Harmonize rw_prog_cxx_works macro across projects
[lttng-tools.git] / m4 / ac_define_dir.m4
1 dnl @synopsis AC_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
2 dnl
3 dnl This macro sets VARNAME to the expansion of the DIR variable,
4 dnl taking care of fixing up ${prefix} and such.
5 dnl
6 dnl VARNAME is then offered as both an output variable and a C
7 dnl preprocessor symbol.
8 dnl
9 dnl Example:
10 dnl
11 dnl AC_DEFINE_DIR([DATADIR], [datadir], [Where data are placed to.])
12 dnl
13 dnl @category Misc
14 dnl @author Stepan Kasal <kasal@ucw.cz>
15 dnl @author Andreas Schwab <schwab@suse.de>
16 dnl @author Guido U. Draheim <guidod@gmx.de>
17 dnl @author Alexandre Oliva
18 dnl @version 2006-10-13
19 dnl @license AllPermissive
20
21 AC_DEFUN([AC_DEFINE_DIR], [
22 prefix_NONE=
23 exec_prefix_NONE=
24 test "x$prefix" = xNONE && prefix_NONE=yes && prefix=$ac_default_prefix
25 test "x$exec_prefix" = xNONE && exec_prefix_NONE=yes && exec_prefix=$prefix
26 dnl In Autoconf 2.60, ${datadir} refers to ${datarootdir}, which in turn
27 dnl refers to ${prefix}. Thus we have to use `eval' twice.
28 eval ac_define_dir="\"[$]$2\""
29 eval ac_define_dir="\"$ac_define_dir\""
30 AC_SUBST($1, "$ac_define_dir")
31 AC_DEFINE_UNQUOTED($1, "$ac_define_dir", [$3])
32 test "$prefix_NONE" && prefix=NONE
33 test "$exec_prefix_NONE" && exec_prefix=NONE
34 ])
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