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annotate m4/link.m4 @ 18070:d460ec17f09f

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author Karl Berry <karl@freefriends.org>
date Tue, 28 Jul 2015 13:57:32 -0700
parents ab58d4870664
children
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Bruno Haible <bruno@clisp.org>
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1 # link.m4 serial 8
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Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2009-2015 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_LINK],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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11 AC_CHECK_FUNCS_ONCE([link])
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12 if test $ac_cv_func_link = no; then
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13 HAVE_LINK=0
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14 else
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15 AC_CACHE_CHECK([whether link obeys POSIX],
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16 [gl_cv_func_link_works],
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17 [touch conftest.a
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18 # Assume that if we have lstat, we can also check symlinks.
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19 if test $ac_cv_func_lstat = yes; then
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20 ln -s conftest.a conftest.lnk
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21 fi
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22 AC_RUN_IFELSE(
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23 [AC_LANG_PROGRAM(
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24 [[#include <unistd.h>
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25 ]],
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26 [[int result = 0;
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27 if (!link ("conftest.a", "conftest.b/"))
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28 result |= 1;
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29 #if HAVE_LSTAT
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30 if (!link ("conftest.lnk/", "conftest.b"))
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31 result |= 2;
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32 if (rename ("conftest.a", "conftest.b"))
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33 result |= 4;
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34 if (!link ("conftest.b", "conftest.lnk"))
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35 result |= 8;
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36 #endif
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37 return result;
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38 ]])],
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39 [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
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40 [case "$host_os" in
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41 # Guess yes on glibc systems.
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42 *-gnu*) gl_cv_func_link_works="guessing yes" ;;
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43 # If we don't know, assume the worst.
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44 *) gl_cv_func_link_works="guessing no" ;;
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45 esac
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46 ])
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47 rm -f conftest.a conftest.b conftest.lnk])
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48 case "$gl_cv_func_link_works" in
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49 *yes) ;;
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50 *)
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51 REPLACE_LINK=1
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52 ;;
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53 esac
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54 fi
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55 ])