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# Copyright 2008 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Boston, MA
# 02110-1301, USA.
AC_DEFUN([GR_CHECK_MEMALIGN],
[
AC_REQUIRE([AC_CANONICAL_HOST])
# Check for allocing memory alignment functions
# If 'posix_memalign' is available, use it solely.
AC_CHECK_FUNCS([posix_memalign],,[
# Otherwise, check for valloc and the
# (a-priori known) alignment of 'malloc'
AC_CHECK_FUNCS([valloc])
aligned_malloc=0
# 'malloc' is 16-byte aligned on (at least) Darwin 8 and 9
case "$host_os" in
darwin8*) aligned_malloc=16 ;;
darwin9*) aligned_malloc=16 ;;
*) ;;
esac
if test $aligned_malloc = 0; then
AC_MSG_RESULT([malloc has unknown alignment.])
else
AC_MSG_RESULT([malloc is $aligned_malloc-byte aligned.])
fi
AC_DEFINE_UNQUOTED([ALIGNED_MALLOC],[$aligned_malloc],[Define as the alignment of malloc if known; otherwise 0.])
])
])
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