gnulib/import/m4/errno_h.m4

   1 # errno_h.m4 serial 13
   2 dnl Copyright (C) 2004, 2006, 2008-2019 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_PREREQ([2.61])
   8
   9 AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
  10 [
  11   AC_REQUIRE([AC_PROG_CC])
  12   AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
  13     AC_EGREP_CPP([booboo],[
  14 #include <errno.h>
  15 #if !defined ETXTBSY
  16 booboo
  17 #endif
  18 #if !defined ENOMSG
  19 booboo
  20 #endif
  21 #if !defined EIDRM
  22 booboo
  23 #endif
  24 #if !defined ENOLINK
  25 booboo
  26 #endif
  27 #if !defined EPROTO
  28 booboo
  29 #endif
  30 #if !defined EMULTIHOP
  31 booboo
  32 #endif
  33 #if !defined EBADMSG
  34 booboo
  35 #endif
  36 #if !defined EOVERFLOW
  37 booboo
  38 #endif
  39 #if !defined ENOTSUP
  40 booboo
  41 #endif
  42 #if !defined ENETRESET
  43 booboo
  44 #endif
  45 #if !defined ECONNABORTED
  46 booboo
  47 #endif
  48 #if !defined ESTALE
  49 booboo
  50 #endif
  51 #if !defined EDQUOT
  52 booboo
  53 #endif
  54 #if !defined ECANCELED
  55 booboo
  56 #endif
  57 #if !defined EOWNERDEAD
  58 booboo
  59 #endif
  60 #if !defined ENOTRECOVERABLE
  61 booboo
  62 #endif
  63 #if !defined EILSEQ
  64 booboo
  65 #endif
  66       ],
  67       [gl_cv_header_errno_h_complete=no],
  68       [gl_cv_header_errno_h_complete=yes])
  69   ])
  70   if test $gl_cv_header_errno_h_complete = yes; then
  71     ERRNO_H=''
  72   else
  73     gl_NEXT_HEADERS([errno.h])
  74     ERRNO_H='errno.h'
  75   fi
  76   AC_SUBST([ERRNO_H])
  77   AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])
  78   gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
  79   gl_REPLACE_ERRNO_VALUE([ENOLINK])
  80   gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
  81 ])
  82
  83 # Assuming $1 = EOVERFLOW.
  84 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
  85 # POSIX.  But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
  86 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
  87 # Check for the value of EOVERFLOW.
  88 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
  89 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
  90 [
  91   if test -n "$ERRNO_H"; then
  92     AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
  93       AC_EGREP_CPP([yes],[
  94 #include <errno.h>
  95 #ifdef ]$1[
  96 yes
  97 #endif
  98       ],
  99       [gl_cv_header_errno_h_]$1[=yes],
 100       [gl_cv_header_errno_h_]$1[=no])
 101       if test $gl_cv_header_errno_h_]$1[ = no; then
 102         AC_EGREP_CPP([yes],[
 103 #define _XOPEN_SOURCE_EXTENDED 1
 104 #include <errno.h>
 105 #ifdef ]$1[
 106 yes
 107 #endif
 108           ], [gl_cv_header_errno_h_]$1[=hidden])
 109         if test $gl_cv_header_errno_h_]$1[ = hidden; then
 110           dnl The macro exists but is hidden.
 111           dnl Define it to the same value.
 112           AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
 113 #define _XOPEN_SOURCE_EXTENDED 1
 114 #include <errno.h>
 115 /* The following two lines are a workaround against an autoconf-2.52 bug.  */
 116 #include <stdio.h>
 117 #include <stdlib.h>
 118 ])
 119         fi
 120       fi
 121     ])
 122     case $gl_cv_header_errno_h_]$1[ in
 123       yes | no)
 124         ]$1[_HIDDEN=0; ]$1[_VALUE=
 125         ;;
 126       *)
 127         ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
 128         ;;
 129     esac
 130     AC_SUBST($1[_HIDDEN])
 131     AC_SUBST($1[_VALUE])
 132   fi
 133 ])