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comparison m4/errno_h.m4 @ 272:d5392bb5da3c 2.5

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author lost
date Sun, 16 Aug 2009 17:16:49 +0000
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271:3b793ba7a6c6 272:d5392bb5da3c
1 # errno_h.m4 serial 2
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.
6
7 AC_DEFUN([gl_HEADER_ERRNO_H],
8 [
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])
12 ])
13
14 AC_DEFUN([gl_HEADER_ERRNO_H_BODY],
15 [
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,[
19 #include <errno.h>
20 #if !defined ENOMSG
21 booboo
22 #endif
23 #if !defined EIDRM
24 booboo
25 #endif
26 #if !defined ENOLINK
27 booboo
28 #endif
29 #if !defined EPROTO
30 booboo
31 #endif
32 #if !defined EMULTIHOP
33 booboo
34 #endif
35 #if !defined EBADMSG
36 booboo
37 #endif
38 #if !defined EOVERFLOW
39 booboo
40 #endif
41 #if !defined ENOTSUP
42 booboo
43 #endif
44 #if !defined ECANCELED
45 booboo
46 #endif
47 ],
48 [gl_cv_header_errno_h_complete=no],
49 [gl_cv_header_errno_h_complete=yes])
50 ])
51 if test $gl_cv_header_errno_h_complete = yes; then
52 ERRNO_H=''
53 else
54 gl_CHECK_NEXT_HEADERS([errno.h])
55 ERRNO_H='errno.h'
56 fi
57 AC_SUBST([ERRNO_H])
58 gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
59 gl_REPLACE_ERRNO_VALUE([ENOLINK])
60 gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
61 ])
62
63 # Assuming $1 = EOVERFLOW.
64 # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
65 # POSIX. But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
66 # some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
67 # Check for the value of EOVERFLOW.
68 # Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
69 AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
70 [
71 if test -n "$ERRNO_H"; then
72 AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
73 AC_EGREP_CPP(yes,[
74 #include <errno.h>
75 #ifdef ]$1[
76 yes
77 #endif
78 ],
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
82 AC_EGREP_CPP(yes,[
83 #define _XOPEN_SOURCE_EXTENDED 1
84 #include <errno.h>
85 #ifdef ]$1[
86 yes
87 #endif
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
94 #include <errno.h>
95 /* The following two lines are a workaround against an autoconf-2.52 bug. */
96 #include <stdio.h>
97 #include <stdlib.h>
98 ])
99 fi
100 fi
101 ])
102 case $gl_cv_header_errno_h_]$1[ in
103 yes | no)
104 ]$1[_HIDDEN=0; ]$1[_VALUE=
105 ;;
106 *)
107 ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
108 ;;
109 esac
110 AC_SUBST($1[_HIDDEN])
111 AC_SUBST($1[_VALUE])
112 fi
113 ])
114
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])])
119 ])