1# errno_h.m4 serial 13
2dnl Copyright (C) 2004, 2006, 2008-2021 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_PREREQ([2.61])
8
9AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],
10[
11  AC_REQUIRE([AC_PROG_CC])
12  AC_CACHE_CHECK([for complete errno.h], [gl_cv_header_errno_h_complete], [
13    AC_EGREP_CPP([booboo],[
14#include <errno.h>
15#if !defined ETXTBSY
16booboo
17#endif
18#if !defined ENOMSG
19booboo
20#endif
21#if !defined EIDRM
22booboo
23#endif
24#if !defined ENOLINK
25booboo
26#endif
27#if !defined EPROTO
28booboo
29#endif
30#if !defined EMULTIHOP
31booboo
32#endif
33#if !defined EBADMSG
34booboo
35#endif
36#if !defined EOVERFLOW
37booboo
38#endif
39#if !defined ENOTSUP
40booboo
41#endif
42#if !defined ENETRESET
43booboo
44#endif
45#if !defined ECONNABORTED
46booboo
47#endif
48#if !defined ESTALE
49booboo
50#endif
51#if !defined EDQUOT
52booboo
53#endif
54#if !defined ECANCELED
55booboo
56#endif
57#if !defined EOWNERDEAD
58booboo
59#endif
60#if !defined ENOTRECOVERABLE
61booboo
62#endif
63#if !defined EILSEQ
64booboo
65#endif
66      ],
67      [gl_cv_header_errno_h_complete=no],
68      [gl_cv_header_errno_h_complete=yes])
69  ])
70  if test $gl_cv_header_errno_h_complete = yes; then
71    ERRNO_H=''
72  else
73    gl_NEXT_HEADERS([errno.h])
74    ERRNO_H='errno.h'
75  fi
76  AC_SUBST([ERRNO_H])
77  AM_CONDITIONAL([GL_GENERATE_ERRNO_H], [test -n "$ERRNO_H"])
78  gl_REPLACE_ERRNO_VALUE([EMULTIHOP])
79  gl_REPLACE_ERRNO_VALUE([ENOLINK])
80  gl_REPLACE_ERRNO_VALUE([EOVERFLOW])
81])
82
83# Assuming $1 = EOVERFLOW.
84# The EOVERFLOW errno value ought to be defined in <errno.h>, according to
85# POSIX.  But some systems (like OpenBSD 4.0 or AIX 3) don't define it, and
86# some systems (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
87# Check for the value of EOVERFLOW.
88# Set the variables EOVERFLOW_HIDDEN and EOVERFLOW_VALUE.
89AC_DEFUN([gl_REPLACE_ERRNO_VALUE],
90[
91  if test -n "$ERRNO_H"; then
92    AC_CACHE_CHECK([for ]$1[ value], [gl_cv_header_errno_h_]$1, [
93      AC_EGREP_CPP([yes],[
94#include <errno.h>
95#ifdef ]$1[
96yes
97#endif
98      ],
99      [gl_cv_header_errno_h_]$1[=yes],
100      [gl_cv_header_errno_h_]$1[=no])
101      if test $gl_cv_header_errno_h_]$1[ = no; then
102        AC_EGREP_CPP([yes],[
103#define _XOPEN_SOURCE_EXTENDED 1
104#include <errno.h>
105#ifdef ]$1[
106yes
107#endif
108          ], [gl_cv_header_errno_h_]$1[=hidden])
109        if test $gl_cv_header_errno_h_]$1[ = hidden; then
110          dnl The macro exists but is hidden.
111          dnl Define it to the same value.
112          AC_COMPUTE_INT([gl_cv_header_errno_h_]$1, $1, [
113#define _XOPEN_SOURCE_EXTENDED 1
114#include <errno.h>
115/* The following two lines are a workaround against an autoconf-2.52 bug.  */
116#include <stdio.h>
117#include <stdlib.h>
118])
119        fi
120      fi
121    ])
122    case $gl_cv_header_errno_h_]$1[ in
123      yes | no)
124        ]$1[_HIDDEN=0; ]$1[_VALUE=
125        ;;
126      *)
127        ]$1[_HIDDEN=1; ]$1[_VALUE="$gl_cv_header_errno_h_]$1["
128        ;;
129    esac
130    AC_SUBST($1[_HIDDEN])
131    AC_SUBST($1[_VALUE])
132  fi
133])
134