Guido U. Draheim <guidod@gmx.de>
GPLWithACException
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cryp.to ac-archive's Miscellaneous (released)
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
AC_DEFUN([AX_EXPAND_PREFIX],[dnl
# The prefix default can be set in configure.ac (otherwise it is /usr/local)
test "x$prefix" = xNONE && prefix=$ac_default_prefix
# Let make expand exec_prefix. Allows to override the makevar 'prefix' later
test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
])