view m4/group-member.m4 @ 15426:60c6b6da0198

ffs: avoid undefined behavior * lib/ffs.c (ffs): Provide fallback for non-32-bit int. * tests/test-ffs.c (naive, main): Avoid signed shifts. Reported by Bruno Haible. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Fri, 15 Jul 2011 14:26:43 -0600
parents 7a1b4cd6d351
children 8250f2777afc
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# serial 14

# Copyright (C) 1999-2001, 2003-2007, 2009-2011 Free Software Foundation, Inc.

# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

dnl Written by Jim Meyering

AC_DEFUN([gl_FUNC_GROUP_MEMBER],
[
  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])

  dnl Persuade glibc <unistd.h> to declare group_member().
  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  dnl Do this replacement check manually because I want the hyphen
  dnl (not the underscore) in the filename.
  AC_CHECK_FUNC([group_member], , [
    HAVE_GROUP_MEMBER=0
  ])
])

# Prerequisites of lib/group-member.c.
AC_DEFUN([gl_PREREQ_GROUP_MEMBER],
[
  AC_REQUIRE([AC_FUNC_GETGROUPS])
])