Check how to make a copy by creating a symbolic link to the original - it defines the variable CP_S for further use, which you should in fact treat like it used to be with be LN_S. The actual value is assured to be either LN_S (if the filesystem supports symbolic links) or CP (if the filesystem does not know about symbolic links and you need a copy of original file to have the same text in both places). In a gnu environment it will simply set CP_S="cp -s" since the gnu "cp"-command has the "-s" flag. You shall not try to use this command on directories since it would require a "-r" in the case of a copy that is not supported explicitly here. (I’m not sure if some "cp"-commands out there would barf at usage of "-r" on a normal file).
Use CP_S to create a copy of read-only data - if your filesystem supports it then a symbolic link is created - a process that is quicker and space-saving. However, if the target fs does not support symbolic links, just copy the data. Unlike ac_prog_ln_s this macro will never fail to set the CP_S ac_subst to something that works.
Download the latest version of ax_prog_cp_s.m4 or browse the macro’s revision history.
Copyright © 2008 Guido U. Draheim email@example.com
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 <http://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.