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Annotation of embedaddon/libiconv/m4/ln.m4, revision 1.1.1.1

1.1       misho       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: ])