lib/libc-config.h

   1 /* System definitions for code taken from the GNU C Library
   2
   3    Copyright 2017-2021 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 #include <config.h>
  34
  35 /* On glibc this includes <features.h> and <sys/cdefs.h> and #defines
  36    _FEATURES_H, __WORDSIZE, and __set_errno.  On FreeBSD 11 it
  37    includes <sys/cdefs.h> which defines __nonnull.  Elsewhere it
  38    is harmless.  */
  39 #include <errno.h>
  40
  41 /* From glibc <errno.h>.  */
  42 #ifndef __set_errno
  43 # define __set_errno(val) (errno = (val))
  44 #endif
  45
  46 /* From glibc <features.h>.  */
  47
  48 #ifndef __GNUC_PREREQ
  49 # if defined __GNUC__ && defined __GNUC_MINOR__
  50 #  define __GNUC_PREREQ(maj, min) ((maj) < __GNUC__ + ((min) <= __GNUC_MINOR__))
  51 # else
  52 #  define __GNUC_PREREQ(maj, min) 0
  53 # endif
  54 #endif
  55
  56 #ifndef __glibc_clang_prereq
  57 # if defined __clang_major__ && defined __clang_minor__
  58 #  ifdef __apple_build_version__
  59 /* Apple for some reason renumbers __clang_major__ and __clang_minor__.
  60    Gnulib code uses only __glibc_clang_prereq (3, 5); map it to
  61    6000000 <= __apple_build_version__.  Support for other calls to
  62    __glibc_clang_prereq can be added here as needed.  */
  63 #   define __glibc_clang_prereq(maj, min) \
  64       ((maj) == 3 && (min) == 5 ? 6000000 <= __apple_build_version__ : 0)
  65 #  else
  66 #   define __glibc_clang_prereq(maj, min) \
  67       ((maj) < __clang_major__ + ((min) <= __clang_minor__))
  68 #  endif
  69 # else
  70 #  define __glibc_clang_prereq(maj, min) 0
  71 # endif
  72 #endif
  73
  74 #ifndef __attribute_maybe_unused__
  75 /* <sys/cdefs.h> either does not exist, or is too old for Gnulib.
  76    Prepare to include <cdefs.h>, which is Gnulib's version of a
  77    more-recent glibc <sys/cdefs.h>.  */
  78
  79 /* Define _FEATURES_H so that <cdefs.h> does not include <features.h>.  */
  80 # ifndef _FEATURES_H
  81 #  define _FEATURES_H 1
  82 # endif
  83 /* Define __WORDSIZE so that <cdefs.h> does not attempt to include
  84    nonexistent files.  Make it a syntax error, since Gnulib does not
  85    use __WORDSIZE now, and if Gnulib uses it later the syntax error
  86    will let us know that __WORDSIZE needs configuring.  */
  87 # ifndef __WORDSIZE
  88 #  define __WORDSIZE %%%
  89 # endif
  90 /* Undef the macros unconditionally defined by our copy of glibc
  91    <sys/cdefs.h>, so that they do not clash with any system-defined
  92    versions.  */
  93 # undef _SYS_CDEFS_H
  94 # undef __ASMNAME
  95 # undef __ASMNAME2
  96 # undef __BEGIN_DECLS
  97 # undef __CONCAT
  98 # undef __END_DECLS
  99 # undef __HAVE_GENERIC_SELECTION
 100 # undef __LDBL_COMPAT
 101 # undef __LDBL_REDIR
 102 # undef __LDBL_REDIR1
 103 # undef __LDBL_REDIR1_DECL
 104 # undef __LDBL_REDIR1_NTH
 105 # undef __LDBL_REDIR2_DECL
 106 # undef __LDBL_REDIR_DECL
 107 # undef __LDBL_REDIR_NTH
 108 # undef __LEAF
 109 # undef __LEAF_ATTR
 110 # undef __NTH
 111 # undef __NTHNL
 112 # undef __REDIRECT
 113 # undef __REDIRECT_LDBL
 114 # undef __REDIRECT_NTH
 115 # undef __REDIRECT_NTHNL
 116 # undef __REDIRECT_NTH_LDBL
 117 # undef __STRING
 118 # undef __THROW
 119 # undef __THROWNL
 120 # undef __attr_access
 121 # undef __attribute__
 122 # undef __attribute_alloc_size__
 123 # undef __attribute_artificial__
 124 # undef __attribute_const__
 125 # undef __attribute_deprecated__
 126 # undef __attribute_deprecated_msg__
 127 # undef __attribute_format_arg__
 128 # undef __attribute_format_strfmon__
 129 # undef __attribute_malloc__
 130 # undef __attribute_noinline__
 131 # undef __attribute_nonstring__
 132 # undef __attribute_pure__
 133 # undef __attribute_returns_twice__
 134 # undef __attribute_used__
 135 # undef __attribute_warn_unused_result__
 136 # undef __bos
 137 # undef __bos0
 138 # undef __errordecl
 139 # undef __extension__
 140 # undef __extern_always_inline
 141 # undef __extern_inline
 142 # undef __flexarr
 143 # undef __fortify_function
 144 # undef __glibc_c99_flexarr_available
 145 # undef __glibc_has_attribute
 146 # undef __glibc_has_builtin
 147 # undef __glibc_has_extension
 148 # undef __glibc_macro_warning
 149 # undef __glibc_macro_warning1
 150 # undef __glibc_objsize
 151 # undef __glibc_objsize0
 152 # undef __glibc_unlikely
 153 # undef __inline
 154 # undef __ptr_t
 155 # undef __restrict
 156 # undef __restrict_arr
 157 # undef __va_arg_pack
 158 # undef __va_arg_pack_len
 159 # undef __warnattr
 160
 161 /* Include our copy of glibc <sys/cdefs.h>.  */
 162 # include <cdefs.h>
 163
 164 /* <cdefs.h> __inline is too pessimistic for non-GCC.  */
 165 # undef __inline
 166 # ifndef HAVE___INLINE
 167 #  if 199901 <= __STDC_VERSION__ || defined inline
 168 #   define __inline inline
 169 #  else
 170 #   define __inline
 171 #  endif
 172 # endif
 173
 174 #endif /* defined __glibc_likely */
 175
 176
 177 /* A substitute for glibc <libc-symbols.h>, good enough for Gnulib.  */
 178 #define attribute_hidden
 179 #define libc_hidden_proto(name)
 180 #define libc_hidden_def(name)
 181 #define libc_hidden_weak(name)
 182 #define libc_hidden_ver(local, name)
 183 #define strong_alias(name, aliasname)
 184 #define weak_alias(name, aliasname)
 185
 186 /* A substitute for glibc <shlib-compat.h>, good enough for Gnulib.  */
 187 #define SHLIB_COMPAT(lib, introduced, obsoleted) 0
 188 #define compat_symbol(lib, local, symbol, version) extern int dummy
 189 #define versioned_symbol(lib, local, symbol, version) extern int dummy