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 /* 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 /* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use
  84    gmalloc before dumping and the system malloc after dumping.
  85    hybrid_malloc and friends, defined in gmalloc.c, are wrappers that
  86    accomplish this.  */
  87 #ifdef HYBRID_MALLOC
  88 #ifdef emacs
  89 #define malloc hybrid_malloc
  90 #define realloc hybrid_realloc
  91 #define calloc hybrid_calloc
  92 #define free hybrid_free
  93 #if defined HAVE_GET_CURRENT_DIR_NAME && !defined BROKEN_GET_CURRENT_DIR_NAME
  94 #define HYBRID_GET_CURRENT_DIR_NAME 1
  95 #define get_current_dir_name hybrid_get_current_dir_name
  96 #endif
  97 #endif
  98 #endif  /* HYBRID_MALLOC */
  99
 100 /* We have to go this route, rather than the old hpux9 approach of
 101    renaming the functions via macros.  The system's stdlib.h has fully
 102    prototyped declarations, which yields a conflicting definition of
 103    srand48; it tries to redeclare what was once srandom to be srand48.
 104    So we go with HAVE_LRAND48 being defined.  */
 105 #ifdef HPUX
 106 #undef srandom
 107 #undef random
 108 #undef HAVE_RANDOM
 109 #undef HAVE_RINT
 110 #endif  /* HPUX */
 111
 112 #ifdef IRIX6_5
 113 #ifdef emacs
 114 char *_getpty();
 115 #endif
 116 #define INET6 /* Needed for struct sockaddr_in6.  */
 117 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 118 #endif /* IRIX6_5 */
 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 #endif
 138
 139 /* We must intercept 'opendir' calls to stash away the directory name,
 140    so we could reuse it in readlinkat; see msdos.c.  */
 141 #define opendir sys_opendir
 142
 143 /* End of gnulib-related stuff.  */
 144
 145 #define emacs_raise(sig) msdos_fatal_signal (sig)
 146
 147 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 148 #define DATA_START (&etext + 1)
 149
 150 /* Define one of these for easier conditionals.  */
 151 #ifdef HAVE_X_WINDOWS
 152 /* We need a little extra space, see ../../lisp/loadup.el and the
 153    commentary below, in the non-X branch.  The 140KB number was
 154    measured on GNU/Linux and on MS-Windows.  */
 155 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 156 #else
 157 /* We need a little extra space, see ../../lisp/loadup.el.
 158    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 159    overall, we end up wasting 130KB of pure space, because
 160    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 161    non-DOS specific files and load history; the latter is about 55K,
 162    but depends on the depth of the top-level Emacs directory in the
 163    directory tree).  Given the unknown policy of different DPMI
 164    hosts regarding loading of untouched pages, I'm not going to risk
 165    enlarging Emacs footprint by another 100+ KBytes.  */
 166 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 167 #endif
 168 #endif  /* MSDOS */
 169
 170 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 171    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 172 #ifdef HAVE_NS
 173 #if defined NS_IMPL_GNUSTEP
 174 #  define SYSTEM_PURESIZE_EXTRA 30000
 175 #elif defined DARWIN_OS
 176 #  define SYSTEM_PURESIZE_EXTRA 200000
 177 #endif
 178 #endif
 179
 180 #ifdef CYGWIN
 181 #define SYSTEM_PURESIZE_EXTRA 10000
 182 #endif
 183
 184 #if defined HAVE_NTGUI && !defined DebPrint
 185 # ifdef EMACSDEBUG
 186 extern void _DebPrint (const char *fmt, ...);
 187 #  define DebPrint(stuff) _DebPrint stuff
 188 # else
 189 #  define DebPrint(stuff)
 190 # endif
 191 #endif
 192
 193 #if defined CYGWIN && defined HAVE_NTGUI
 194 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 195 # define _WIN32_WINNT 0x500 /* Win2k */
 196 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 197 #ifndef strnicmp
 198 #define strnicmp strncasecmp
 199 #endif
 200 #endif
 201
 202 #ifdef emacs /* Don't do this for lib-src.  */
 203 /* Tell regex.c to use a type compatible with Emacs.  */
 204 #define RE_TRANSLATE_TYPE Lisp_Object
 205 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 206 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 207 #endif
 208
 209 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 210    Only Emacs uses time_rz so this is OK.  */
 211 #define getenv_TZ emacs_getenv_TZ
 212 #define setenv_TZ emacs_setenv_TZ
 213 extern char *emacs_getenv_TZ (void);
 214 extern int emacs_setenv_TZ (char const *);
 215
 216 #include <string.h>
 217 #include <stdlib.h>
 218
 219 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 220 #define NO_INLINE __attribute__((noinline))
 221 #else
 222 #define NO_INLINE
 223 #endif
 224
 225 #if (__clang__                                                          \
 226      ? __has_attribute (externally_visible)                             \
 227      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 228 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 229 #else
 230 #define EXTERNALLY_VISIBLE
 231 #endif
 232
 233 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 234 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 235 #else
 236 # define ATTRIBUTE_FORMAT(spec) /* empty */
 237 #endif
 238
 239 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 240 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 241    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 242 #else
 243 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 244    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 245 #endif
 246
 247 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 248 #define ATTRIBUTE_UNUSED _GL_UNUSED
 249
 250 #if 3 <= __GNUC__
 251 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 252 #else
 253 # define ATTRIBUTE_MALLOC
 254 #endif
 255
 256 #if (__clang__                                  \
 257      ? __has_attribute (alloc_size)             \
 258      : 4 < __GNUC__ + (3 <= __GNUC_MINOR__))
 259 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 260 #else
 261 # define ATTRIBUTE_ALLOC_SIZE(args)
 262 #endif
 263
 264 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 265
 266 /* Work around GCC bug 59600: when a function is inlined, the inlined
 267    code may have its addresses sanitized even if the function has the
 268    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 269    clang 3.4.  */
 270 #if (! ADDRESS_SANITIZER \
 271      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 272          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 273 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 274 #else
 275 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 276 #endif
 277
 278 /* Attribute of functions whose code should not have addresses
 279    sanitized.  */
 280
 281 #if (__has_attribute (no_sanitize_address) \
 282      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 283 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 284     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 285 #elif __has_attribute (no_address_safety_analysis)
 286 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 287     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 288 #else
 289 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 290 #endif
 291
 292 /* Some versions of GNU/Linux define noinline in their headers.  */
 293 #ifdef noinline
 294 #undef noinline
 295 #endif
 296
 297 /* Use Gnulib's extern-inline module for extern inline functions.
 298    An include file foo.h should prepend FOO_INLINE to function
 299    definitions, with the following overall pattern:
 300
 301       [#include any other .h files first.]
 302       ...
 303       INLINE_HEADER_BEGIN
 304       ...
 305       INLINE int
 306       incr (int i)
 307       {
 308         return i + 1;
 309       }
 310       ...
 311       INLINE_HEADER_END
 312
 313    For every executable, exactly one file that includes the header
 314    should do this:
 315
 316       #define INLINE EXTERN_INLINE
 317
 318    before including config.h or any other .h file.
 319    Other .c files should not define INLINE.
 320    For Emacs, this is done by having emacs.c first '#define INLINE
 321    EXTERN_INLINE' and then include every .h file that uses INLINE.
 322
 323    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 324    warnings in some GCC versions; see ../m4/extern-inline.m4.
 325
 326    C99 compilers compile functions like 'incr' as C99-style extern
 327    inline functions.  Buggy GCC implementations do something similar with
 328    GNU-specific keywords.  Buggy non-GCC compilers use static
 329    functions, which bloats the code but is good enough.  */
 330
 331 #ifndef INLINE
 332 # define INLINE _GL_INLINE
 333 #endif
 334 #define EXTERN_INLINE _GL_EXTERN_INLINE
 335 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 336 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 337
 338 /* To use the struct hack with N elements, declare the struct like this:
 339      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 340    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 341    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 342 #ifdef __IBMC__
 343 # define FLEXIBLE_ARRAY_MEMBER 1
 344 #else
 345 # define FLEXIBLE_ARRAY_MEMBER
 346 #endif
 347
 348 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 349 #ifdef lint
 350 /* Use CODE only if lint checking is in effect.  */
 351 # define IF_LINT(Code) Code
 352 #else
 353 # define IF_LINT(Code) /* empty */
 354 #endif
 355
 356 /* conf_post.h ends here */