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
  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 /* 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_feature on compilers that lack it.  It is used only
  68    to define ADDRESS_SANITIZER below.  */
  69 #ifndef __has_feature
  70 # define __has_feature(a) false
  71 #endif
  72
  73 /* True if addresses are being sanitized.  */
  74 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  75 # define ADDRESS_SANITIZER true
  76 #else
  77 # define ADDRESS_SANITIZER false
  78 #endif
  79
  80 #ifdef DARWIN_OS
  81 #ifdef emacs
  82 #define malloc unexec_malloc
  83 #define realloc unexec_realloc
  84 #define free unexec_free
  85 #endif
  86 /* The following solves the problem that Emacs hangs when evaluating
  87    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  88    does not exist.  Also, setsid is not allowed in the vfork child's
  89    context as of Darwin 9/Mac OS X 10.5.  */
  90 #undef HAVE_WORKING_VFORK
  91 #define vfork fork
  92 #endif  /* DARWIN_OS */
  93
  94 /* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use
  95    gmalloc before dumping and the system malloc after dumping.
  96    hybrid_malloc and friends, defined in gmalloc.c, are wrappers that
  97    accomplish this.  */
  98 #ifdef HYBRID_MALLOC
  99 #ifdef emacs
 100 #define malloc hybrid_malloc
 101 #define realloc hybrid_realloc
 102 #define aligned_alloc hybrid_aligned_alloc
 103 #define free hybrid_free
 104 #endif
 105 #endif  /* HYBRID_MALLOC */
 106
 107 /* We have to go this route, rather than the old hpux9 approach of
 108    renaming the functions via macros.  The system's stdlib.h has fully
 109    prototyped declarations, which yields a conflicting definition of
 110    srand48; it tries to redeclare what was once srandom to be srand48.
 111    So we go with HAVE_LRAND48 being defined.  */
 112 #ifdef HPUX
 113 #undef srandom
 114 #undef random
 115 #undef HAVE_RANDOM
 116 #undef HAVE_RINT
 117 #endif  /* HPUX */
 118
 119 #ifdef IRIX6_5
 120 #ifdef emacs
 121 char *_getpty();
 122 #endif
 123 #define INET6 /* Needed for struct sockaddr_in6.  */
 124 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 125 #endif /* IRIX6_5 */
 126
 127 #ifdef MSDOS
 128 #ifndef __DJGPP__
 129 You lose; /* Emacs for DOS must be compiled with DJGPP */
 130 #endif
 131 #define _NAIVE_DOS_REGS
 132
 133 /* Start of gnulib-related stuff  */
 134
 135 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 136    2.03 has it, but it also has _strtold as a stub that jumps to
 137    strtold, so use _strtold in all versions.  */
 138 #define strtold _strtold
 139
 140 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 141 # define HAVE_LSTAT 1
 142 #else
 143 # define lstat stat
 144 #endif
 145
 146 /* We must intercept 'opendir' calls to stash away the directory name,
 147    so we could reuse it in readlinkat; see msdos.c.  */
 148 #define opendir sys_opendir
 149
 150 /* End of gnulib-related stuff.  */
 151
 152 #define emacs_raise(sig) msdos_fatal_signal (sig)
 153
 154 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 155 #define DATA_START (&etext + 1)
 156
 157 /* Define one of these for easier conditionals.  */
 158 #ifdef HAVE_X_WINDOWS
 159 /* We need a little extra space, see ../../lisp/loadup.el and the
 160    commentary below, in the non-X branch.  The 140KB number was
 161    measured on GNU/Linux and on MS-Windows.  */
 162 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 163 #else
 164 /* We need a little extra space, see ../../lisp/loadup.el.
 165    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 166    overall, we end up wasting 130KB of pure space, because
 167    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 168    non-DOS specific files and load history; the latter is about 55K,
 169    but depends on the depth of the top-level Emacs directory in the
 170    directory tree).  Given the unknown policy of different DPMI
 171    hosts regarding loading of untouched pages, I'm not going to risk
 172    enlarging Emacs footprint by another 100+ KBytes.  */
 173 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 174 #endif
 175 #endif  /* MSDOS */
 176
 177 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 178    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 179 #ifdef HAVE_NS
 180 #if defined NS_IMPL_GNUSTEP
 181 #  define SYSTEM_PURESIZE_EXTRA 30000
 182 #elif defined DARWIN_OS
 183 #  define SYSTEM_PURESIZE_EXTRA 200000
 184 #endif
 185 #endif
 186
 187 #ifdef CYGWIN
 188 #define SYSTEM_PURESIZE_EXTRA 10000
 189 #endif
 190
 191 #if defined HAVE_NTGUI && !defined DebPrint
 192 # ifdef EMACSDEBUG
 193 extern void _DebPrint (const char *fmt, ...);
 194 #  define DebPrint(stuff) _DebPrint stuff
 195 # else
 196 #  define DebPrint(stuff)
 197 # endif
 198 #endif
 199
 200 #if defined CYGWIN && defined HAVE_NTGUI
 201 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 202 # define _WIN32_WINNT 0x500 /* Win2k */
 203 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 204 #ifndef strnicmp
 205 #define strnicmp strncasecmp
 206 #endif
 207 #endif
 208
 209 #ifdef emacs /* Don't do this for lib-src.  */
 210 /* Tell regex.c to use a type compatible with Emacs.  */
 211 #define RE_TRANSLATE_TYPE Lisp_Object
 212 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 213 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 214 #endif
 215
 216 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 217    Only Emacs uses time_rz so this is OK.  */
 218 #define getenv_TZ emacs_getenv_TZ
 219 #define setenv_TZ emacs_setenv_TZ
 220 extern char *emacs_getenv_TZ (void);
 221 extern int emacs_setenv_TZ (char const *);
 222
 223 #include <string.h>
 224 #include <stdlib.h>
 225
 226 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 227 #define NO_INLINE __attribute__((noinline))
 228 #else
 229 #define NO_INLINE
 230 #endif
 231
 232 #if __has_attribute (externally_visible)
 233 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 234 #else
 235 #define EXTERNALLY_VISIBLE
 236 #endif
 237
 238 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 239 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 240 #else
 241 # define ATTRIBUTE_FORMAT(spec) /* empty */
 242 #endif
 243
 244 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 245 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 246    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 247 #else
 248 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 249    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 250 #endif
 251
 252 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 253 #define ATTRIBUTE_UNUSED _GL_UNUSED
 254
 255 #if 3 <= __GNUC__
 256 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 257 #else
 258 # define ATTRIBUTE_MALLOC
 259 #endif
 260
 261 #if __has_attribute (alloc_size)
 262 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 263 #else
 264 # define ATTRIBUTE_ALLOC_SIZE(args)
 265 #endif
 266
 267 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 268
 269 /* Work around GCC bug 59600: when a function is inlined, the inlined
 270    code may have its addresses sanitized even if the function has the
 271    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 272    clang 3.4.  */
 273 #if (! ADDRESS_SANITIZER \
 274      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 275          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 276 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 277 #else
 278 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 279 #endif
 280
 281 /* Attribute of functions whose code should not have addresses
 282    sanitized.  */
 283
 284 #if __has_attribute (no_sanitize_address)
 285 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 286     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 287 #elif __has_attribute (no_address_safety_analysis)
 288 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 289     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 290 #else
 291 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 292 #endif
 293
 294 /* Some versions of GNU/Linux define noinline in their headers.  */
 295 #ifdef noinline
 296 #undef noinline
 297 #endif
 298
 299 /* Use Gnulib's extern-inline module for extern inline functions.
 300    An include file foo.h should prepend FOO_INLINE to function
 301    definitions, with the following overall pattern:
 302
 303       [#include any other .h files first.]
 304       ...
 305       INLINE_HEADER_BEGIN
 306       ...
 307       INLINE int
 308       incr (int i)
 309       {
 310         return i + 1;
 311       }
 312       ...
 313       INLINE_HEADER_END
 314
 315    For every executable, exactly one file that includes the header
 316    should do this:
 317
 318       #define INLINE EXTERN_INLINE
 319
 320    before including config.h or any other .h file.
 321    Other .c files should not define INLINE.
 322    For Emacs, this is done by having emacs.c first '#define INLINE
 323    EXTERN_INLINE' and then include every .h file that uses INLINE.
 324
 325    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 326    warnings in some GCC versions; see ../m4/extern-inline.m4.
 327
 328    C99 compilers compile functions like 'incr' as C99-style extern
 329    inline functions.  Buggy GCC implementations do something similar with
 330    GNU-specific keywords.  Buggy non-GCC compilers use static
 331    functions, which bloats the code but is good enough.  */
 332
 333 #ifndef INLINE
 334 # define INLINE _GL_INLINE
 335 #endif
 336 #define EXTERN_INLINE _GL_EXTERN_INLINE
 337 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 338 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 339
 340 /* To use the struct hack with N elements, declare the struct like this:
 341      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 342    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 343    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 344 #ifdef __IBMC__
 345 # define FLEXIBLE_ARRAY_MEMBER 1
 346 #else
 347 # define FLEXIBLE_ARRAY_MEMBER
 348 #endif
 349
 350 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 351 #ifdef lint
 352 /* Use CODE only if lint checking is in effect.  */
 353 # define IF_LINT(Code) Code
 354 #else
 355 # define IF_LINT(Code) /* empty */
 356 #endif
 357
 358 /* conf_post.h ends here */