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ax_check_aligned_access_required.m4
# ===================================================================================== # https://www.gnu.org/software/autoconf-archive/ax_check_aligned_access_required.html # ===================================================================================== # # SYNOPSIS # # AX_CHECK_ALIGNED_ACCESS_REQUIRED # # DESCRIPTION # # While the x86 CPUs allow access to memory objects to be unaligned it # happens that most of the modern designs require objects to be aligned - # or they will fail with a buserror. That mode is quite known by # big-endian machines (sparc, etc) however the alpha cpu is little- # endian. # # The following function will test for aligned access to be required and # set a config.h define HAVE_ALIGNED_ACCESS_REQUIRED (name derived by # standard usage). Structures loaded from a file (or mmapped to memory) # should be accessed per-byte in that case to avoid segfault type errors. # # The function checks if unaligned access would ignore the lowest bit of # the address. If that happens or if the test binary crashes, aligned # access is required. # # If cross-compiling, assume that aligned access is needed to be safe. Set # ax_cv_have_aligned_access_required=no to override that assumption. # # LICENSE # # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> # # 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 of the License, 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, see <https://www.gnu.org/licenses/>. # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 10 AC_DEFUN([AX_CHECK_ALIGNED_ACCESS_REQUIRED], [AC_CACHE_CHECK([if pointers to integers require aligned access], [ax_cv_have_aligned_access_required], [AC_RUN_IFELSE([ AC_LANG_PROGRAM([[@%:@include <stdlib.h>]], [[ int i; int *p; int *q; char *str; str = (char *) malloc(40); for (i = 0; i < 40; i++) { *(str + i) = i; } p = (int *) (str + 1); q = (int *) (str + 2); return (*p == *q); ]])], [ax_cv_have_aligned_access_required=no], [ax_cv_have_aligned_access_required=yes], [ax_cv_have_aligned_access_required=maybe])]) if test "x$ax_cv_have_aligned_access_required" = "xmaybe"; then AC_MSG_WARN([Assuming aligned access is required when cross-compiling]) ax_cv_have_aligned_access_required=yes fi if test "x$ax_cv_have_aligned_access_required" = "xyes"; then AC_DEFINE([HAVE_ALIGNED_ACCESS_REQUIRED], [1], [Define if pointers to integers require aligned access]) fi ])