Re: 'make clean' not working

[Akim Demaille]

> Le 23 sept. 2021 à 09:31, Hans Åberg <haberg-1@telia.com> a écrit :
> 
>> 
>> On 23 Sep 2021, at 07:31, Akim Demaille <akim@lrde.epita.fr> wrote:
>> 
>> Hi Andrea,
>> 
>>> Le 21 sept. 2021 à 16:45, Andrea Monaco <andrea.monaco@autistici.org> a 
>>> écrit :
>>> 
>>> Hello,
>>> 
>>> I'm trying to rebuild a bison-3.8 release tree, but "make clean" aborts
>>> with this error:
>>> 
>>> CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash 
>>> '/root/bison-3.8/build-aux/missing' autoconf
>>> /root/bison-3.8/build-aux/missing: line 81: autoconf: command not found
>>> WARNING: 'autoconf' is missing on your system.
>>>       You should only need it if you modified 'configure.ac',
>>>       or m4 files included by it.
>>>       The 'autoconf' program is part of the GNU Autoconf package:
>>>       <https://www.gnu.org/software/autoconf/>
>>>       It also requires GNU m4 and Perl in order to run:
>>>       <https://www.gnu.org/software/m4/>
>>>       <https://www.perl.org/>
>>> Makefile:3894: recipe for target 'configure' failed
>>> make: *** [configure] Error 127
>>> 
>>> Is it expected?
> …
>> I can't reproduce your problem.  I have run configure, make, make clean,
>> make, without any problem (autoconf was not called).  Maybe something was
>> touched in your tree, I don't know.
> 
> I can reproduce the problem by modifying a file by touching it after the 
> build (tried with an m4 file) and making sure autoconf is not in the PATH.

That's expected: if you touch something that requires Autoconf, of course 
autoconf is fired.

Andrea said he did nothing like that, yet autoconf was called.