mirror of
https://git.tukaani.org/xz.git
synced 2024-04-04 12:36:23 +02:00
36 lines
1.1 KiB
Text
36 lines
1.1 KiB
Text
##### http://autoconf-archive.cryp.to/ax_c_arithmetic_rshift.html
|
|
#
|
|
# SYNOPSIS
|
|
#
|
|
# AX_C_ARITHMETIC_RSHIFT
|
|
#
|
|
# DESCRIPTION
|
|
#
|
|
# Checks if the right shift operation is arithmetic.
|
|
#
|
|
# This macro uses compile-time detection and so is cross-compile
|
|
# ready.
|
|
#
|
|
# LAST MODIFICATION
|
|
#
|
|
# 2006-12-12
|
|
#
|
|
# COPYLEFT
|
|
#
|
|
# Copyright (c) 2006 YAMAMOTO Kengo <yamaken AT bp.iij4u.or.jp>
|
|
#
|
|
# Copying and distribution of this file, with or without
|
|
# modification, are permitted in any medium without royalty provided
|
|
# the copyright notice and this notice are preserved.
|
|
|
|
AC_DEFUN([AX_C_ARITHMETIC_RSHIFT], [
|
|
AC_CACHE_CHECK([whether right shift operation is arithmetic],
|
|
[ax_cv_c_arithmetic_rshift],
|
|
[AC_COMPILE_IFELSE([[int dummy[((-1 >> 1) < 0) ? 1 : -1];]],
|
|
[ax_cv_c_arithmetic_rshift=yes],
|
|
[ax_cv_c_arithmetic_rshift=no])])
|
|
if test "x$ax_cv_c_arithmetic_rshift" = xyes; then
|
|
AC_DEFINE([HAVE_ARITHMETIC_RSHIFT], [1],
|
|
[Define to 1 if the right shift operation is arithmetic.])
|
|
fi
|
|
])
|