actions: introduce start session action
[lttng-tools.git] / m4 / ax_define_dir.m4
1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_define_dir.html
3 # ===========================================================================
4 #
5 # OBSOLETE MACRO
6 #
7 # Deprecated because it does not comply with the GNU Coding Standards. See
8 # the autoconf manual section "Defining Directories" for alternatives.
9 #
10 # SYNOPSIS
11 #
12 # AX_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
13 #
14 # DESCRIPTION
15 #
16 # This macro sets VARNAME to the expansion of the DIR variable, taking
17 # care of fixing up ${prefix} and such.
18 #
19 # VARNAME is then offered as both an output variable and a C preprocessor
20 # symbol.
21 #
22 # Example:
23 #
24 # AX_DEFINE_DIR([DATADIR], [datadir], [Where data are placed to.])
25 #
26 # LICENSE
27 #
28 # Copyright (c) 2008 Stepan Kasal <kasal@ucw.cz>
29 # Copyright (c) 2008 Andreas Schwab <schwab@suse.de>
30 # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
31 # Copyright (c) 2008 Alexandre Oliva
32 #
33 # Copying and distribution of this file, with or without modification, are
34 # permitted in any medium without royalty provided the copyright notice
35 # and this notice are preserved. This file is offered as-is, without any
36 # warranty.
37
38 #serial 8
39
40 AU_ALIAS([AC_DEFINE_DIR], [AX_DEFINE_DIR])
41 AC_DEFUN([AX_DEFINE_DIR], [
42 prefix_NONE=
43 exec_prefix_NONE=
44 test "x$prefix" = xNONE && prefix_NONE=yes && prefix=$ac_default_prefix
45 test "x$exec_prefix" = xNONE && exec_prefix_NONE=yes && exec_prefix=$prefix
46 dnl In Autoconf 2.60, ${datadir} refers to ${datarootdir}, which in turn
47 dnl refers to ${prefix}. Thus we have to use `eval' twice.
48 eval ax_define_dir="\"[$]$2\""
49 eval ax_define_dir="\"$ax_define_dir\""
50 AC_SUBST($1, "$ax_define_dir")
51 AC_DEFINE_UNQUOTED($1, "$ax_define_dir", [$3])
52 test "$prefix_NONE" && prefix=NONE
53 test "$exec_prefix_NONE" && exec_prefix=NONE
54 ])
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