Add epoll check to autoconf and Makefile
[lttng-tools.git] / config / config_feature.m4
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DG
1# ===========================================================================
2# http://www.gnu.org/software/autoconf-archive/ax_config_feature.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_CONFIG_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION, DEFINE, DEFINE-DESCRIPTION, [ACTION-IF-ENABLED [, ACTION-IF-NOT-ENABLED]])
8#
9# DESCRIPTION
10#
11# AX_CONFIG_FEATURE is a simple wrapper for AC_ARG_ENABLE, it enables the
12# feature FEATURE-NAME and AC_DEFINEs the passed DEFINE, depending on the
13# user choice. DESCRIPTION will be used for AC_DEFINEs. ACTION-IF-ENABLED
14# and ACTION-IF-NOT-ENABLED are the actions that will be run. A feature is
15# enabled by default, in order to change this behaviour use the
16# AX_CONFIG_FEATURE_DEFAULT_ENABLED and AX_CONFIG_FEATURE_DEFAULT_DISABLED
17# macros.
18#
19# A simple example:
20#
21# AX_CONFIG_FEATURE_DEFAULT_ENABLED
22# AX_CONFIG_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
23# HAVE_XXXXX, [Define if you want XXXXX support])
24#
25# ...
26#
27# AX_CONFIG_FEATURE_DEFAULT_DISABLED
28# AX_CONFIG_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
29# HAVE_YYYYY, [Define if you want YYYYY support],
30# [enable_yyyyy="yes"], [enable_yyyyy="no"])
31# AM_CONDITIONAL(YYYYY, [test "$enable_yyyyy" = "yes"])
32#
33# AX_CONFIG_FEATURE_DEFAULT_ENABLED
34# AX_CONFIG_FEATURE(...)
35#
36# ...
37#
38# If you have lot of features and you want a verbose dumping of each user
39# selection use AX_CONFIG_FEATURE_VERBOSE. Use AX_CONFIG_FEATURE_SILENT in
40# order to remove a previously AX_CONFIG_FEATURE_VERBOSE. By default
41# features are silent.
42#
43# Use AX_CONFIG_FEATURE_ENABLE or AX_CONFIG_FEATURE_DISABLE in order to
44# enable or disable a specific feature.
45#
46# Another simple example:
47#
48# AS_IF([some_test_here],[AX_CONFIG_FEATURE_ENABLE(feature_xxxxx)],[])
49#
50# AX_CONFIG_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
51# HAVE_XXXXX, [Define if you want XXXXX support])
52# AX_CONFIG_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
53# HAVE_YYYYY, [Define if you want YYYYY support],
54# [enable_yyyyy="yes"], [enable_yyyyy="no"])
55#
56# ...
57#
58# NOTE: AX_CONFIG_FEATURE_ENABLE() must be placed first of the relative
59# AX_CONFIG_FEATURE() macro ...
60#
61# LICENSE
62#
63# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
64#
65# This program is free software; you can redistribute it and/or modify it
66# under the terms of the GNU General Public License as published by the
67# Free Software Foundation; either version 2 of the License, or (at your
68# option) any later version.
69#
70# This program is distributed in the hope that it will be useful, but
71# WITHOUT ANY WARRANTY; without even the implied warranty of
72# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
73# Public License for more details.
74#
75# You should have received a copy of the GNU General Public License along
76# with this program. If not, see <http://www.gnu.org/licenses/>.
77#
78# As a special exception, the respective Autoconf Macro's copyright owner
79# gives unlimited permission to copy, distribute and modify the configure
80# scripts that are the output of Autoconf when processing the Macro. You
81# need not follow the terms of the GNU General Public License when using
82# or distributing such scripts, even though portions of the text of the
83# Macro appear in them. The GNU General Public License (GPL) does govern
84# all other use of the material that constitutes the Autoconf Macro.
85#
86# This special exception to the GPL applies to versions of the Autoconf
87# Macro released by the Autoconf Archive. When you make and distribute a
88# modified version of the Autoconf Macro, you may extend this special
89# exception to the GPL to apply to your modified version as well.
90
91#serial 10
92
93AC_DEFUN([AX_CONFIG_FEATURE],[ dnl
94m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
95
96AC_ARG_ENABLE([$1],AS_HELP_STRING([--enable-$1],[$2]),[
97case "${enableval}" in
98 yes)
99 ax_config_feature_[]FEATURE[]="yes"
100 ;;
101 no)
102 ax_config_feature_[]FEATURE[]="no"
103 ;;
104 *)
105 AC_MSG_ERROR([bad value ${enableval} for feature --$1])
106 ;;
107esac
108])
109
110AS_IF([test "$ax_config_feature_[]FEATURE[]" = yes],[ dnl
111 AC_DEFINE([$3])
112 $5
113 AS_IF([test "$ax_config_feature_verbose" = yes],[ dnl
114 AC_MSG_NOTICE([Feature $1 is enabled])
115 ])
116],[ dnl
117 $6
118 AS_IF([test "$ax_config_feature_verbose" = yes],[ dnl
119 AC_MSG_NOTICE([Feature $1 is disabled])
120 ])
121])
122
123AH_TEMPLATE([$3],[$4])
124
125m4_popdef([FEATURE])dnl
126])
127
128dnl Feature global
129AC_DEFUN([AX_CONFIG_FEATURE_VERBOSE],[ dnl
130 ax_config_feature_verbose=yes
131])
132
133dnl Feature global
134AC_DEFUN([AX_CONFIG_FEATURE_SILENT],[ dnl
135 ax_config_feature_verbose=no
136])
137
138dnl Feature specific
139AC_DEFUN([AX_CONFIG_FEATURE_DEFAULT_ENABLED], [
140 ax_config_feature_[]FEATURE[]_default=yes
141])
142
143dnl Feature specific
144AC_DEFUN([AX_CONFIG_FEATURE_DEFAULT_DISABLED], [
145 ax_config_feature_[]FEATURE[]_default=no
146])
147
148dnl Feature specific
149AC_DEFUN([AX_CONFIG_FEATURE_ENABLE],[ dnl
150 ax_config_feature_[]patsubst([$1], -, _)[]=yes
151])
152
153dnl Feature specific
154AC_DEFUN([AX_CONFIG_FEATURE_DISABLE],[ dnl
155 ax_config_feature_[]patsubst([$1], -, _)[]=no
156])
157
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