kc3-lang/libiconv/m4/ln.m4

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• Hash : 70b9eb6d
  Author :
  Date : 2002-04-29T13:10:06
  

  Make autoconfiguration independent of clisp.
  

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• m4/ln.m4

• dnl Copyright (C) 1993-2002 Free Software Foundation, Inc.
  dnl This file is free software, distributed under the terms of the GNU
  dnl General Public License.  As a special exception to the GNU General
  dnl Public License, this file may be distributed as part of a program
  dnl that contains a configuration script generated by Autoconf, under
  dnl the same distribution terms as the rest of that program.
  
  dnl From Bruno Haible, Marcus Daniels.
  
  AC_PREREQ(2.13)
  
  AC_DEFUN([CL_PROG_LN],
  [AC_REQUIRE([CL_PROG_CP])dnl
  AC_CACHE_CHECK(how to make hard links, cl_cv_prog_LN, [
  rm -f conftestdata conftestfile
  echo data > conftestfile
  if ln conftestfile conftestdata 2>/dev/null; then
    cl_cv_prog_LN=ln
  else
    cl_cv_prog_LN="$cl_cv_prog_cp"
  fi
  rm -f conftestdata conftestfile
  ])
  LN="$cl_cv_prog_LN"
  AC_SUBST(LN)dnl
  ])
  
  AC_DEFUN([CL_PROG_LN_S],
  [AC_REQUIRE([CL_PROG_LN])dnl
  dnl Make a symlink if possible; otherwise try a hard link. On filesystems
  dnl which support neither symlink nor hard link, use a plain copy.
  AC_MSG_CHECKING(whether ln -s works)
  AC_CACHE_VAL(cl_cv_prog_LN_S, [
  rm -f conftestdata
  if ln -s X conftestdata 2>/dev/null; then
    cl_cv_prog_LN_S="ln -s"
  else
    cl_cv_prog_LN_S="$cl_cv_prog_LN"
  fi
  rm -f conftestdata
  ])dnl
  if test "$cl_cv_prog_LN_S" = "ln -s"; then
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi
  LN_S="$cl_cv_prog_LN_S"
  AC_SUBST(LN_S)dnl
  ])
  
  AC_DEFUN([CL_PROG_HLN],
  [AC_REQUIRE([CL_PROG_LN_S])dnl
  dnl SVR4 "ln" makes hard links to symbolic links, instead of resolving the
  dnl symbolic link. To avoid this, use the "hln" program.
  AC_CACHE_CHECK(how to make hard links to symlinks, cl_cv_prog_hln, [
  cl_cv_prog_hln="ln"
  if test "$cl_cv_prog_LN_S" = "ln -s"; then
  echo "blabla" > conftest.x
  ln -s conftest.x conftest.y
  ln conftest.y conftest.z 2>&AC_FD_CC
  rm -f conftest.x
  if cat conftest.z > /dev/null 2>&1 ; then
    # ln is usable.
    cl_cv_prog_hln="ln"
  else
    # conftest.z is a symbolic link to the non-existent conftest.x
    cl_cv_prog_hln="hln"
  fi
  else
  # If there are no symbolic links, the problem cannot occur.
  cl_cv_prog_hln="ln"
  fi
  rm -f conftest*
  ])
  HLN="$cl_cv_prog_hln"
  AC_SUBST(HLN)dnl
  ])
  

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