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