1dnl Copyright (C) 1993-2002 Free Software Foundation, Inc. 2dnl This file is free software, distributed under the terms of the GNU 3dnl General Public License. As a special exception to the GNU General 4dnl Public License, this file may be distributed as part of a program 5dnl that contains a configuration script generated by Autoconf, under 6dnl the same distribution terms as the rest of that program. 7 8dnl From Bruno Haible, Marcus Daniels. 9 10AC_PREREQ(2.13) 11 12AC_DEFUN([CL_PROG_LN], 13[AC_REQUIRE([CL_PROG_CP])dnl 14AC_CACHE_CHECK(how to make hard links, cl_cv_prog_LN, [ 15rm -f conftestdata conftestfile 16echo data > conftestfile 17if ln conftestfile conftestdata 2>/dev/null; then 18 cl_cv_prog_LN=ln 19else 20 cl_cv_prog_LN="$cl_cv_prog_cp" 21fi 22rm -f conftestdata conftestfile 23]) 24LN="$cl_cv_prog_LN" 25AC_SUBST(LN)dnl 26]) 27 28AC_DEFUN([CL_PROG_LN_S], 29[AC_REQUIRE([CL_PROG_LN])dnl 30dnl Make a symlink if possible; otherwise try a hard link. On filesystems 31dnl which support neither symlink nor hard link, use a plain copy. 32AC_MSG_CHECKING(whether ln -s works) 33AC_CACHE_VAL(cl_cv_prog_LN_S, [ 34rm -f conftestdata 35if ln -s X conftestdata 2>/dev/null; then 36 cl_cv_prog_LN_S="ln -s" 37else 38 cl_cv_prog_LN_S="$cl_cv_prog_LN" 39fi 40rm -f conftestdata 41])dnl 42if test "$cl_cv_prog_LN_S" = "ln -s"; then 43 AC_MSG_RESULT(yes) 44else 45 AC_MSG_RESULT(no) 46fi 47LN_S="$cl_cv_prog_LN_S" 48AC_SUBST(LN_S)dnl 49]) 50 51AC_DEFUN([CL_PROG_HLN], 52[AC_REQUIRE([CL_PROG_LN_S])dnl 53dnl SVR4 "ln" makes hard links to symbolic links, instead of resolving the 54dnl symbolic link. To avoid this, use the "hln" program. 55AC_CACHE_CHECK(how to make hard links to symlinks, cl_cv_prog_hln, [ 56cl_cv_prog_hln="ln" 57if test "$cl_cv_prog_LN_S" = "ln -s"; then 58echo "blabla" > conftest.x 59ln -s conftest.x conftest.y 60ln conftest.y conftest.z 2>&AC_FD_CC 61rm -f conftest.x 62if cat conftest.z > /dev/null 2>&1 ; then 63 # ln is usable. 64 cl_cv_prog_hln="ln" 65else 66 # conftest.z is a symbolic link to the non-existent conftest.x 67 cl_cv_prog_hln="hln" 68fi 69else 70# If there are no symbolic links, the problem cannot occur. 71cl_cv_prog_hln="ln" 72fi 73rm -f conftest* 74]) 75HLN="$cl_cv_prog_hln" 76AC_SUBST(HLN)dnl 77]) 78