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