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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 01d4631f17cc
children 8250f2777afc
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# serial 3
# See if we need to provide mkfifoat/mknodat replacement.

dnl Copyright (C) 2009-2011 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.

# Written by Eric Blake.

AC_DEFUN([gl_FUNC_MKFIFOAT],
[
  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
  AC_REQUIRE([gl_FUNC_OPENAT])
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  AC_CHECK_FUNCS_ONCE([mkfifoat mknodat])
  if test $ac_cv_func_mkfifoat = no; then
    # No known system has mkfifoat but not mknodat
    HAVE_MKFIFOAT=0
    HAVE_MKNODAT=0
  fi
])