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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prog_cp_s.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_CP_S
#
# DESCRIPTION
#
# 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.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# 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. This file is offered as-is, without any
# warranty.
#serial 7
AU_ALIAS([AC_PROG_CP_S], [AX_PROG_CP_S])
AC_DEFUN([AX_PROG_CP_S],
[AC_REQUIRE([AC_PROG_LN_S])dnl
AC_MSG_CHECKING(whether cp -s works)
AC_CACHE_VAL(ac_cv_prog_CP_S,
[rm -f conftestdata
if cp -s X conftestdata 2>/dev/null
then
rm -f conftestdata
ac_cv_prog_CP_S="cp -s"
else
ac_cv_prog_CP_S=cp
fi
if test "$LN_S" = "ln -s" ; then
ac_cv_prog_CP_S="ln -s"
fi])dnl
CP_S="$ac_cv_prog_CP_S"
if test "$ac_cv_prog_CP_S" = "ln -s"; then
AC_MSG_RESULT(using ln -s)
elif test "$ac_cv_prog_CP_S" = "cp -s"; then
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no, using cp)
fi
AC_SUBST(CP_S)dnl
])
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