Eli Zaretskii <eliz@gnu.org> writes:

>> From: pierre.techoueyres@free.fr (Pierre Téchoueyres)
>> Cc: 33250@debbugs.gnu.org
>> Date: Sat, 03 Nov 2018 17:30:43 +0100
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> >> 
>> >> I'm attaching the trace file of compilation output.
>> >> [...]
>> >>   GEN      ../etc/DOC
>> >> loaddefs.el: No such file or directory
>> >> make[1]: *** [Makefile:559: ../etc/DOC] Error 1
>> >
>> > I think the above is the root cause.  Where's loaddefs.el being
>> > generated?
>> >
>> 
>> I'm unable to find the file.
>> I tried with the following command:
>> find . -iname loaddefs.el in my ~/Travail/VCS/Emacs/emacs/emacs-26  directory
>> It seems the generation of this file has failed.
>
> Then Emacs should have loaded ldefs-boot.el instead, and I see in your
> trace that it did.
>
> Is your source tree clean?  Or was it used for another in-tree build?
It's clean, and i also re-created the build-26 directory

Here is the result of git status: