# errno_h.m4 serial 6

dnl Copyright (C) 2004, 2006, 2008, 2009, 2010 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],

[

AC_REQUIRE([AC_PROG_CC])

AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [

AC_EGREP_CPP([booboo],[

#include <errno.h>

#if !defined ENOMSG

booboo

#endif

#if !defined EIDRM

booboo

#endif

#if !defined ENOLINK

booboo

#endif

#if !defined EPROTO

booboo

#endif

#if !defined EMULTIHOP

booboo

#endif

#if !defined EBADMSG

booboo

#endif

#if !defined EOVERFLOW

booboo

#endif

#if !defined ENOTSUP

booboo

#endif

#if !defined ESTALE

booboo

#endif

#if !defined ECANCELED

booboo

#endif

],

[gl_cv_header_errno_h_complete=no],

[gl_cv_header_errno_h_complete=yes])

])

if test $gl_cv_header_errno_h_complete = yes; then

ERRNO_H=''

else

gl_CHECK_NEXT_HEADERS([errno.h])

ERRNO_H='errno.h'

fi

AC_SUBST([ERRNO_H])

gl_REPLACE_ERRNO_VALUE([EMULTIHOP])

gl_REPLACE_ERRNO_VALUE([ENOLINK])

gl_REPLACE_ERRNO_VALUE([EOVERFLOW])

])

# Assuming $1 = EOVERFLOW.

# The EOVERFLOW errno value ought to be defined in <errno.h>, according to

# POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and

# some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.

# Check for the value of EOVERFLOW.

# Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.

AC_DEFUN([gl_REPLACE_ERRNO_VALUE],

[

if test -n "$ERRNO_H"; then

AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [

AC_EGREP_CPP([yes],[

#include <errno.h>

#ifdef ]$1[

yes

#endif

],

[gl_cv_header_errno_h_]$1[=yes],

[gl_cv_header_errno_h_]$1[=no])

if test $gl_cv_header_errno_h_]$1[ = no; then

AC_EGREP_CPP([yes],[

#define _XOPEN_SOURCE_EXTENDED 1

#include <errno.h>

#ifdef ]$1[

yes

#endif

], [gl_cv_header_errno_h_]$1[=hidden])

if test $gl_cv_header_errno_h_]$1[ = hidden; then

dnl The macro exists but is hidden.

dnl Define it to the same value.

AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [

#define _XOPEN_SOURCE_EXTENDED 1

#include <errno.h>

/* The following two lines are a workaround against an autoconf-2.52 bug. */

#include <stdio.h>

#include <stdlib.h>

])

fi

fi

])

case $gl_cv_header_errno_h_]$1[ in

yes | no)

]$1[_HIDDEN=0; ]$1[_VALUE=

;;

*)

]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["

;;

esac

AC_SUBST($1[_HIDDEN])

AC_SUBST($1[_VALUE])

fi

])

dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.

dnl Remove this when we can assume autoconf >= 2.61.

m4_ifdef([AC_COMPUTE_INT], [], [

AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])

])