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#serial 2
AC_PREREQ([2.61])
# The EILSEQ errno value ought to be defined in <errno.h>, according to
# ISO C 99 and POSIX. But some systems (like SunOS 4) don't define it,
# and some systems (like BSD/OS) define it in <wchar.h> not <errno.h>.
# Define EILSEQ as a C macro and as a substituted macro in such a way that
# 1. on all systems, after inclusion of <errno.h>, EILSEQ is usable,
# 2. on systems where EILSEQ is defined elsewhere, we use the same numeric
# value.
AC_DEFUN([AC_EILSEQ],
[
AC_REQUIRE([AC_PROG_CC])dnl
dnl Check for any extra headers that could define EILSEQ.
AC_CHECK_HEADERS([wchar.h])
AC_CACHE_CHECK([for EILSEQ], [ac_cv_decl_EILSEQ], [
AC_EGREP_CPP([yes],[
#include <errno.h>
#ifdef EILSEQ
yes
#endif
], [have_eilseq=1])
if test -n "$have_eilseq"; then
dnl EILSEQ exists in <errno.h>. Don't need to define EILSEQ ourselves.
ac_cv_decl_EILSEQ=yes
else
AC_EGREP_CPP([yes],[
#include <errno.h>
#if HAVE_WCHAR_H
#include <wchar.h>
#endif
#ifdef EILSEQ
yes
#endif
], [have_eilseq=1])
if test -n "$have_eilseq"; then
dnl EILSEQ exists in some other system header.
dnl Define it to the same value.
AC_COMPUTE_INT([ac_cv_decl_EILSEQ], [EILSEQ], [
#include <errno.h>
#if HAVE_WCHAR_H
#include <wchar.h>
#endif
/* The following two lines are a workaround against an autoconf-2.52 bug. */
#include <stdio.h>
#include <stdlib.h>
])
else
dnl EILSEQ isn't defined by the system. Define EILSEQ ourselves, but
dnl don't define it as EINVAL, because iconv() callers want to
dnl distinguish EINVAL and EILSEQ.
ac_cv_decl_EILSEQ=ENOENT
fi
fi
])
if test "$ac_cv_decl_EILSEQ" != yes; then
AC_DEFINE_UNQUOTED([EILSEQ], [$ac_cv_decl_EILSEQ],
[Define as good substitute value for EILSEQ.])
EILSEQ="$ac_cv_decl_EILSEQ"
AC_SUBST([EILSEQ])
fi
])
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