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1 # errno_h.m4 serial 4
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2 dnl Copyright (C) 2004, 2006, 2008, 2009 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 dnl This macro must pass through AC_REQUIRE (never directly invoke it).
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8 AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
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9 [
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10 AC_REQUIRE([AC_PROG_CC])
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11 AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
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12 AC_EGREP_CPP([booboo],[
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13 #include <errno.h>
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14 #if !defined ENOMSG
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15 booboo
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16 #endif
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17 #if !defined EIDRM
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18 booboo
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19 #endif
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20 #if !defined ENOLINK
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21 booboo
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22 #endif
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23 #if !defined EPROTO
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24 booboo
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25 #endif
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26 #if !defined EMULTIHOP
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27 booboo
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28 #endif
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29 #if !defined EBADMSG
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30 booboo
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31 #endif
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32 #if !defined EOVERFLOW
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33 booboo
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34 #endif
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35 #if !defined ENOTSUP
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36 booboo
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37 #endif
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38 #if !defined ECANCELED
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39 booboo
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40 #endif
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41 ],
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42 [gl_cv_header_errno_h_complete=no],
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43 [gl_cv_header_errno_h_complete=yes])
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44 ])
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45 if test $gl_cv_header_errno_h_complete = yes; then
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46 ERRNO_H=''
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47 else
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48 gl_CHECK_NEXT_HEADERS([errno.h])
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49 ERRNO_H='errno.h'
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50 fi
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51 AC_SUBST([ERRNO_H])
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52 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
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53 gl_REPLACE_ERRNO_VALUE([ENOLINK])
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54 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
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55 ])
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56
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57 # Assuming $1 = EOVERFLOW.
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58 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
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59 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
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60 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
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61 # Check for the value of EOVERFLOW.
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62 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
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63 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
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64 [
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65 if test -n "$ERRNO_H"; then
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66 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
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67 AC_EGREP_CPP([yes],[
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68 #include <errno.h>
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69 #ifdef ]$1[
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70 yes
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71 #endif
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72 ],
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73 [gl_cv_header_errno_h_]$1[=yes],
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74 [gl_cv_header_errno_h_]$1[=no])
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75 if test $gl_cv_header_errno_h_]$1[ = no; then
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76 AC_EGREP_CPP([yes],[
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77 #define _XOPEN_SOURCE_EXTENDED 1
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78 #include <errno.h>
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79 #ifdef ]$1[
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80 yes
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81 #endif
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82 ], [gl_cv_header_errno_h_]$1[=hidden])
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83 if test $gl_cv_header_errno_h_]$1[ = hidden; then
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84 dnl The macro exists but is hidden.
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85 dnl Define it to the same value.
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86 AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
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87 #define _XOPEN_SOURCE_EXTENDED 1
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88 #include <errno.h>
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89 /* The following two lines are a workaround against an autoconf-2.52 bug. */
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90 #include <stdio.h>
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91 #include <stdlib.h>
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92 ])
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93 fi
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94 fi
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95 ])
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96 case $gl_cv_header_errno_h_]$1[ in
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97 yes | no)
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98 ]$1[_HIDDEN=0; ]$1[_VALUE=
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99 ;;
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100 *)
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101 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
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102 ;;
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103 esac
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104 AC_SUBST($1[_HIDDEN])
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105 AC_SUBST($1[_VALUE])
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106 fi
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107 ])
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108
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109 dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
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110 dnl Remove this when we can assume autoconf >= 2.61.
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111 m4_ifdef([AC_COMPUTE_INT], [], [
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112 AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
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113 ])
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