2
dnl Copyright (C) 2004, 2006, 2008, 2009, 2010 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.
7
AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
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],[
25
#if !defined EMULTIHOP
31
#if !defined EOVERFLOW
40
#if !defined ECANCELED
44
[gl_cv_header_errno_h_complete=no],
45
[gl_cv_header_errno_h_complete=yes])
47
if test $gl_cv_header_errno_h_complete = yes; then
50
gl_CHECK_NEXT_HEADERS([errno.h])
54
gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
55
gl_REPLACE_ERRNO_VALUE([ENOLINK])
56
gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
59
# Assuming $1 = EOVERFLOW.
60
# The EOVERFLOW errno value ought to be defined in <errno.h>, according to
61
# POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
62
# some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
63
# Check for the value of EOVERFLOW.
64
# Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
65
AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
67
if test -n "$ERRNO_H"; then
68
AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
75
[gl_cv_header_errno_h_]$1[=yes],
76
[gl_cv_header_errno_h_]$1[=no])
77
if test $gl_cv_header_errno_h_]$1[ = no; then
79
#define _XOPEN_SOURCE_EXTENDED 1
84
], [gl_cv_header_errno_h_]$1[=hidden])
85
if test $gl_cv_header_errno_h_]$1[ = hidden; then
86
dnl The macro exists but is hidden.
87
dnl Define it to the same value.
88
AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
89
#define _XOPEN_SOURCE_EXTENDED 1
91
/* The following two lines are a workaround against an autoconf-2.52 bug. */
98
case $gl_cv_header_errno_h_]$1[ in
100
]$1[_HIDDEN=0; ]$1[_VALUE=
103
]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
106
AC_SUBST($1[_HIDDEN])
111
dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
112
dnl Remove this when we can assume autoconf >= 2.61.
113
m4_ifdef([AC_COMPUTE_INT], [], [
114
AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])