2 dnl Copyright (C) 2004, 2006, 2008 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([gl_HEADER_ERRNO_H],
9 dnl Use AC_REQUIRE here, so that the default behavior below is expanded
10 dnl once only, before all statements that occur in other macros.
11 AC_REQUIRE([gl_HEADER_ERRNO_H_BODY])
14 AC_DEFUN([gl_HEADER_ERRNO_H_BODY],
16 AC_REQUIRE([AC_PROG_CC])
17 AC_CACHE_CHECK([for complete errno.h], gl_cv_header_errno_h_complete, [
24 [gl_cv_header_errno_h_complete=no],
25 [gl_cv_header_errno_h_complete=yes])
27 if test $gl_cv_header_errno_h_complete = yes; then
30 gl_CHECK_NEXT_HEADERS([errno.h])
34 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
35 gl_REPLACE_ERRNO_VALUE([ENOLINK])
36 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
39 # Assuming $1 = EOVERFLOW.
40 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
41 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
42 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
43 # Check for the value of EOVERFLOW.
44 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
45 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
47 if test -n "$ERRNO_H"; then
48 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
55 [gl_cv_header_errno_h_]$1[=yes],
56 [gl_cv_header_errno_h_]$1[=no])
57 if test $gl_cv_header_errno_h_]$1[ = no; then
59 #define _XOPEN_SOURCE_EXTENDED 1
64 ], [gl_cv_header_errno_h_]$1[=hidden])
65 if test $gl_cv_header_errno_h_]$1[ = hidden; then
66 dnl The macro exists but is hidden.
67 dnl Define it to the same value.
68 AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
69 #define _XOPEN_SOURCE_EXTENDED 1
71 /* The following two lines are a workaround against an autoconf-2.52 bug. */
78 case $gl_cv_header_errno_h_]$1[ in
80 ]$1[_HIDDEN=0; ]$1[_VALUE=
83 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["