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 #if defined __clang__
  52   /* clang really only groks GNU C 4.2, regardless of its value of __GNUC__.  */
  53 # undef __GNUC_PREREQ
  54 # define __GNUC_PREREQ(maj, min) ((maj) < 4 + ((min) <= 2))
  55 #endif
  56 #ifndef __GNUC_PREREQ
  57 # if defined __GNUC__ && defined __GNUC_MINOR__
  58 #  define __GNUC_PREREQ(maj, min) ((maj) < __GNUC__ + ((min) <= __GNUC_MINOR__))
  59 # else
  60 #  define __GNUC_PREREQ(maj, min) 0
  61 # endif
  62 #endif
  63
  64 #ifndef __glibc_clang_prereq
  65 # if defined __clang_major__ && defined __clang_minor__
  66 #  ifdef __apple_build_version__
  67 /* Apple for some reason renumbers __clang_major__ and __clang_minor__.
  68    Gnulib code uses only __glibc_clang_prereq (3, 5); map it to
  69    6000000 <= __apple_build_version__.  Support for other calls to
  70    __glibc_clang_prereq can be added here as needed.  */
  71 #   define __glibc_clang_prereq(maj, min) \
  72       ((maj) == 3 && (min) == 5 ? 6000000 <= __apple_build_version__ : 0)
  73 #  else
  74 #   define __glibc_clang_prereq(maj, min) \
  75       ((maj) < __clang_major__ + ((min) <= __clang_minor__))
  76 #  endif
  77 # else
  78 #  define __glibc_clang_prereq(maj, min) 0
  79 # endif
  80 #endif
  81
  82 #ifndef __attribute_nonnull__
  83 /* <sys/cdefs.h> either does not exist, or is too old for Gnulib.
  84    Prepare to include <cdefs.h>, which is Gnulib's version of a
  85    more-recent glibc <sys/cdefs.h>.  */
  86
  87 /* Define _FEATURES_H so that <cdefs.h> does not include <features.h>.  */
  88 # ifndef _FEATURES_H
  89 #  define _FEATURES_H 1
  90 # endif
  91 /* Define __GNULIB_CDEFS so that <cdefs.h> does not attempt to include
  92    nonexistent files.  */
  93 # define __GNULIB_CDEFS
  94 /* Undef the macros unconditionally defined by our copy of glibc
  95    <sys/cdefs.h>, so that they do not clash with any system-defined
  96    versions.  */
  97 # undef _SYS_CDEFS_H
  98 # undef __ASMNAME
  99 # undef __ASMNAME2
 100 # undef __BEGIN_DECLS
 101 # undef __CONCAT
 102 # undef __END_DECLS
 103 # undef __HAVE_GENERIC_SELECTION
 104 # undef __LDBL_COMPAT
 105 # undef __LDBL_REDIR
 106 # undef __LDBL_REDIR1
 107 # undef __LDBL_REDIR1_DECL
 108 # undef __LDBL_REDIR1_NTH
 109 # undef __LDBL_REDIR2_DECL
 110 # undef __LDBL_REDIR_DECL
 111 # undef __LDBL_REDIR_NTH
 112 # undef __LEAF
 113 # undef __LEAF_ATTR
 114 # undef __NTH
 115 # undef __NTHNL
 116 # undef __REDIRECT
 117 # undef __REDIRECT_LDBL
 118 # undef __REDIRECT_NTH
 119 # undef __REDIRECT_NTHNL
 120 # undef __REDIRECT_NTH_LDBL
 121 # undef __STRING
 122 # undef __THROW
 123 # undef __THROWNL
 124 # undef __attr_access
 125 # undef __attr_access_none
 126 # undef __attr_dealloc
 127 # undef __attr_dealloc_free
 128 # undef __attribute__
 129 # undef __attribute_alloc_align__
 130 # undef __attribute_alloc_size__
 131 # undef __attribute_artificial__
 132 # undef __attribute_const__
 133 # undef __attribute_deprecated__
 134 # undef __attribute_deprecated_msg__
 135 # undef __attribute_format_arg__
 136 # undef __attribute_format_strfmon__
 137 # undef __attribute_malloc__
 138 # undef __attribute_maybe_unused__
 139 # undef __attribute_noinline__
 140 # undef __attribute_nonstring__
 141 # undef __attribute_pure__
 142 # undef __attribute_returns_twice__
 143 # undef __attribute_used__
 144 # undef __attribute_warn_unused_result__
 145 # undef __errordecl
 146 # undef __extension__
 147 # undef __extern_always_inline
 148 # undef __extern_inline
 149 # undef __flexarr
 150 # undef __fortified_attr_access
 151 # undef __fortify_function
 152 # undef __glibc_c99_flexarr_available
 153 # undef __glibc_has_attribute
 154 # undef __glibc_has_builtin
 155 # undef __glibc_has_extension
 156 # undef __glibc_likely
 157 # undef __glibc_macro_warning
 158 # undef __glibc_macro_warning1
 159 # undef __glibc_unlikely
 160 # undef __inline
 161 # undef __ptr_t
 162 # undef __restrict
 163 # undef __restrict_arr
 164 # undef __va_arg_pack
 165 # undef __va_arg_pack_len
 166 # undef __warnattr
 167 # undef __wur
 168 # ifndef __GNULIB_CDEFS
 169 #  undef __bos
 170 #  undef __bos0
 171 #  undef __glibc_fortify
 172 #  undef __glibc_fortify_n
 173 #  undef __glibc_objsize
 174 #  undef __glibc_objsize0
 175 #  undef __glibc_safe_len_cond
 176 #  undef __glibc_safe_or_unknown_len
 177 #  undef __glibc_unsafe_len
 178 #  undef __glibc_unsigned_or_positive
 179 # endif
 180
 181 /* Include our copy of glibc <sys/cdefs.h>.  */
 182 # include <cdefs.h>
 183
 184 /* <cdefs.h> __inline is too pessimistic for non-GCC.  */
 185 # undef __inline
 186 # ifndef HAVE___INLINE
 187 #  if 199901 <= __STDC_VERSION__ || defined inline
 188 #   define __inline inline
 189 #  else
 190 #   define __inline
 191 #  endif
 192 # endif
 193
 194 #endif /* defined __glibc_likely */
 195
 196
 197 /* A substitute for glibc <libc-symbols.h>, good enough for Gnulib.  */
 198 #define attribute_hidden
 199 #define libc_hidden_proto(name)
 200 #define libc_hidden_def(name)
 201 #define libc_hidden_weak(name)
 202 #define libc_hidden_ver(local, name)
 203 #define strong_alias(name, aliasname)
 204 #define weak_alias(name, aliasname)
 205
 206 /* A substitute for glibc <shlib-compat.h>, good enough for Gnulib.  */
 207 #define SHLIB_COMPAT(lib, introduced, obsoleted) 0
 208 #define compat_symbol(lib, local, symbol, version) extern int dummy
 209 #define versioned_symbol(lib, local, symbol, version) extern int dummy