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annotate m4/ac_define_dir.m4 @ 355:d1f930be4711

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From Jeffrey Morlan: pst_build_id_ptr and pst_build_desc_ptr require that the first child of a BTree page have the same starting ID as itself. This is not required by the spec, and is not true in many real-world PSTs (presumably, the original first child of the page got deleted). Because of this, many emails are not being extracted from these PSTs. It also triggers an infinite loop in lspst (a separate bug, also fixed)
author Carl Byington <carl@five-ten-sg.com>
date Wed, 06 Jul 2016 10:12:22 -0700
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1 # ===========================================================================
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2 # http://autoconf-archive.cryp.to/ac_define_dir.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AC_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
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8 #
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9 # DESCRIPTION
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10 #
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11 # This macro sets VARNAME to the expansion of the DIR variable, taking
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12 # care of fixing up ${prefix} and such.
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13 #
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14 # VARNAME is then offered as both an output variable and a C preprocessor
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15 # symbol.
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16 #
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17 # Example:
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18 #
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19 # AC_DEFINE_DIR([DATADIR], [datadir], [Where data are placed to.])
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20 #
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21 # LAST MODIFICATION
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22 #
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23 # 2008-04-12
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24 #
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25 # COPYLEFT
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26 #
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27 # Copyright (c) 2008 Stepan Kasal <kasal@ucw.cz>
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28 # Copyright (c) 2008 Andreas Schwab <schwab@suse.de>
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29 # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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30 # Copyright (c) 2008 Alexandre Oliva
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31 #
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32 # Copying and distribution of this file, with or without modification, are
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33 # permitted in any medium without royalty provided the copyright notice
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34 # and this notice are preserved.
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35
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36 AC_DEFUN([AC_DEFINE_DIR], [
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37 prefix_NONE=
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38 exec_prefix_NONE=
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39 test "x$prefix" = xNONE && prefix_NONE=yes && prefix=$ac_default_prefix
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40 test "x$exec_prefix" = xNONE && exec_prefix_NONE=yes && exec_prefix=$prefix
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41 dnl In Autoconf 2.60, ${datadir} refers to ${datarootdir}, which in turn
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42 dnl refers to ${prefix}. Thus we have to use `eval' twice.
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43 eval ac_define_dir="\"[$]$2\""
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44 eval ac_define_dir="\"$ac_define_dir\""
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45 AC_SUBST($1, "$ac_define_dir")
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46 AC_DEFINE_UNQUOTED($1, "$ac_define_dir", [$3])
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47 test "$prefix_NONE" && prefix=NONE
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48 test "$exec_prefix_NONE" && exec_prefix=NONE
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49 ])