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