src/conf_post.h

   1 /* conf_post.h --- configure.ac includes this via AH_BOTTOM
   2
   3 Copyright (C) 1988, 1993-1994, 1999-2002, 2004-2014 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 #endif
 197
 198 #ifdef emacs /* Don't do this for lib-src.  */
 199 /* Tell regex.c to use a type compatible with Emacs.  */
 200 #define RE_TRANSLATE_TYPE Lisp_Object
 201 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 202 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 203 #endif
 204
 205 #include <string.h>
 206 #include <stdlib.h>
 207
 208 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 209 #define NO_INLINE __attribute__((noinline))
 210 #else
 211 #define NO_INLINE
 212 #endif
 213
 214 #if (__clang__                                                          \
 215      ? __has_attribute (externally_visible)                             \
 216      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 217 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 218 #else
 219 #define EXTERNALLY_VISIBLE
 220 #endif
 221
 222 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 223 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 224 #else
 225 # define ATTRIBUTE_FORMAT(spec) /* empty */
 226 #endif
 227
 228 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 229 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 230    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 231 #else
 232 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 233    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 234 #endif
 235
 236 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 237
 238 #if 3 <= __GNUC__
 239 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 240 #else
 241 # define ATTRIBUTE_MALLOC
 242 #endif
 243
 244 #if 4 < __GNUC__ + (3 <= __GNUC_MINOR__)
 245 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 246 #else
 247 # define ATTRIBUTE_ALLOC_SIZE(args)
 248 #endif
 249
 250 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 251
 252 /* Work around GCC bug 59600: when a function is inlined, the inlined
 253    code may have its addresses sanitized even if the function has the
 254    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 255    clang 3.4.  */
 256 #if (! ADDRESS_SANITIZER \
 257      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 258          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 259 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 260 #else
 261 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 262 #endif
 263
 264 /* Attribute of functions whose code should not have addresses
 265    sanitized.  */
 266
 267 #if (__has_attribute (no_sanitize_address) \
 268      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 269 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 270     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 271 #elif __has_attribute (no_address_safety_analysis)
 272 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 273     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 274 #else
 275 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 276 #endif
 277
 278 /* Some versions of GNU/Linux define noinline in their headers.  */
 279 #ifdef noinline
 280 #undef noinline
 281 #endif
 282
 283 /* Use Gnulib's extern-inline module for extern inline functions.
 284    An include file foo.h should prepend FOO_INLINE to function
 285    definitions, with the following overall pattern:
 286
 287       [#include any other .h files first.]
 288       ...
 289       INLINE_HEADER_BEGIN
 290       ...
 291       INLINE int
 292       incr (int i)
 293       {
 294         return i + 1;
 295       }
 296       ...
 297       INLINE_HEADER_END
 298
 299    For every executable, exactly one file that includes the header
 300    should do this:
 301
 302       #define INLINE EXTERN_INLINE
 303
 304    before including config.h or any other .h file.
 305    Other .c files should not define INLINE.
 306
 307    C99 compilers compile functions like 'incr' as C99-style extern
 308    inline functions.  Pre-C99 GCCs do something similar with
 309    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 310    functions, which bloats the code but is good enough.  */
 311
 312 #ifndef INLINE
 313 # define INLINE _GL_INLINE
 314 #endif
 315 #define EXTERN_INLINE _GL_EXTERN_INLINE
 316 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 317 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 318
 319 /* To use the struct hack with N elements, declare the struct like this:
 320      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 321    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 322    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 323 #ifdef __IBMC__
 324 # define FLEXIBLE_ARRAY_MEMBER 1
 325 #else
 326 # define FLEXIBLE_ARRAY_MEMBER
 327 #endif
 328
 329 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 330 #ifdef lint
 331 /* Use CODE only if lint checking is in effect.  */
 332 # define IF_LINT(Code) Code
 333 #else
 334 # define IF_LINT(Code) /* empty */
 335 #endif
 336
 337 /* conf_post.h ends here */