| 1 | # AM_AUX_DIR_EXPAND -*- Autoconf -*-
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| 2 |
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| 3 | # Copyright (C) 2001, 2003, 2005 Free Software Foundation, Inc.
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| 4 | #
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| 5 | # This file is free software; the Free Software Foundation
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| 6 | # gives unlimited permission to copy and/or distribute it,
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| 7 | # with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | # For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
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| 10 | # $ac_aux_dir to `$srcdir/foo'. In other projects, it is set to
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| 11 | # `$srcdir', `$srcdir/..', or `$srcdir/../..'.
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| 12 | #
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| 13 | # Of course, Automake must honor this variable whenever it calls a
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| 14 | # tool from the auxiliary directory. The problem is that $srcdir (and
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| 15 | # therefore $ac_aux_dir as well) can be either absolute or relative,
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| 16 | # depending on how configure is run. This is pretty annoying, since
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| 17 | # it makes $ac_aux_dir quite unusable in subdirectories: in the top
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| 18 | # source directory, any form will work fine, but in subdirectories a
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| 19 | # relative path needs to be adjusted first.
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| 20 | #
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| 21 | # $ac_aux_dir/missing
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| 22 | # fails when called from a subdirectory if $ac_aux_dir is relative
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| 23 | # $top_srcdir/$ac_aux_dir/missing
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| 24 | # fails if $ac_aux_dir is absolute,
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| 25 | # fails when called from a subdirectory in a VPATH build with
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| 26 | # a relative $ac_aux_dir
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| 27 | #
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| 28 | # The reason of the latter failure is that $top_srcdir and $ac_aux_dir
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| 29 | # are both prefixed by $srcdir. In an in-source build this is usually
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| 30 | # harmless because $srcdir is `.', but things will broke when you
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| 31 | # start a VPATH build or use an absolute $srcdir.
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| 32 | #
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| 33 | # So we could use something similar to $top_srcdir/$ac_aux_dir/missing,
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| 34 | # iff we strip the leading $srcdir from $ac_aux_dir. That would be:
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| 35 | # am_aux_dir='\$(top_srcdir)/'`expr "$ac_aux_dir" : "$srcdir//*\(.*\)"`
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| 36 | # and then we would define $MISSING as
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| 37 | # MISSING="\${SHELL} $am_aux_dir/missing"
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| 38 | # This will work as long as MISSING is not called from configure, because
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| 39 | # unfortunately $(top_srcdir) has no meaning in configure.
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| 40 | # However there are other variables, like CC, which are often used in
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| 41 | # configure, and could therefore not use this "fixed" $ac_aux_dir.
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| 42 | #
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| 43 | # Another solution, used here, is to always expand $ac_aux_dir to an
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| 44 | # absolute PATH. The drawback is that using absolute paths prevent a
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| 45 | # configured tree to be moved without reconfiguration.
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| 46 |
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| 47 | AC_DEFUN([AM_AUX_DIR_EXPAND],
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| 48 | [dnl Rely on autoconf to set up CDPATH properly.
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| 49 | AC_PREREQ([2.50])dnl
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| 50 | # expand $ac_aux_dir to an absolute path
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| 51 | am_aux_dir=`cd $ac_aux_dir && pwd`
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| 52 | ])
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