nptl/sysdeps/i386/i686/Makefile

   1 # Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2 # This file is part of the GNU C Library.
   3 # Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5 # The GNU C Library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9
  10 # The GNU C Library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with the GNU C Library; if not, see
  17 # <http://www.gnu.org/licenses/>.
  18
  19 ifeq ($(subdir),nptl)
  20 # It turns out that stack coloring is in general not good on P4s.  Some
  21 # applications will benefit.  We will probably have a configuration option
  22 # at some point.  Enabling coloring can be done with
  23 #
  24 #   -DCOLORING_INCREMENT=128
  25 #
  26 # What is useful is to avoid the 64k aliasing problem which reliably
  27 # happens if all stacks use sizes which are a multiple of 64k.  Tell
  28 # the stack allocator to disturb this by allocation one more page if
  29 # necessary.
  30 CFLAGS-pthread_create.c += -DMULTI_PAGE_ALIASING=65536
  31 endif