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# eoverflow.m4 serial 2
dnl Copyright (C) 2004, 2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible.
# The EOVERFLOW errno value ought to be defined in <errno.h>, according to
# POSIX. But some systems (like AIX 3) don't define it, and some systems
# (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
# Define EOVERFLOW as a C macro and as a substituted macro in such a way that
# 1. on all systems, after inclusion of <errno.h>, EOVERFLOW is usable,
# 2. on systems where EOVERFLOW is defined elsewhere, we use the same numeric
# value.
AC_DEFUN([gl_EOVERFLOW],
[
AC_REQUIRE([AC_PROG_CC])dnl
AC_CACHE_CHECK([for EOVERFLOW], ac_cv_decl_EOVERFLOW, [
AC_EGREP_CPP(yes,[
#include <errno.h>
#ifdef EOVERFLOW
yes
#endif
], have_eoverflow=1)
if test -n "$have_eoverflow"; then
dnl EOVERFLOW exists in <errno.h>. Don't need to define EOVERFLOW ourselves.
ac_cv_decl_EOVERFLOW=yes
else
AC_EGREP_CPP(yes,[
#define _XOPEN_SOURCE_EXTENDED 1
#include <errno.h>
#ifdef EOVERFLOW
yes
#endif
], have_eoverflow=1)
if test -n "$have_eoverflow"; then
dnl EOVERFLOW exists but is hidden.
dnl Define it to the same value.
AC_COMPUTE_INT([ac_cv_decl_EOVERFLOW], [EOVERFLOW], [
#define _XOPEN_SOURCE_EXTENDED 1
#include <errno.h>
/* The following two lines are a workaround against an autoconf-2.52 bug. */
#include <stdio.h>
#include <stdlib.h>
])
else
dnl EOVERFLOW isn't defined by the system. Define EOVERFLOW ourselves, but
dnl don't define it as EINVAL, because snprintf() callers want to
dnl distinguish EINVAL and EOVERFLOW.
ac_cv_decl_EOVERFLOW=E2BIG
fi
fi
])
if test "$ac_cv_decl_EOVERFLOW" != yes; then
AC_DEFINE_UNQUOTED([EOVERFLOW], [$ac_cv_decl_EOVERFLOW],
[Define as good substitute value for EOVERFLOW.])
EOVERFLOW="$ac_cv_decl_EOVERFLOW"
AC_SUBST(EOVERFLOW)
fi
])
dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
dnl Remove this when we can assume autoconf >= 2.61.
m4_ifdef([AC_COMPUTE_INT], [], [
AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
])
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