boinc/m4/sah_links.m4

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AC_DEFUN([SAH_LINKS],[
AC_PATH_PROGS(LN,[ln cp copy])
if test -n "$LN" ; then
AC_MSG_CHECKING(whether '$LN' works)
if $LN config.sub erase.me$$ && \
test -e erase.me$$ && \
diff config.sub erase.me$$ >/dev/null 2>&5
then
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
LN=cp
fi
/bin/rm erase.me$$
else
LN=cp
fi
AC_PROG_LN_S
if test -n "$LN_S" ; then
AC_MSG_CHECKING(whether '$LN_S' really works or whether I'm deluding myself)
if $LN_S config.sub erase.me$$ && \
test -e erase.me$$ && \
diff config.sub erase.me$$ >/dev/null 2>&5
then
AC_MSG_RESULT(it works)
else
AC_MSG_RESULT(I'm deluding myself)
LN_S=cp
fi
/bin/rm erase.me$$
else
LN_S=cp
fi
])