2 dnl Copyright (C) 2004, 2006, 2008, 2009 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], [
18 AC_EGREP_CPP([booboo],[
32 #if !defined EMULTIHOP
38 #if !defined EOVERFLOW
44 #if !defined ECANCELED
48 [gl_cv_header_errno_h_complete=no],
49 [gl_cv_header_errno_h_complete=yes])
51 if test $gl_cv_header_errno_h_complete = yes; then
54 gl_CHECK_NEXT_HEADERS([errno.h])
58 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
59 gl_REPLACE_ERRNO_VALUE([ENOLINK])
60 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
63 # Assuming $1 = EOVERFLOW.
64 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
65 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
66 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
67 # Check for the value of EOVERFLOW.
68 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
69 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
71 if test -n "$ERRNO_H"; then
72 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
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
83 #define _XOPEN_SOURCE_EXTENDED 1
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
95 /* The following two lines are a workaround against an autoconf-2.52 bug. */
102 case $gl_cv_header_errno_h_]$1[ in
104 ]$1[_HIDDEN=0; ]$1[_VALUE=
107 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
110 AC_SUBST($1[_HIDDEN])
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])])