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_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 calloc hybrid_calloc
 104 #define free hybrid_free
 105 #endif
 106 #endif  /* HYBRID_MALLOC */
 107
 108 /* We have to go this route, rather than the old hpux9 approach of
 109    renaming the functions via macros.  The system's stdlib.h has fully
 110    prototyped declarations, which yields a conflicting definition of
 111    srand48; it tries to redeclare what was once srandom to be srand48.
 112    So we go with HAVE_LRAND48 being defined.  */
 113 #ifdef HPUX
 114 #undef srandom
 115 #undef random
 116 #undef HAVE_RANDOM
 117 #undef HAVE_RINT
 118 #endif  /* HPUX */
 119
 120 #ifdef MSDOS
 121 #ifndef __DJGPP__
 122 You lose; /* Emacs for DOS must be compiled with DJGPP */
 123 #endif
 124 #define _NAIVE_DOS_REGS
 125
 126 /* Start of gnulib-related stuff  */
 127
 128 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 129    2.03 has it, but it also has _strtold as a stub that jumps to
 130    strtold, so use _strtold in all versions.  */
 131 #define strtold _strtold
 132
 133 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 134 # define HAVE_LSTAT 1
 135 #else
 136 # define lstat stat
 137 /* DJGPP 2.03 and older don't have the next two.  */
 138 # define EOVERFLOW ERANGE
 139 # define SIZE_MAX  4294967295U
 140 #endif
 141
 142 /* We must intercept 'opendir' calls to stash away the directory name,
 143    so we could reuse it in readlinkat; see msdos.c.  */
 144 #define opendir sys_opendir
 145
 146 /* End of gnulib-related stuff.  */
 147
 148 #define emacs_raise(sig) msdos_fatal_signal (sig)
 149
 150 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 151 #define DATA_START (&etext + 1)
 152
 153 /* Define one of these for easier conditionals.  */
 154 #ifdef HAVE_X_WINDOWS
 155 /* We need a little extra space, see ../../lisp/loadup.el and the
 156    commentary below, in the non-X branch.  The 140KB number was
 157    measured on GNU/Linux and on MS-Windows.  */
 158 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 159 #else
 160 /* We need a little extra space, see ../../lisp/loadup.el.
 161    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 162    overall, we end up wasting 130KB of pure space, because
 163    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 164    non-DOS specific files and load history; the latter is about 55K,
 165    but depends on the depth of the top-level Emacs directory in the
 166    directory tree).  Given the unknown policy of different DPMI
 167    hosts regarding loading of untouched pages, I'm not going to risk
 168    enlarging Emacs footprint by another 100+ KBytes.  */
 169 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 170 #endif
 171 #endif  /* MSDOS */
 172
 173 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 174    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 175 #ifdef HAVE_NS
 176 #if defined NS_IMPL_GNUSTEP
 177 #  define SYSTEM_PURESIZE_EXTRA 30000
 178 #elif defined DARWIN_OS
 179 #  define SYSTEM_PURESIZE_EXTRA 200000
 180 #endif
 181 #endif
 182
 183 #ifdef CYGWIN
 184 #define SYSTEM_PURESIZE_EXTRA 50000
 185 #endif
 186
 187 #if defined HAVE_NTGUI && !defined DebPrint
 188 # ifdef EMACSDEBUG
 189 extern void _DebPrint (const char *fmt, ...);
 190 #  define DebPrint(stuff) _DebPrint stuff
 191 # else
 192 #  define DebPrint(stuff)
 193 # endif
 194 #endif
 195
 196 #if defined CYGWIN && defined HAVE_NTGUI
 197 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 198 # define _WIN32_WINNT 0x500 /* Win2k */
 199 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 200 #ifndef strnicmp
 201 #define strnicmp strncasecmp
 202 #endif
 203 #endif
 204
 205 #ifdef emacs /* Don't do this for lib-src.  */
 206 /* Tell regex.c to use a type compatible with Emacs.  */
 207 #define RE_TRANSLATE_TYPE Lisp_Object
 208 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 209 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 210 #endif
 211
 212 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 213    Only Emacs uses time_rz so this is OK.  */
 214 #define getenv_TZ emacs_getenv_TZ
 215 #define setenv_TZ emacs_setenv_TZ
 216 extern char *emacs_getenv_TZ (void);
 217 extern int emacs_setenv_TZ (char const *);
 218
 219 #include <string.h>
 220 #include <stdlib.h>
 221
 222 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 223 #define NO_INLINE __attribute__((noinline))
 224 #else
 225 #define NO_INLINE
 226 #endif
 227
 228 #if __has_attribute (externally_visible)
 229 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 230 #else
 231 #define EXTERNALLY_VISIBLE
 232 #endif
 233
 234 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 235 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 236 #else
 237 # define ATTRIBUTE_FORMAT(spec) /* empty */
 238 #endif
 239
 240 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 241 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 242    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 243 #else
 244 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 245    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 246 #endif
 247
 248 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 249 #define ATTRIBUTE_UNUSED _GL_UNUSED
 250
 251 #if 3 <= __GNUC__
 252 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 253 #else
 254 # define ATTRIBUTE_MALLOC
 255 #endif
 256
 257 #if __has_attribute (alloc_size)
 258 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 259 #else
 260 # define ATTRIBUTE_ALLOC_SIZE(args)
 261 #endif
 262
 263 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 264
 265 /* Work around GCC bug 59600: when a function is inlined, the inlined
 266    code may have its addresses sanitized even if the function has the
 267    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 268    clang 3.4.  */
 269 #if (! ADDRESS_SANITIZER \
 270      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 271          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 272 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 273 #else
 274 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 275 #endif
 276
 277 /* Attribute of functions whose code should not have addresses
 278    sanitized.  */
 279
 280 #if __has_attribute (no_sanitize_address)
 281 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 282     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 283 #elif __has_attribute (no_address_safety_analysis)
 284 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 285     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 286 #else
 287 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 288 #endif
 289
 290 /* Some versions of GNU/Linux define noinline in their headers.  */
 291 #ifdef noinline
 292 #undef noinline
 293 #endif
 294
 295 /* Use Gnulib's extern-inline module for extern inline functions.
 296    An include file foo.h should prepend FOO_INLINE to function
 297    definitions, with the following overall pattern:
 298
 299       [#include any other .h files first.]
 300       ...
 301       INLINE_HEADER_BEGIN
 302       ...
 303       INLINE int
 304       incr (int i)
 305       {
 306         return i + 1;
 307       }
 308       ...
 309       INLINE_HEADER_END
 310
 311    For every executable, exactly one file that includes the header
 312    should do this:
 313
 314       #define INLINE EXTERN_INLINE
 315
 316    before including config.h or any other .h file.
 317    Other .c files should not define INLINE.
 318    For Emacs, this is done by having emacs.c first '#define INLINE
 319    EXTERN_INLINE' and then include every .h file that uses INLINE.
 320
 321    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 322    warnings in some GCC versions; see ../m4/extern-inline.m4.
 323
 324    C99 compilers compile functions like 'incr' as C99-style extern
 325    inline functions.  Buggy GCC implementations do something similar with
 326    GNU-specific keywords.  Buggy non-GCC compilers use static
 327    functions, which bloats the code but is good enough.  */
 328
 329 #ifndef INLINE
 330 # define INLINE _GL_INLINE
 331 #endif
 332 #define EXTERN_INLINE _GL_EXTERN_INLINE
 333 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 334 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 335
 336 /* To use the struct hack with N elements, declare the struct like this:
 337      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 338    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 339    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 340 #ifdef __IBMC__
 341 # define FLEXIBLE_ARRAY_MEMBER 1
 342 #else
 343 # define FLEXIBLE_ARRAY_MEMBER
 344 #endif
 345
 346 /* Use CODE only if lint checking is in effect.  */
 347 #if defined GCC_LINT || defined lint
 348 # define IF_LINT(Code) Code
 349 #else
 350 # define IF_LINT(Code) /* empty */
 351 #endif
 352
 353 /* conf_post.h ends here */