/* conf_post.h --- configure.ac includes this via AH_BOTTOM

Copyright (C) 1988, 1993-1994, 1999-2002, 2004-2020 Free Software
Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */

/* Put the code here rather than in configure.ac using AH_BOTTOM.
   This way, the code does not get processed by autoheader.  For
   example, undefs here are not commented out.  */

/* Disable 'assert' unless enabling checking.  Do this early, in
   case some misguided implementation depends on NDEBUG in some
   include file other than assert.h.  */
#if !defined ENABLE_CHECKING && !defined NDEBUG
# define NDEBUG
#endif

/* To help make dependencies clearer elsewhere, this file typically
   does not #include other files.  The exceptions are stdbool.h
   because it is unlikely to interfere with configuration and bool is
   such a core part of the C language, attribute.h because its
   ATTRIBUTE_* macros are used here, and ms-w32.h (DOS_NT
   only) because it historically was included here and changing that
   would take some work.  */

#include <stdbool.h>
#include <attribute.h>

#if defined WINDOWSNT && !defined DEFER_MS_W32_H
# include <ms-w32.h>
#endif

/* GNUC_PREREQ (V, W, X) is true if this is GNU C version V.W.X or later.
   It can be used in a preprocessor expression.  */
#ifndef __GNUC_MINOR__
# define GNUC_PREREQ(v, w, x) false
#elif ! defined __GNUC_PATCHLEVEL__
# define GNUC_PREREQ(v, w, x) \
    ((v) < __GNUC__ + ((w) < __GNUC_MINOR__ + ((x) == 0))
#else
# define GNUC_PREREQ(v, w, x) \
    ((v) < __GNUC__ + ((w) < __GNUC_MINOR__ + ((x) <= __GNUC_PATCHLEVEL__)))
#endif

/* The type of bool bitfields.  Needed to compile Objective-C with
   standard GCC, and to make sure adjacent bool_bf fields are packed
   into the same 1-, 2-, or 4-byte allocation unit in the MinGW
   builds.  It was also needed to port to pre-C99 compilers, although
   we don't care about that any more.  */
#if NS_IMPL_GNUSTEP || defined __MINGW32__
typedef unsigned int bool_bf;
#else
typedef bool bool_bf;
#endif

/* A substitute for __has_attribute on compilers that lack it.
   It is used only on arguments like cleanup that are handled here.
   This macro should be used only in #if expressions, as Oracle
   Studio 12.5's __has_attribute does not work in plain code.  */
#ifdef __has_attribute
# define HAS_ATTRIBUTE(a) __has_attribute (__##a##__)
#else
# define HAS_ATTRIBUTE(a) HAS_ATTR_##a
# define HAS_ATTR_cleanup GNUC_PREREQ (3, 4, 0)
# define HAS_ATTR_no_address_safety_analysis false
# define HAS_ATTR_no_sanitize false
# define HAS_ATTR_no_sanitize_address GNUC_PREREQ (4, 8, 0)
# define HAS_ATTR_no_sanitize_undefined GNUC_PREREQ (4, 9, 0)
#endif

/* A substitute for __has_feature on compilers that lack it.  It is used only
   to define ADDRESS_SANITIZER below.  */
#ifdef __has_feature
# define HAS_FEATURE(a) __has_feature (a)
#else
# define HAS_FEATURE(a) false
#endif

/* True if addresses are being sanitized.  */
#if defined __SANITIZE_ADDRESS__ || HAS_FEATURE (address_sanitizer)
# define ADDRESS_SANITIZER true
#else
# define ADDRESS_SANITIZER false
#endif

#if defined DARWIN_OS && defined emacs && defined HAVE_UNEXEC
# define malloc unexec_malloc
# define realloc unexec_realloc
# define free unexec_free
#endif

/* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use
   gmalloc before dumping and the system malloc after dumping.
   hybrid_malloc and friends, defined in gmalloc.c, are wrappers that
   accomplish this.  */
#ifdef HYBRID_MALLOC
#ifdef emacs
#define malloc hybrid_malloc
#define realloc hybrid_realloc
#define aligned_alloc hybrid_aligned_alloc
#define calloc hybrid_calloc
#define free hybrid_free
#endif
#endif	/* HYBRID_MALLOC */

/* We have to go this route, rather than the old hpux9 approach of
   renaming the functions via macros.  The system's stdlib.h has fully
   prototyped declarations, which yields a conflicting definition of
   srand48; it tries to redeclare what was once srandom to be srand48.
   So we go with HAVE_LRAND48 being defined.  */
#ifdef HPUX
#undef srandom
#undef random
#undef HAVE_RANDOM
#undef HAVE_RINT
#endif  /* HPUX */

#ifdef MSDOS
#ifndef __DJGPP__
You lose; /* Emacs for DOS must be compiled with DJGPP */
#endif
#define _NAIVE_DOS_REGS

/* Start of gnulib-related stuff  */

/* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
   2.03 has it, but it also has _strtold as a stub that jumps to
   strtold, so use _strtold in all versions.  */
#define strtold _strtold

#if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
# define HAVE_LSTAT 1
#else
# define lstat stat
/* DJGPP 2.03 and older don't have the next two.  */
# define EOVERFLOW ERANGE
# define SIZE_MAX  4294967295U
#endif

/* We must intercept 'opendir' calls to stash away the directory name,
   so we could reuse it in readlinkat; see msdos.c.  */
#define opendir sys_opendir

/* End of gnulib-related stuff.  */

#define emacs_raise(sig) msdos_fatal_signal (sig)

/* DATA_START is needed by vm-limit.c and unexcoff.c. */
#define DATA_START (&etext + 1)
#endif  /* MSDOS */

#if defined HAVE_NTGUI && !defined DebPrint
# ifdef EMACSDEBUG
extern void _DebPrint (const char *fmt, ...);
#  define DebPrint(stuff) _DebPrint stuff
# else
#  define DebPrint(stuff) ((void) 0)
# endif
#endif

#if defined CYGWIN && defined HAVE_NTGUI
# define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
# define _WIN32_WINNT 0x500 /* Win2k */
/* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
#ifndef strnicmp
#define strnicmp strncasecmp
#endif
#endif

#ifdef emacs /* Don't do this for lib-src.  */
/* Tell regex.c to use a type compatible with Emacs.  */
#define RE_TRANSLATE_TYPE Lisp_Object
#define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
#define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_fixnum (0)))
#endif

/* Tell time_rz.c to use Emacs's getter and setter for TZ.
   Only Emacs uses time_rz so this is OK.  */
#define getenv_TZ emacs_getenv_TZ
#define setenv_TZ emacs_setenv_TZ
extern char *emacs_getenv_TZ (void);
extern int emacs_setenv_TZ (char const *);

#define NO_INLINE ATTRIBUTE_NOINLINE
#define EXTERNALLY_VISIBLE ATTRIBUTE_EXTERNALLY_VISIBLE

#if GNUC_PREREQ (4, 4, 0) && defined __GLIBC_MINOR__
# define PRINTF_ARCHETYPE __gnu_printf__
#elif GNUC_PREREQ (4, 4, 0) && defined __MINGW32__
# ifdef MINGW_W64
/* When __USE_MINGW_ANSI_STDIO is non-zero (as set by config.h),
   MinGW64 replaces printf* with its own versions that are
   __gnu_printf__ compatible, and emits warnings for MS native %I64d
   format spec.  */
#  if __USE_MINGW_ANSI_STDIO
#   define PRINTF_ARCHETYPE __gnu_printf__
#  else
#   define PRINTF_ARCHETYPE __ms_printf__
#  endif
# else	/* mingw.org's MinGW */
/* Starting from runtime v5.0.0, mingw.org's MinGW with GCC 6 and
   later turns on __USE_MINGW_ANSI_STDIO by default, replaces printf*
   with its own __mingw_printf__ version, which still recognizes
   %I64d.  */
#  if GNUC_PREREQ (6, 0, 0) && __MINGW32_MAJOR_VERSION >= 5
#   define PRINTF_ARCHETYPE __mingw_printf__
#  else  /* __MINGW32_MAJOR_VERSION < 5 */
#   define PRINTF_ARCHETYPE __ms_printf__
#  endif  /* __MINGW32_MAJOR_VERSION < 5 */
# endif	 /* MinGW */
#else
# define PRINTF_ARCHETYPE __printf__
#endif
#define ATTRIBUTE_FORMAT_PRINTF(string_index, first_to_check) \
  ATTRIBUTE_FORMAT ((PRINTF_ARCHETYPE, string_index, first_to_check))

#define ARG_NONNULL ATTRIBUTE_NONNULL
#define ATTRIBUTE_UNUSED MAYBE_UNUSED

/* Declare NAME to be a pointer to an object of type TYPE, initialized
   to the address ADDR, which may be of a different type.  Accesses
   via NAME may alias with other accesses with the traditional
   behavior, even if options like gcc -fstrict-aliasing are used.  */

#define DECLARE_POINTER_ALIAS(name, type, addr) \
  type ATTRIBUTE_MAY_ALIAS *name = (type *) (addr)

#if 3 <= __GNUC__
# define ATTRIBUTE_SECTION(name) __attribute__((section (name)))
#else
#define ATTRIBUTE_SECTION(name)
#endif

#define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)

/* Work around GCC bug 59600: when a function is inlined, the inlined
   code may have its addresses sanitized even if the function has the
   no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
   clang 3.4.  */
#if (! ADDRESS_SANITIZER \
     || (GNUC_PREREQ (4, 9, 0) \
	 || 3 < __clang_major__ + (4 <= __clang_minor__)))
# define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
#else
# define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
#endif

/* Attribute of functions whose code should not have addresses
   sanitized.  */

#if HAS_ATTRIBUTE (no_sanitize_address)
# define ATTRIBUTE_NO_SANITIZE_ADDRESS \
    __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
#elif HAS_ATTRIBUTE (no_address_safety_analysis)
# define ATTRIBUTE_NO_SANITIZE_ADDRESS \
    __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
#else
# define ATTRIBUTE_NO_SANITIZE_ADDRESS
#endif

/* Attribute of functions whose undefined behavior should not be sanitized.  */

#if HAS_ATTRIBUTE (no_sanitize_undefined)
# define ATTRIBUTE_NO_SANITIZE_UNDEFINED __attribute__ ((no_sanitize_undefined))
#elif HAS_ATTRIBUTE (no_sanitize)
# define ATTRIBUTE_NO_SANITIZE_UNDEFINED \
    __attribute__ ((no_sanitize ("undefined")))
#else
# define ATTRIBUTE_NO_SANITIZE_UNDEFINED
#endif

/* gcc -fsanitize=address does not work with vfork in Fedora 28 x86-64.  See:
   https://lists.gnu.org/r/emacs-devel/2017-05/msg00464.html
   For now, assume that this problem occurs on all platforms.  */
#if ADDRESS_SANITIZER && !defined vfork
# define vfork fork
#endif

#if ! (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__)
# undef PROFILING
#endif

/* Some versions of GNU/Linux define noinline in their headers.  */
#ifdef noinline
#undef noinline
#endif

/* INLINE marks functions defined in Emacs-internal C headers.
   INLINE is implemented via C99-style 'extern inline' if Emacs is built
   with -DEMACS_EXTERN_INLINE; otherwise it is implemented via 'static'.
   EMACS_EXTERN_INLINE is no longer the default, as 'static' seems to
   have better performance with GCC.

   An include file foo.h should prepend INLINE to function
   definitions, with the following overall pattern:

      [#include any other .h files first.]
      ...
      INLINE_HEADER_BEGIN
      ...
      INLINE int
      incr (int i)
      {
        return i + 1;
      }
      ...
      INLINE_HEADER_END

   For every executable, exactly one file that includes the header
   should do this:

      #define INLINE EXTERN_INLINE

   before including config.h or any other .h file.
   Other .c files should not define INLINE.
   For Emacs, this is done by having emacs.c first '#define INLINE
   EXTERN_INLINE' and then include every .h file that uses INLINE.

   The INLINE_HEADER_BEGIN and INLINE_HEADER_END macros suppress bogus
   warnings in some GCC versions; see ../m4/extern-inline.m4.  */

#ifdef EMACS_EXTERN_INLINE

/* Use Gnulib's extern-inline module for extern inline functions.

   C99 compilers compile functions like 'incr' as C99-style extern
   inline functions.  Buggy GCC implementations do something similar with
   GNU-specific keywords.  Buggy non-GCC compilers use static
   functions, which bloats the code but is good enough.  */

# ifndef INLINE
#  define INLINE _GL_INLINE
# endif
# define EXTERN_INLINE _GL_EXTERN_INLINE
# define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
# define INLINE_HEADER_END _GL_INLINE_HEADER_END

#else

/* Use 'static inline' instead of 'extern inline' because 'static inline'
   has much better performance for Emacs when compiled with 'gcc -Og'.  */

# ifndef INLINE
#  define INLINE EXTERN_INLINE
# endif
# define EXTERN_INLINE static inline
# define INLINE_HEADER_BEGIN
# define INLINE_HEADER_END

#endif

/* 'int x UNINIT;' is equivalent to 'int x;', except it cajoles GCC
   into not warning incorrectly about use of an uninitialized variable.  */
#if defined GCC_LINT || defined lint
# define UNINIT = {0,}
#else
# define UNINIT /* empty */
#endif