lib/libc-config.h

   1 /* System definitions for code taken from the GNU C Library
   2
   3    Copyright 2017-2024 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with this program; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* Written by Paul Eggert.  */
  20
  21 /* This is intended to be a good-enough substitute for glibc system
  22    macros like those defined in <sys/cdefs.h>, so that Gnulib code
  23    shared with glibc can do this as the first #include:
  24
  25      #ifndef _LIBC
  26      # include <libc-config.h>
  27      #endif
  28
  29    When compiled as part of glibc this is a no-op; when compiled as
  30    part of Gnulib this includes Gnulib's <config.h> and defines macros
  31    that glibc library code would normally assume.
  32
  33    Note: This header file MUST NOT be included by public header files
  34    of Gnulib.  */
  35
  36 #include <config.h>
  37
  38 /* On glibc this includes <features.h> and <sys/cdefs.h> and #defines
  39    _FEATURES_H, __WORDSIZE, and __set_errno.  On FreeBSD 11 and
  40    DragonFlyBSD 5.9 it includes <sys/cdefs.h> which defines __nonnull.
  41    Elsewhere it is harmless.  */
  42 #include <errno.h>
  43
  44 /* From glibc <errno.h>.  */
  45 #ifndef __set_errno
  46 # define __set_errno(val) (errno = (val))
  47 #endif
  48
  49 /* From glibc <features.h>.  */
  50
  51 #ifndef __GNUC_PREREQ
  52 # if defined __GNUC__ && defined __GNUC_MINOR__
  53 #  define __GNUC_PREREQ(maj, min) ((maj) < __GNUC__ + ((min) <= __GNUC_MINOR__))
  54 # else
  55 #  define __GNUC_PREREQ(maj, min) 0
  56 # endif
  57 #endif
  58
  59 #ifndef __glibc_clang_prereq
  60 # if defined __clang_major__ && defined __clang_minor__
  61 #  ifdef __apple_build_version__
  62 /* Apple for some reason renumbers __clang_major__ and __clang_minor__.
  63    Gnulib code uses only __glibc_clang_prereq (3, 5); map it to
  64    6000000 <= __apple_build_version__.  Support for other calls to
  65    __glibc_clang_prereq can be added here as needed.  */
  66 #   define __glibc_clang_prereq(maj, min) \
  67       ((maj) == 3 && (min) == 5 ? 6000000 <= __apple_build_version__ : 0)
  68 #  else
  69 #   define __glibc_clang_prereq(maj, min) \
  70       ((maj) < __clang_major__ + ((min) <= __clang_minor__))
  71 #  endif
  72 # else
  73 #  define __glibc_clang_prereq(maj, min) 0
  74 # endif
  75 #endif
  76
  77 #ifndef __attribute_nonnull__
  78 /* <sys/cdefs.h> either does not exist, or is too old for Gnulib.
  79    Prepare to include <cdefs.h>, which is Gnulib's version of a
  80    more-recent glibc <sys/cdefs.h>.  */
  81
  82 /* Define _FEATURES_H so that <cdefs.h> does not include <features.h>.  */
  83 # ifndef _FEATURES_H
  84 #  define _FEATURES_H 1
  85 # endif
  86 /* Define __GNULIB_CDEFS so that <cdefs.h> does not attempt to include
  87    nonexistent files.  */
  88 # define __GNULIB_CDEFS
  89 /* Undef the macros unconditionally defined by our copy of glibc
  90    <sys/cdefs.h>, so that they do not clash with any system-defined
  91    versions.  */
  92 # undef _SYS_CDEFS_H
  93 # undef __ASMNAME
  94 # undef __ASMNAME2
  95 # undef __BEGIN_DECLS
  96 # undef __CONCAT
  97 # undef __END_DECLS
  98 # undef __HAVE_GENERIC_SELECTION
  99 # undef __LDBL_COMPAT
 100 # undef __LDBL_REDIR
 101 # undef __LDBL_REDIR1
 102 # undef __LDBL_REDIR1_DECL
 103 # undef __LDBL_REDIR1_NTH
 104 # undef __LDBL_REDIR2_DECL
 105 # undef __LDBL_REDIR_DECL
 106 # undef __LDBL_REDIR_NTH
 107 # undef __LEAF
 108 # undef __LEAF_ATTR
 109 # undef __NTH
 110 # undef __NTHNL
 111 # undef __REDIRECT
 112 # undef __REDIRECT_LDBL
 113 # undef __REDIRECT_NTH
 114 # undef __REDIRECT_NTHNL
 115 # undef __REDIRECT_NTH_LDBL
 116 # undef __STRING
 117 # undef __THROW
 118 # undef __THROWNL
 119 # undef __attr_access
 120 # undef __attr_access_none
 121 # undef __attr_dealloc
 122 # undef __attr_dealloc_free
 123 # undef __attribute__
 124 # undef __attribute_alloc_align__
 125 # undef __attribute_alloc_size__
 126 # undef __attribute_artificial__
 127 # undef __attribute_const__
 128 # undef __attribute_deprecated__
 129 # undef __attribute_deprecated_msg__
 130 # undef __attribute_format_arg__
 131 # undef __attribute_format_strfmon__
 132 # undef __attribute_malloc__
 133 # undef __attribute_maybe_unused__
 134 # undef __attribute_noinline__
 135 # undef __attribute_nonstring__
 136 # undef __attribute_pure__
 137 # undef __attribute_returns_twice__
 138 # undef __attribute_used__
 139 # undef __attribute_warn_unused_result__
 140 # undef __errordecl
 141 # undef __extension__
 142 # undef __extern_always_inline
 143 # undef __extern_inline
 144 # undef __flexarr
 145 # undef __fortified_attr_access
 146 # undef __fortify_function
 147 # undef __glibc_c99_flexarr_available
 148 # undef __glibc_has_attribute
 149 # undef __glibc_has_builtin
 150 # undef __glibc_has_extension
 151 # undef __glibc_likely
 152 # undef __glibc_macro_warning
 153 # undef __glibc_macro_warning1
 154 # undef __glibc_unlikely
 155 # undef __inline
 156 # undef __ptr_t
 157 # undef __restrict
 158 # undef __restrict_arr
 159 # undef __va_arg_pack
 160 # undef __va_arg_pack_len
 161 # undef __warnattr
 162 # undef __wur
 163 # ifndef __GNULIB_CDEFS
 164 #  undef __bos
 165 #  undef __bos0
 166 #  undef __glibc_fortify
 167 #  undef __glibc_fortify_n
 168 #  undef __glibc_objsize
 169 #  undef __glibc_objsize0
 170 #  undef __glibc_safe_len_cond
 171 #  undef __glibc_safe_or_unknown_len
 172 #  undef __glibc_unsafe_len
 173 #  undef __glibc_unsigned_or_positive
 174 # endif
 175
 176 /* Include our copy of glibc <sys/cdefs.h>.  */
 177 # include <cdefs.h>
 178
 179 /* <cdefs.h> __inline is too pessimistic for non-GCC.  */
 180 # undef __inline
 181 # ifndef HAVE___INLINE
 182 #  if 199901 <= __STDC_VERSION__ || defined inline
 183 #   define __inline inline
 184 #  else
 185 #   define __inline
 186 #  endif
 187 # endif
 188
 189 #endif /* defined __glibc_likely */
 190
 191
 192 /* A substitute for glibc <libc-symbols.h>, good enough for Gnulib.  */
 193 #define attribute_hidden
 194 #define libc_hidden_proto(name)
 195 #define libc_hidden_def(name)
 196 #define libc_hidden_weak(name)
 197 #define libc_hidden_ver(local, name)
 198 #define strong_alias(name, aliasname)
 199 #define weak_alias(name, aliasname)
 200
 201 /* A substitute for glibc <shlib-compat.h>, good enough for Gnulib.  */
 202 #define SHLIB_COMPAT(lib, introduced, obsoleted) 0
 203 #define compat_symbol(lib, local, symbol, version) extern int dummy
 204 #define versioned_symbol(lib, local, symbol, version) extern int dummy