ax_config_feature
=================

Synopsis
********

     AX_CONFIG_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION, DEFINE, DEFINE-DESCRIPTION, [ACTION-IF-ENABLED [, ACTION-IF-NOT-ENABLED]])

Description
***********

AX_CONFIG_FEATURE is a simple wrapper for AC_ARG_ENABLE, it enables the feature FEATURE-NAME and AC_DEFINEs the passed DEFINE, depending on the user choice. DESCRIPTION will be used for AC_DEFINEs. ACTION-IF-ENABLED and ACTION-IF-NOT-ENABLED are the actions that will be run. A feature is enabled by default, in order to change this behaviour use the AX_CONFIG_FEATURE_DEFAULT_ENABLED and AX_CONFIG_FEATURE_DEFAULT_DISABLED macros.

A simple example:

       AX_CONFIG_FEATURE_DEFAULT_ENABLED
       AX_CONFIG_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
                         HAVE_XXXXX, [Define if you want XXXXX support])

       ...

       AX_CONFIG_FEATURE_DEFAULT_DISABLED
       AX_CONFIG_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
                         HAVE_YYYYY, [Define if you want YYYYY support],
                         [enable_yyyyy="yes"], [enable_yyyyy="no"])
       AM_CONDITIONAL(YYYYY, [test "$enable_yyyyy" = "yes"])

       AX_CONFIG_FEATURE_DEFAULT_ENABLED
       AX_CONFIG_FEATURE(...)

       ...

If you have lot of features and you want a verbose dumping of each user selection use AX_CONFIG_FEATURE_VERBOSE. Use AX_CONFIG_FEATURE_SILENT in order to remove a previously AX_CONFIG_FEATURE_VERBOSE. By default features are silent.

Use AX_CONFIG_FEATURE_ENABLE or AX_CONFIG_FEATURE_DISABLE in order to enable or disable a specific feature.

Another simple example:

       AS_IF([some_test_here],[AX_CONFIG_FEATURE_ENABLE(feature_xxxxx)],[])

       AX_CONFIG_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
                         HAVE_XXXXX, [Define if you want XXXXX support])
       AX_CONFIG_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
                         HAVE_YYYYY, [Define if you want YYYYY support],
                         [enable_yyyyy="yes"], [enable_yyyyy="no"])

       ...

NOTE: AX_CONFIG_FEATURE_ENABLE() must be placed first of the relative AX_CONFIG_FEATURE() macro ...

Source Code
***********

Download the latest version of ax_config_feature.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_config_feature.m4) or browse the macro's revision history (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_config_feature.m4).

License
*******

Copyright © 2008 Francesco Salvestrini salvestrini@users.sourceforge.net

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.

As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts, even though portions of the text of the Macro appear in them. The GNU General Public License (GPL) does govern all other use of the material that constitutes the Autoconf Macro.

This special exception to the GPL applies to versions of the Autoconf Macro released by the Autoconf Archive. When you make and distribute a modified version of the Autoconf Macro, you may extend this special exception to the GPL to apply to your modified version as well.