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1 # errno_h.m4 serial 2
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2 dnl Copyright (C) 2004, 2006, 2008 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_HEADER_ERRNO_H],
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8 [
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9 dnl Use AC_REQUIRE here, so that the default behavior below is expanded
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10 dnl once only, before all statements that occur in other macros.
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11 AC_REQUIRE([gl_HEADER_ERRNO_H_BODY])
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12 ])
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13
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14 AC_DEFUN([gl_HEADER_ERRNO_H_BODY],
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15 [
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16 AC_REQUIRE([AC_PROG_CC])
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17 AC_CACHE_CHECK([for complete errno.h], gl_cv_header_errno_h_complete, [
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18 AC_EGREP_CPP(booboo,[
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19 #include <errno.h>
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20 #if !defined ENOMSG
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21 booboo
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22 #endif
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23 #if !defined EIDRM
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24 booboo
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25 #endif
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26 #if !defined ENOLINK
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27 booboo
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28 #endif
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29 #if !defined EPROTO
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30 booboo
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31 #endif
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32 #if !defined EMULTIHOP
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33 booboo
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34 #endif
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35 #if !defined EBADMSG
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36 booboo
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37 #endif
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38 #if !defined EOVERFLOW
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39 booboo
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40 #endif
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41 #if !defined ENOTSUP
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42 booboo
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43 #endif
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44 #if !defined ECANCELED
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45 booboo
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46 #endif
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47 ],
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48 [gl_cv_header_errno_h_complete=no],
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49 [gl_cv_header_errno_h_complete=yes])
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50 ])
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51 if test $gl_cv_header_errno_h_complete = yes; then
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52 ERRNO_H=''
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53 else
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54 gl_CHECK_NEXT_HEADERS([errno.h])
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55 ERRNO_H='errno.h'
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56 fi
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57 AC_SUBST([ERRNO_H])
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58 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
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59 gl_REPLACE_ERRNO_VALUE([ENOLINK])
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60 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
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61 ])
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62
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63 # Assuming $1 = EOVERFLOW.
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64 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
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65 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
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66 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
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67 # Check for the value of EOVERFLOW.
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68 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
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69 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
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70 [
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71 if test -n "$ERRNO_H"; then
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72 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
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73 AC_EGREP_CPP(yes,[
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74 #include <errno.h>
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75 #ifdef ]$1[
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76 yes
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77 #endif
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78 ],
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79 [gl_cv_header_errno_h_]$1[=yes],
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80 [gl_cv_header_errno_h_]$1[=no])
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81 if test $gl_cv_header_errno_h_]$1[ = no; then
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82 AC_EGREP_CPP(yes,[
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83 #define _XOPEN_SOURCE_EXTENDED 1
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84 #include <errno.h>
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85 #ifdef ]$1[
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86 yes
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87 #endif
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88 ], [gl_cv_header_errno_h_]$1[=hidden])
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89 if test $gl_cv_header_errno_h_]$1[ = hidden; then
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90 dnl The macro exists but is hidden.
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91 dnl Define it to the same value.
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92 AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
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93 #define _XOPEN_SOURCE_EXTENDED 1
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94 #include <errno.h>
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95 /* The following two lines are a workaround against an autoconf-2.52 bug. */
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96 #include <stdio.h>
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97 #include <stdlib.h>
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98 ])
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99 fi
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100 fi
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101 ])
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102 case $gl_cv_header_errno_h_]$1[ in
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103 yes | no)
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104 ]$1[_HIDDEN=0; ]$1[_VALUE=
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105 ;;
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106 *)
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107 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
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108 ;;
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109 esac
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110 AC_SUBST($1[_HIDDEN])
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111 AC_SUBST($1[_VALUE])
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112 fi
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113 ])
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114
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115 dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
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116 dnl Remove this when we can assume autoconf >= 2.61.
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117 m4_ifdef([AC_COMPUTE_INT], [], [
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118 AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
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119 ])
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