lib/libc-config.h

   1 /* System definitions for code taken from the GNU C Library
   2
   3    Copyright 2017-2018 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 other platforms this
  37    is harmless.  */
  38 #include <errno.h>
  39
  40 /* From glibc <errno.h>.  */
  41 #ifndef __set_errno
  42 # define __set_errno(val) (errno = (val))
  43 #endif
  44
  45 /* From glibc <features.h>.  */
  46
  47 #ifndef __GNUC_PREREQ
  48 # if defined __GNUC__ && defined __GNUC_MINOR__
  49 #  define __GNUC_PREREQ(maj, min) ((maj) < __GNUC__ + ((min) <= __GNUC_MINOR__))
  50 # else
  51 #  define __GNUC_PREREQ(maj, min) 0
  52 # endif
  53 #endif
  54
  55 #ifndef __glibc_clang_prereq
  56 # if defined __clang_major__ && defined __clang_minor__
  57 #  define __glibc_clang_prereq(maj, min) \
  58      ((maj) < __clang_major__ + ((min) <= __clang_minor__))
  59 # else
  60 #  define __glibc_clang_prereq(maj, min) 0
  61 # endif
  62 #endif
  63
  64
  65 /* Prepare to include <cdefs.h>, which is our copy of glibc
  66    <sys/cdefs.h>.  */
  67
  68 /* Define _FEATURES_H so that <cdefs.h> does not include <features.h>.  */
  69 #ifndef _FEATURES_H
  70 # define _FEATURES_H 1
  71 #endif
  72 /* Define __WORDSIZE so that <cdefs.h> does not attempt to include
  73    nonexistent files.  Make it a syntax error, since Gnulib does not
  74    use __WORDSIZE now, and if Gnulib uses it later the syntax error
  75    will let us know that __WORDSIZE needs configuring.  */
  76 #ifndef __WORDSIZE
  77 # define __WORDSIZE %%%
  78 #endif
  79 /* Undef the macros unconditionally defined by our copy of glibc
  80    <sys/cdefs.h>, so that they do not clash with any system-defined
  81    versions.  */
  82 #undef _SYS_CDEFS_H
  83 #undef __ASMNAME
  84 #undef __ASMNAME2
  85 #undef __BEGIN_DECLS
  86 #undef __CONCAT
  87 #undef __END_DECLS
  88 #undef __HAVE_GENERIC_SELECTION
  89 #undef __LDBL_COMPAT
  90 #undef __LDBL_REDIR
  91 #undef __LDBL_REDIR1
  92 #undef __LDBL_REDIR1_DECL
  93 #undef __LDBL_REDIR1_NTH
  94 #undef __LDBL_REDIR_DECL
  95 #undef __LDBL_REDIR_NTH
  96 #undef __LEAF
  97 #undef __LEAF_ATTR
  98 #undef __NTH
  99 #undef __NTHNL
 100 #undef __P
 101 #undef __PMT
 102 #undef __REDIRECT
 103 #undef __REDIRECT_LDBL
 104 #undef __REDIRECT_NTH
 105 #undef __REDIRECT_NTHNL
 106 #undef __REDIRECT_NTH_LDBL
 107 #undef __STRING
 108 #undef __THROW
 109 #undef __THROWNL
 110 #undef __always_inline
 111 #undef __attribute__
 112 #undef __attribute_alloc_size__
 113 #undef __attribute_artificial__
 114 #undef __attribute_const__
 115 #undef __attribute_deprecated__
 116 #undef __attribute_deprecated_msg__
 117 #undef __attribute_format_arg__
 118 #undef __attribute_format_strfmon__
 119 #undef __attribute_malloc__
 120 #undef __attribute_noinline__
 121 #undef __attribute_pure__
 122 #undef __attribute_used__
 123 #undef __attribute_warn_unused_result__
 124 #undef __bos
 125 #undef __bos0
 126 #undef __errordecl
 127 #undef __extension__
 128 #undef __extern_always_inline
 129 #undef __extern_inline
 130 #undef __flexarr
 131 #undef __fortify_function
 132 #undef __glibc_c99_flexarr_available
 133 #undef __glibc_clang_has_extension
 134 #undef __glibc_likely
 135 #undef __glibc_macro_warning
 136 #undef __glibc_macro_warning1
 137 #undef __glibc_unlikely
 138 #undef __inline
 139 #undef __nonnull
 140 #undef __ptr_t
 141 #undef __restrict
 142 #undef __restrict_arr
 143 #undef __va_arg_pack
 144 #undef __va_arg_pack_len
 145 #undef __warnattr
 146 #undef __warndecl
 147
 148 /* Include our copy of glibc <sys/cdefs.h>.  */
 149 #include <cdefs.h>
 150
 151 /* <cdefs.h> __inline is too pessimistic for non-GCC.  */
 152 #undef __inline
 153 #ifndef HAVE___INLINE
 154 # if 199901 <= __STDC_VERSION__ || defined inline
 155 #  define __inline inline
 156 # else
 157 #  define __inline
 158 # endif
 159 #endif
 160
 161 /* <cdefs.h> __restrict is too pessimistic for non-GCC.  GCC 2.95 and
 162    later have "__restrict", and C99 compilers have "restrict".  */
 163 #undef __restrict
 164 #if !__GNUC_PREREQ (2, 95)
 165 # if 199901L <= __STDC_VERSION__
 166 #  define __restrict restrict
 167 # else
 168 #  define __restrict
 169 # endif
 170 #endif
 171
 172
 173 /* A substitute for glibc <libc-symbols.h>, good enough for Gnulib.  */
 174 #define attribute_hidden
 175 #define libc_hidden_proto(name, ...)
 176 #define libc_hidden_def(name)
 177 #define libc_hidden_weak(name)
 178 #define libc_hidden_ver(local, name)
 179 #define strong_alias(name, aliasname)
 180 #define weak_alias(name, aliasname)
 181
 182 /* A substitute for glibc <shlib-compat.h>, good enough for Gnulib.  */
 183 #define SHLIB_COMPAT(lib, introduced, obsoleted) 0
 184 #define versioned_symbol(lib, local, symbol, version)