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