m4/errno_h.m4

   1 # errno_h.m4 serial 10
   2 dnl Copyright (C) 2004, 2006, 2008-2012 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_DEFUN_ONCE([gl_HEADER_ERRNO_H],
   8 [
   9   AC_REQUIRE([AC_PROG_CC])
  10   AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
  11     AC_EGREP_CPP([booboo],[
  12 #include <errno.h>
  13 #if !defined ENOMSG
  14 booboo
  15 #endif
  16 #if !defined EIDRM
  17 booboo
  18 #endif
  19 #if !defined ENOLINK
  20 booboo
  21 #endif
  22 #if !defined EPROTO
  23 booboo
  24 #endif
  25 #if !defined EMULTIHOP
  26 booboo
  27 #endif
  28 #if !defined EBADMSG
  29 booboo
  30 #endif
  31 #if !defined EOVERFLOW
  32 booboo
  33 #endif
  34 #if !defined ENOTSUP
  35 booboo
  36 #endif
  37 #if !defined ENETRESET
  38 booboo
  39 #endif
  40 #if !defined ECONNABORTED
  41 booboo
  42 #endif
  43 #if !defined ESTALE
  44 booboo
  45 #endif
  46 #if !defined EDQUOT
  47 booboo
  48 #endif
  49 #if !defined ECANCELED
  50 booboo
  51 #endif
  52       ],
  53       [gl_cv_header_errno_h_complete=no],
  54       [gl_cv_header_errno_h_complete=yes])
  55   ])
  56   if test $gl_cv_header_errno_h_complete = yes; then
  57     ERRNO_H=''
  58   else
  59     gl_NEXT_HEADERS([errno.h])
  60     ERRNO_H='errno.h'
  61   fi
  62   AC_SUBST([ERRNO_H])
  63   AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])
  64   gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
  65   gl_REPLACE_ERRNO_VALUE([ENOLINK])
  66   gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
  67 ])
  68
  69 # Assuming $1 = EOVERFLOW.
  70 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
  71 # POSIX.  But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
  72 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
  73 # Check for the value of EOVERFLOW.
  74 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
  75 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
  76 [
  77   if test -n "$ERRNO_H"; then
  78     AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
  79       AC_EGREP_CPP([yes],[
  80 #include <errno.h>
  81 #ifdef ]$1[
  82 yes
  83 #endif
  84       ],
  85       [gl_cv_header_errno_h_]$1[=yes],
  86       [gl_cv_header_errno_h_]$1[=no])
  87       if test $gl_cv_header_errno_h_]$1[ = no; then
  88         AC_EGREP_CPP([yes],[
  89 #define _XOPEN_SOURCE_EXTENDED 1
  90 #include <errno.h>
  91 #ifdef ]$1[
  92 yes
  93 #endif
  94           ], [gl_cv_header_errno_h_]$1[=hidden])
  95         if test $gl_cv_header_errno_h_]$1[ = hidden; then
  96           dnl The macro exists but is hidden.
  97           dnl Define it to the same value.
  98           AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
  99 #define _XOPEN_SOURCE_EXTENDED 1
 100 #include <errno.h>
 101 /* The following two lines are a workaround against an autoconf-2.52 bug.  */
 102 #include <stdio.h>
 103 #include <stdlib.h>
 104 ])
 105         fi
 106       fi
 107     ])
 108     case $gl_cv_header_errno_h_]$1[ in
 109       yes | no)
 110         ]$1[_HIDDEN=0; ]$1[_VALUE=
 111         ;;
 112       *)
 113         ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
 114         ;;
 115     esac
 116     AC_SUBST($1[_HIDDEN])
 117     AC_SUBST($1[_VALUE])
 118   fi
 119 ])
 120
 121 dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
 122 dnl Remove this when we can assume autoconf >= 2.61.
 123 m4_ifdef([AC_COMPUTE_INT], [], [
 124   AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
 125 ])