53 lines
2.4 KiB
Plaintext
53 lines
2.4 KiB
Plaintext
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# AM_AUX_DIR_EXPAND -*- Autoconf -*-
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# Copyright (C) 2001-2013 Free Software Foundation, Inc.
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#
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
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# $ac_aux_dir to '$srcdir/foo'. In other projects, it is set to
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# '$srcdir', '$srcdir/..', or '$srcdir/../..'.
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#
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# Of course, Automake must honor this variable whenever it calls a
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# tool from the auxiliary directory. The problem is that $srcdir (and
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# therefore $ac_aux_dir as well) can be either absolute or relative,
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# depending on how configure is run. This is pretty annoying, since
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# it makes $ac_aux_dir quite unusable in subdirectories: in the top
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# source directory, any form will work fine, but in subdirectories a
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# relative path needs to be adjusted first.
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#
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# $ac_aux_dir/missing
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# fails when called from a subdirectory if $ac_aux_dir is relative
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# $top_srcdir/$ac_aux_dir/missing
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# fails if $ac_aux_dir is absolute,
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# fails when called from a subdirectory in a VPATH build with
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# a relative $ac_aux_dir
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#
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# The reason of the latter failure is that $top_srcdir and $ac_aux_dir
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# are both prefixed by $srcdir. In an in-source build this is usually
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# harmless because $srcdir is '.', but things will broke when you
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# start a VPATH build or use an absolute $srcdir.
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#
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# So we could use something similar to $top_srcdir/$ac_aux_dir/missing,
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# iff we strip the leading $srcdir from $ac_aux_dir. That would be:
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# am_aux_dir='\$(top_srcdir)/'`expr "$ac_aux_dir" : "$srcdir//*\(.*\)"`
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# and then we would define $MISSING as
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# MISSING="\${SHELL} $am_aux_dir/missing"
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# This will work as long as MISSING is not called from configure, because
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# unfortunately $(top_srcdir) has no meaning in configure.
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# However there are other variables, like CC, which are often used in
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# configure, and could therefore not use this "fixed" $ac_aux_dir.
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#
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# Another solution, used here, is to always expand $ac_aux_dir to an
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# absolute PATH. The drawback is that using absolute paths prevent a
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# configured tree to be moved without reconfiguration.
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AC_DEFUN([AM_AUX_DIR_EXPAND],
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[dnl Rely on autoconf to set up CDPATH properly.
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AC_PREREQ([2.50])dnl
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# expand $ac_aux_dir to an absolute path
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am_aux_dir=`cd $ac_aux_dir && pwd`
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])
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