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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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1 # Check whether free (NULL) is supposed to work.
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2
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3 # Copyright (C) 2003-2005, 2009-2019 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 # Written by Paul Eggert.
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9
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10 # We can't test for free (NULL) even at runtime, since it might
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11 # happen to "work" for our test program, but not in general. So, be
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12 # conservative and use feature tests for relatively modern hosts,
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13 # where free (NULL) is known to work. This costs a bit of
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14 # performance on some older hosts, but we can fix that later if
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15 # needed.
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16
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17 AC_DEFUN([gl_FUNC_FREE],
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18 [
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19 AC_REQUIRE([AC_CANONICAL_HOST])
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20 AC_CACHE_CHECK([whether free (NULL) is known to work],
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21 [gl_cv_func_free],
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22 [case "$host_os" in
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23 mingw*) gl_cv_func_free=yes ;;
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24 *)
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25 AC_COMPILE_IFELSE(
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26 [AC_LANG_PROGRAM(
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27 [[@%:@include <unistd.h>]],
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28 [[@%:@if _POSIX_VERSION < 199009L && \
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29 (defined unix || defined _unix || defined _unix_ \
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30 || defined __unix || defined __unix__)
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31 @%:@error "'free (NULL)' is not known to work"
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32 @%:@endif]])],
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33 [gl_cv_func_free=yes],
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34 [gl_cv_func_free=no])
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35 esac
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36 ])
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37
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38 if test $gl_cv_func_free = no; then
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39 AC_DEFINE([free], [rpl_free],
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40 [Define to rpl_free if the replacement function should be used.])
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41 fi
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42 ])
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43
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44 # Prerequisites of lib/free.c.
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45 AC_DEFUN([gl_PREREQ_FREE], [:])