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bug#37499: Wrong location of deps directory when using AC_SUBST

From: Hans-Bernhard Bröker
Subject: bug#37499: Wrong location of deps directory when using AC_SUBST
Date: Tue, 24 Nov 2020 23:24:47 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0

Am 24.11.2020 um 21:09 schrieb Fabrizio Bertocci:
It took me a while to remember what this issue was about... but I managed to get to my old reproducer.

Ok, let me do one step back. The root problem is how do I ensure that paths passed through ./configure command line are valid when building source code under 'src' (for example).

Look at the two attached .tar.gz. and un-tar the one called 'autotool-bug-rel.tar.gz'.
In this project I have:
/proj             <- Here is where is the configure script
/proj/src       <- Here is the source code
/lib               <- This is another location of some lib I want to be able to define through ./configure

Enter the `proj/src` and generate the configure script (./bootstrap.sh or just use autoreconf).

How is that possible, given the configure script is supposed to be in 'proj', not 'proj/src'?

Launch it with:
./configure --with-mylib=../lib

Similar problem here. If you are where you say, in proj/src, that would have to be ../../lib.

So let's assume you meant to say that CWD is 'proj'.

Well, I don't think it was ever meant to be possible that sources lie outside the subtree configure itself is in.

IOW, $(top_srcdir) is, by definition, the location of the ./configure script, and it actually has to be what it says in the name: the _top_ source directory for stuff built by that configure and its resulting Makefile.

The source tree should thus be

proj         configury here
proj/src     sources here
proj/lib     other sources here

This may actually be related to my ancient bug entry #20699.

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