mirror of git://git.gnupg.org/gnupg.git
65 lines
2.1 KiB
Plaintext
65 lines
2.1 KiB
Plaintext
# eoverflow.m4 serial 1
|
|
dnl Copyright (C) 2004 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([EOVERFLOW], ac_cv_decl_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
|
|
])
|