ax_subst_with
=============

Synopsis
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     AX_SUBST_WITH([varname])

Description
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a very simple macro but also very helpful - the varname is usually the one from an AC_ARG_ENABLE or AC_ARG_WITH option. it is transliterated into uppercase and a prefix WITH_ and WITHOUT_ that are both _SUBSTed.

Only one of these is set to "#" while the other is empty. In other words a call like AC_WITHNONE(enable-call) will create two SUBST-symbols as WITH_ENABLE_CALL and WITHOUT_ENABLE_CALL. When the varname had been set to something not "no" or "0" or ":" or "false" then it results in

      WITH_ENABLE_CALL="" ; WITHOUT_ENABLE_CALL="#"

which you can use in your Makefile quite easily as if using an AM_CONDITIONAL but which can be also parsed by normal make

USE = @WITH_ENABLE_CALL@ -Denabled USE = @WITHOUT_ENABLE_CALL@ -Dnot_enabled

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

License
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Copyright © 2008 Guido U. Draheim guidod@gmx.de

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 3 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.