+#################################################
+# check for extended attribute support
+AC_MSG_CHECKING(whether to support extended attributes)
+AC_ARG_ENABLE(xattr-support,
+ AC_HELP_STRING([--disable-xattr-support],
+ [disable extended attributes]),
+ [], [case "$ac_cv_func_getxattr$ac_cv_func_extattr_get_link" in
+ *yes*) enable_xattr_support=maybe ;;
+ *) enable_xattr_support=no ;;
+ esac])
+AH_TEMPLATE([SUPPORT_XATTRS],
+[Define to 1 to add support for extended attributes])
+if test x"$enable_xattr_support" = x"no"; then
+ AC_MSG_RESULT(no)
+else
+ case "$host_os" in
+ *linux*)
+ AC_MSG_RESULT(Using Linux xattrs)
+ AC_DEFINE(HAVE_LINUX_XATTRS, 1, [True if you have Linux xattrs])
+ AC_DEFINE(SUPPORT_XATTRS, 1)
+ ;;
+ darwin*)
+ AC_MSG_RESULT(Using OS X xattrs)
+ AC_DEFINE(HAVE_OSX_XATTRS, 1, [True if you have Mac OS X xattrs])
+ AC_DEFINE(SUPPORT_XATTRS, 1)
+ ;;
+ freebsd*)
+ AC_MSG_RESULT(Using FreeBSD extattrs)
+ AC_DEFINE(HAVE_FREEBSD_XATTRS, 1, [True if you have FreeBSD xattrs])
+ AC_DEFINE(SUPPORT_XATTRS, 1)
+ ;;
+ *)
+ if test x"$enable_xattr_support" = x"yes"; then
+ AC_MSG_ERROR(Failed to find extended attribute support)
+ else
+ AC_MSG_RESULT(No extended attribute support found)
+ fi
+ ;;
+ esac
+fi
+
+if test x"$enable_acl_support" = x"no" -o x"$enable_xattr_support" = x"no" -o x"$enable_iconv" = x"no"; then
+ AC_MSG_CHECKING([whether $CC supports -Wno-unused-parameter])
+ OLD_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -Wno-unused-parameter"
+ AC_COMPILE_IFELSE([ ], [rsync_warn_flag=yes], [rsync_warn_flag=no])
+ AC_MSG_RESULT([$rsync_warn_flag])
+ if test x"$rsync_warn_flag" = x"no"; then
+ CFLAGS="$OLD_CFLAGS"
+ fi
+fi
+
+case "$CC" in
+' checker'*|checker*)
+ AC_DEFINE(FORCE_FD_ZERO_MEMSET, 1, [Used to make "checker" understand that FD_ZERO() clears memory.])
+ ;;
+esac
+