 9, 0) \
 295          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 296 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 297 #else
 298 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 299 #endif
 300
 301 /* Attribute of functions whose code should not have addresses
 302    sanitized.  */
 303
 304 #if __has_attribute (no_sanitize_address)
 305 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 306     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 307 #elif __has_attribute (no_address_safety_analysis)
 308 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 309     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 310 #else
 311 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 312 #endif
 313
 314 /* Some versions of GNU/Linux define noinline in their headers.  */
 315 #ifdef noinline
 316 #undef noinline
 317 #endif
 318
 319 /* Use Gnulib's extern-inline module for extern inline functions.
 320    An include file foo.h should prepend FOO_INLINE to function
 321    definitions, with the following overall pattern:
 322
 323       [#include any other .h files first.]
 324       ...
 325       INLINE_HEADER_BEGIN
 326       ...
 327       INLINE int
 328       incr (int i)
 329       {
 330         return i + 1;
 331       }
 332       ...
 333       INLINE_HEADER_END
 334
 335    For every executable, exactly one file that includes the header
 336    should do this:
 337
 338       #define INLINE EXTERN_INLINE
 339
 340    before including config.h or any other .h file.
 341    Other .c files should not define INLINE.
 342    For Emacs, this is done by having emacs.c first '#define INLINE
 343    EXTERN_INLINE' and then include every .h file that uses INLINE.
 344
 345    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 346    warnings in some GCC versions; see ../m4/extern-inline.m4.
 347
 348    C99 compilers compile functions like 'incr' as C99-style extern
 349    inline functions.  Buggy GCC implementations do something similar with
 350    GNU-specific keywords.  Buggy non-GCC compilers use static
 351    functions, which bloats the code but is good enough.  */
 352
 353 #ifndef INLINE
 354 # define INLINE _GL_INLINE
 355 #endif
 356 #define EXTERN_INLINE _GL_EXTERN_INLINE
 357 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 358 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 359
 360 /* To use the struct hack with N elements, declare the struct like this:
 361      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 362    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 363    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 364 #ifdef __IBMC__
 365 # define FLEXIBLE_ARRAY_MEMBER 1
 366 #else
 367 # define FLEXIBLE_ARRAY_MEMBER
 368 #endif
 369
 370 /* When used in place of 'volatile', 'NONVOLATILE' is equivalent to nothing,
 371    except it cajoles GCC into not warning incorrectly that a variable needs to
 372    be volatile.  This works around GCC bug 54561.  */
 373 #if defined GCC_LINT || defined lint
 374 # define NONVOLATILE volatile
 375 #else
 376 # define NONVOLATILE /* empty */
 377 #endif
 378
 379 /* 'int x UNINIT;' is equivalent to 'int x;', except it cajoles GCC
 380    into not warning incorrectly about use of an uninitialized variable.  */
 381 #if defined GCC_LINT || defined lint
 382 # define UNINIT = {0,}
 383 #else
 384 # define UNINIT /* empty */
 385 #endif
 386
 387 /* conf_post.h ends here */