1#serial 1
2
3AC_PREREQ(2.50)
4
5# The EILSEQ errno value ought to be defined in <errno.h>, according to
6# ISO C 99 and POSIX.  But some systems (like SunOS 4) don't define it,
7# and some systems (like BSD/OS) define it in <wchar.h> not <errno.h>.
8
9# Define EILSEQ as a C macro and as a substituted macro in such a way that
10# 1. on all systems, after inclusion of <errno.h>, EILSEQ is usable,
11# 2. on systems where EILSEQ is defined elsewhere, we use the same numeric
12#    value.
13
14AC_DEFUN([AC_EILSEQ],
15[
16  AC_REQUIRE([AC_PROG_CC])dnl
17
18  dnl Check for any extra headers that could define EILSEQ.
19  AC_CHECK_HEADERS(wchar.h)
20
21  AC_CACHE_CHECK([for EILSEQ], ac_cv_decl_EILSEQ, [
22    AC_EGREP_CPP(yes,[
23#include <errno.h>
24#ifdef EILSEQ
25yes
26#endif
27      ], have_eilseq=1)
28    if test -n "$have_eilseq"; then
29      dnl EILSEQ exists in <errno.h>. Don't need to define EILSEQ ourselves.
30      ac_cv_decl_EILSEQ=yes
31    else
32      AC_EGREP_CPP(yes,[
33#include <errno.h>
34#if HAVE_WCHAR_H
35#include <wchar.h>
36#endif
37#ifdef EILSEQ
38yes
39#endif
40        ], have_eilseq=1)
41      if test -n "$have_eilseq"; then
42        dnl EILSEQ exists in some other system header.
43        dnl Define it to the same value.
44        _AC_COMPUTE_INT([EILSEQ], ac_cv_decl_EILSEQ, [
45#include <errno.h>
46#if HAVE_WCHAR_H
47#include <wchar.h>
48#endif
49/* The following two lines are a workaround against an autoconf-2.52 bug.  */
50#include <stdio.h>
51#include <stdlib.h>
52])
53      else
54        dnl EILSEQ isn't defined by the system. Define EILSEQ ourselves, but
55        dnl don't define it as EINVAL, because iconv() callers want to
56        dnl distinguish EINVAL and EILSEQ.
57        ac_cv_decl_EILSEQ=ENOENT
58      fi
59    fi
60  ])
61  if test "$ac_cv_decl_EILSEQ" != yes; then
62    AC_DEFINE_UNQUOTED([EILSEQ], [$ac_cv_decl_EILSEQ],
63                       [Define as good substitute value for EILSEQ.])
64    EILSEQ="$ac_cv_decl_EILSEQ"
65    AC_SUBST(EILSEQ)
66  fi
67])
68