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 calloc hybrid_calloc
 103 #define free hybrid_free
 104 #if defined HAVE_GET_CURRENT_DIR_NAME && !defined BROKEN_GET_CURRENT_DIR_NAME
 105 #define HYBRID_GET_CURRENT_DIR_NAME 1
 106 #define get_current_dir_name hybrid_get_current_dir_name
 107 #endif
 108 #endif
 109 #endif  /* HYBRID_MALLOC */
 110
 111 /* We have to go this route, rather than the old hpux9 approach of
 112    renaming the functions via macros.  The system's stdlib.h has fully
 113    prototyped declarations, which yields a conflicting definition of
 114    srand48; it tries to redeclare what was once srandom to be srand48.
 115    So we go with HAVE_LRAND48 being defined.  */
 116 #ifdef HPUX
 117 #undef srandom
 118 #undef random
 119 #undef HAVE_RANDOM
 120 #undef HAVE_RINT
 121 #endif  /* HPUX */
 122
 123 #ifdef IRIX6_5
 124 #ifdef emacs
 125 char *_getpty();
 126 #endif
 127 #define INET6 /* Needed for struct sockaddr_in6.  */
 128 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 129 #endif /* IRIX6_5 */
 130
 131 #ifdef MSDOS
 132 #ifndef __DJGPP__
 133 You lose; /* Emacs for DOS must be compiled with DJGPP */
 134 #endif
 135 #define _NAIVE_DOS_REGS
 136
 137 /* Start of gnulib-related stuff  */
 138
 139 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 140    2.03 has it, but it also has _strtold as a stub that jumps to
 141    strtold, so use _strtold in all versions.  */
 142 #define strtold _strtold
 143
 144 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 145 # define HAVE_LSTAT 1
 146 #else
 147 # define lstat stat
 148 #endif
 149
 150 /* We must intercept 'opendir' calls to stash away the directory name,
 151    so we could reuse it in readlinkat; see msdos.c.  */
 152 #define opendir sys_opendir
 153
 154 /* End of gnulib-related stuff.  */
 155
 156 #define emacs_raise(sig) msdos_fatal_signal (sig)
 157
 158 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 159 #define DATA_START (&etext + 1)
 160
 161 /* Define one of these for easier conditionals.  */
 162 #ifdef HAVE_X_WINDOWS
 163 /* We need a little extra space, see ../../lisp/loadup.el and the
 164    commentary below, in the non-X branch.  The 140KB number was
 165    measured on GNU/Linux and on MS-Windows.  */
 166 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 167 #else
 168 /* We need a little extra space, see ../../lisp/loadup.el.
 169    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 170    overall, we end up wasting 130KB of pure space, because
 171    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 172    non-DOS specific files and load history; the latter is about 55K,
 173    but depends on the depth of the top-level Emacs directory in the
 174    directory tree).  Given the unknown policy of different DPMI
 175    hosts regarding loading of untouched pages, I'm not going to risk
 176    enlarging Emacs footprint by another 100+ KBytes.  */
 177 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 178 #endif
 179 #endif  /* MSDOS */
 180
 181 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 182    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 183 #ifdef HAVE_NS
 184 #if defined NS_IMPL_GNUSTEP
 185 #  define SYSTEM_PURESIZE_EXTRA 30000
 186 #elif defined DARWIN_OS
 187 #  define SYSTEM_PURESIZE_EXTRA 200000
 188 #endif
 189 #endif
 190
 191 #ifdef CYGWIN
 192 #define SYSTEM_PURESIZE_EXTRA 10000
 193 #endif
 194
 195 #if defined HAVE_NTGUI && !defined DebPrint
 196 # ifdef EMACSDEBUG
 197 extern void _DebPrint (const char *fmt, ...);
 198 #  define DebPrint(stuff) _DebPrint stuff
 199 # else
 200 #  define DebPrint(stuff)
 201 # endif
 202 #endif
 203
 204 #if defined CYGWIN && defined HAVE_NTGUI
 205 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 206 # define _WIN32_WINNT 0x500 /* Win2k */
 207 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 208 #ifndef strnicmp
 209 #define strnicmp strncasecmp
 210 #endif
 211 #endif
 212
 213 #ifdef emacs /* Don't do this for lib-src.  */
 214 /* Tell regex.c to use a type compatible with Emacs.  */
 215 #define RE_TRANSLATE_TYPE Lisp_Object
 216 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 217 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 218 #endif
 219
 220 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 221    Only Emacs uses time_rz so this is OK.  */
 222 #define getenv_TZ emacs_getenv_TZ
 223 #define setenv_TZ emacs_setenv_TZ
 224 extern char *emacs_getenv_TZ (void);
 225 extern int emacs_setenv_TZ (char const *);
 226
 227 #include <string.h>
 228 #include <stdlib.h>
 229
 230 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 231 #define NO_INLINE __attribute__((noinline))
 232 #else
 233 #define NO_INLINE
 234 #endif
 235
 236 #if __has_attribute (externally_visible)
 237 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 238 #else
 239 #define EXTERNALLY_VISIBLE
 240 #endif
 241
 242 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 243 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 244 #else
 245 # define ATTRIBUTE_FORMAT(spec) /* empty */
 246 #endif
 247
 248 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 249 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 250    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 251 #else
 252 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 253    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 254 #endif
 255
 256 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 257 #define ATTRIBUTE_UNUSED _GL_UNUSED
 258
 259 #if 3 <= __GNUC__
 260 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 261 #else
 262 # define ATTRIBUTE_MALLOC
 263 #endif
 264
 265 #if __has_attribute (alloc_size)
 266 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 267 #else
 268 # define ATTRIBUTE_ALLOC_SIZE(args)
 269 #endif
 270
 271 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 272
 273 /* Work around GCC bug 59600: when a function is inlined, the inlined
 274    code may have its addresses sanitized even if the function has the
 275    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 276    clang 3.4.  */
 277 #if (! ADDRESS_SANITIZER \
 278      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 279          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 280 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 281 #else
 282 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 283 #endif
 284
 285 /* Attribute of functions whose code should not have addresses
 286    sanitized.  */
 287
 288 #if __has_attribute (no_sanitize_address)
 289 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 290     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 291 #elif __has_attribute (no_address_safety_analysis)
 292 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 293     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 294 #else
 295 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 296 #endif
 297
 298 /* Some versions of GNU/Linux define noinline in their headers.  */
 299 #ifdef noinline
 300 #undef noinline
 301 #endif
 302
 303 /* Use Gnulib's extern-inline module for extern inline functions.
 304    An include file foo.h should prepend FOO_INLINE to function
 305    definitions, with the following overall pattern:
 306
 307       [#include any other .h files first.]
 308       ...
 309       INLINE_HEADER_BEGIN
 310       ...
 311       INLINE int
 312       incr (int i)
 313       {
 314         return i + 1;
 315       }
 316       ...
 317       INLINE_HEADER_END
 318
 319    For every executable, exactly one file that includes the header
 320    should do this:
 321
 322       #define INLINE EXTERN_INLINE
 323
 324    before including config.h or any other .h file.
 325    Other .c files should not define INLINE.
 326    For Emacs, this is done by having emacs.c first '#define INLINE
 327    EXTERN_INLINE' and then include every .h file that uses INLINE.
 328
 329    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 330    warnings in some GCC versions; see ../m4/extern-inline.m4.
 331
 332    C99 compilers compile functions like 'incr' as C99-style extern
 333    inline functions.  Buggy GCC implementations do something similar with
 334    GNU-specific keywords.  Buggy non-GCC compilers use static
 335    functions, which bloats the code but is good enough.  */
 336
 337 #ifndef INLINE
 338 # define INLINE _GL_INLINE
 339 #endif
 340 #define EXTERN_INLINE _GL_EXTERN_INLINE
 341 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 342 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 343
 344 /* To use the struct hack with N elements, declare the struct like this:
 345      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 346    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 347    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 348 #ifdef __IBMC__
 349 # define FLEXIBLE_ARRAY_MEMBER 1
 350 #else
 351 # define FLEXIBLE_ARRAY_MEMBER
 352 #endif
 353
 354 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 355 #ifdef lint
 356 /* Use CODE only if lint checking is in effect.  */
 357 # define IF_LINT(Code) Code
 358 #else
 359 # define IF_LINT(Code) /* empty */
 360 #endif
 361
 362 /* conf_post.h ends here */