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@node ax_expand_prefix
@unnumberedsec ax_expand_prefix
@majorheading Synopsis
@smallexample
AX_EXPAND_PREFIX
@end smallexample
@majorheading Description
When $prefix and $exec_prefix are still set to NONE then set them to the
usual default values - being based on $ac_default_prefix. - this macro
can be AC_REQUIREd by other macros that need to compute values for
installation directories. It has been observed that it was done wrong
over and over again, so this is a bit more safe to do.
remember - setting exec_prefix='$@{prefix@}' needs you interpolate
directories multiple times, it is not sufficient to just say
MYVAR="$@{datadir@}/putter" but you do have to run `eval` a few times,
sth. like MYVAR=`eval "echo \"$MYVAR\""` done atleast two times.
The implementation of this macro simply picks up the lines that would be
run at the start of AC_OUTPUT anyway to set the prefix/exec_prefix
defaults. Between AC_INIT and the first command to AC_REQUIRE this macro
you can set the two variables to something explicit instead. Probably,
any command to compute installation directories should be run _after_
AM_INIT_AUTOMAKE
@majorheading Source Code
Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_expand_prefix.m4,latest
version of @file{ax_expand_prefix.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_expand_prefix.m4,the
macro's revision history}.
@majorheading License
@w{Copyright @copyright{} 2008 Guido U. Draheim @email{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.
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