m4/errno_h.m4

   1 # errno_h.m4 serial 9
   2 dnl Copyright (C) 2004, 2006, 2008-2011 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 ESTALE
  38 booboo
  39 #endif
  40 #if !defined EDQUOT
  41 booboo
  42 #endif
  43 #if !defined ECANCELED
  44 booboo
  45 #endif
  46       ],
  47       [gl_cv_header_errno_h_complete=no],
  48       [gl_cv_header_errno_h_complete=yes])
  49   ])
  50   if test $gl_cv_header_errno_h_complete = yes; then
  51     ERRNO_H=''
  52   else
  53     gl_NEXT_HEADERS([errno.h])
  54     ERRNO_H='errno.h'
  55   fi
  56   AC_SUBST([ERRNO_H])
  57   AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])
  58   gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
  59   gl_REPLACE_ERRNO_VALUE([ENOLINK])
  60   gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
  61 ])
  62
  63 # Assuming $1 = EOVERFLOW.
  64 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
  65 # POSIX.  But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
  66 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
  67 # Check for the value of EOVERFLOW.
  68 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
  69 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
  70 [
  71   if test -n "$ERRNO_H"; then
  72     AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
  73       AC_EGREP_CPP([yes],[
  74 #include <errno.h>
  75 #ifdef ]$1[
  76 yes
  77 #endif
  78       ],
  79       [gl_cv_header_errno_h_]$1[=yes],
  80       [gl_cv_header_errno_h_]$1[=no])
  81       if test $gl_cv_header_errno_h_]$1[ = no; then
  82         AC_EGREP_CPP([yes],[
  83 #define _XOPEN_SOURCE_EXTENDED 1
  84 #include <errno.h>
  85 #ifdef ]$1[
  86 yes
  87 #endif
  88           ], [gl_cv_header_errno_h_]$1[=hidden])
  89         if test $gl_cv_header_errno_h_]$1[ = hidden; then
  90           dnl The macro exists but is hidden.
  91           dnl Define it to the same value.
  92           AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
  93 #define _XOPEN_SOURCE_EXTENDED 1
  94 #include <errno.h>
  95 /* The following two lines are a workaround against an autoconf-2.52 bug.  */
  96 #include <stdio.h>
  97 #include <stdlib.h>
  98 ])
  99         fi
 100       fi
 101     ])
 102     case $gl_cv_header_errno_h_]$1[ in
 103       yes | no)
 104         ]$1[_HIDDEN=0; ]$1[_VALUE=
 105         ;;
 106       *)
 107         ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
 108         ;;
 109     esac
 110     AC_SUBST($1[_HIDDEN])
 111     AC_SUBST($1[_VALUE])
 112   fi
 113 ])
 114
 115 dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
 116 dnl Remove this when we can assume autoconf >= 2.61.
 117 m4_ifdef([AC_COMPUTE_INT], [], [
 118   AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
 119 ])