1# errno_h.m4 serial 12
2dnl Copyright (C) 2004, 2006, 2008-2012 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_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 ETXTBSY
14booboo
15#endif
16#if !defined ENOMSG
17booboo
18#endif
19#if !defined EIDRM
20booboo
21#endif
22#if !defined ENOLINK
23booboo
24#endif
25#if !defined EPROTO
26booboo
27#endif
28#if !defined EMULTIHOP
29booboo
30#endif
31#if !defined EBADMSG
32booboo
33#endif
34#if !defined EOVERFLOW
35booboo
36#endif
37#if !defined ENOTSUP
38booboo
39#endif
40#if !defined ENETRESET
41booboo
42#endif
43#if !defined ECONNABORTED
44booboo
45#endif
46#if !defined ESTALE
47booboo
48#endif
49#if !defined EDQUOT
50booboo
51#endif
52#if !defined ECANCELED
53booboo
54#endif
55#if !defined EOWNERDEAD
56booboo
57#endif
58#if !defined ENOTRECOVERABLE
59booboo
60#endif
61#if !defined EILSEQ
62booboo
63#endif
64      ],
65      [gl_cv_header_errno_h_complete=no],
66      [gl_cv_header_errno_h_complete=yes])
67  ])
68  if test $gl_cv_header_errno_h_complete = yes; then
69    ERRNO_H=''
70  else
71    gl_NEXT_HEADERS([errno.h])
72    ERRNO_H='errno.h'
73  fi
74  AC_SUBST([ERRNO_H])
75  AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])
76  gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
77  gl_REPLACE_ERRNO_VALUE([ENOLINK])
78  gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
79])
80
81# Assuming $1 = EOVERFLOW.
82# The EOVERFLOW errno value ought to be defined in <errno.h>, according to
83# POSIX.  But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
84# some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
85# Check for the value of EOVERFLOW.
86# Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
87AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
88[
89  if test -n "$ERRNO_H"; then
90    AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
91      AC_EGREP_CPP([yes],[
92#include <errno.h>
93#ifdef ]$1[
94yes
95#endif
96      ],
97      [gl_cv_header_errno_h_]$1[=yes],
98      [gl_cv_header_errno_h_]$1[=no])
99      if test $gl_cv_header_errno_h_]$1[ = no; then
100        AC_EGREP_CPP([yes],[
101#define _XOPEN_SOURCE_EXTENDED 1
102#include <errno.h>
103#ifdef ]$1[
104yes
105#endif
106          ], [gl_cv_header_errno_h_]$1[=hidden])
107        if test $gl_cv_header_errno_h_]$1[ = hidden; then
108          dnl The macro exists but is hidden.
109          dnl Define it to the same value.
110          AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
111#define _XOPEN_SOURCE_EXTENDED 1
112#include <errno.h>
113/* The following two lines are a workaround against an autoconf-2.52 bug.  */
114#include <stdio.h>
115#include <stdlib.h>
116])
117        fi
118      fi
119    ])
120    case $gl_cv_header_errno_h_]$1[ in
121      yes | no)
122        ]$1[_HIDDEN=0; ]$1[_VALUE=
123        ;;
124      *)
125        ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
126        ;;
127    esac
128    AC_SUBST($1[_HIDDEN])
129    AC_SUBST($1[_VALUE])
130  fi
131])
132
133dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
134dnl Remove this when we can assume autoconf >= 2.61.
135m4_ifdef([AC_COMPUTE_INT], [], [
136  AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
137])
138