Re: Where is the eln search path defined

[Andrea Corallo <akrl@sdf.org>]

Alex Bennée <alex.bennee@linaro.org> writes:

> Andrea Corallo <akrl@sdf.org> writes:
>
>> Alex Bennée <alex.bennee@linaro.org> writes:
>>
>>> Andrea Corallo <akrl@sdf.org> writes:
>>>
>>>> Alex Bennée <alex.bennee@linaro.org> writes:
>>>>
>>>>> Hi,
>>>>>
>>>>> I thought it was about time I started getting the native-comp branch
>>>>> running on some of my aarch64 machines. The bionic version of libgccjit
>>>>> for aarch64 failed so I ended up having to build the latest from master
>>>>> and adding it to the search path.
>>>>>
>>>>> Emacs seems to have built fine but when I run it I get:
>>>>>
>>>>>   08:41:58 [alex@qemu-test:~/s/emacs] $ emacs -nw
>>>>>   emacs: /usr/bin/../lisp/eln-aarch64-unknown-linux-gnu-e59b16aa72ffe0cd/custom.eln: cannot open shared object file: No such file or directory
>>> <snip>
>>>>> Any pointers?
>>>>
>>>> Hi Alex,
>>>>
>>>> Emacs thinks the binary is installed in '/usr/bin/' and the relative path
>>>> to find the eln from there is expected to be
>>>> '../lisp/eln-aarch64-unknown-linux-gnu-e59b16aa72ffe0cd/custom.eln'.
>>>
>>> Hmm it was configured:
>>>
>>>   ./configure --prefix=/home/alex/src/emacs/install \
>>>               --with-x-toolkit=no --with-modules \
>>>               --with-nativecomp --with-xpm=ifavailable \
>>>               --with-gif=ifavailable --with-tiff=ifavailable
>>
>> Mmh I see.  Would be interesting if you could check the DESTDIR value
>> (if any) in your build environment.
>
> Definitely not in env:
>
>   19:55:42 [alex@qemu-test:~/s/e/emacs.git] native-comp|✔ + env | grep DESTDIR
>   19:56:31 [alex@qemu-test:~/s/e/emacs.git] native-comp|✔ 1 +
>
>>>> I believe of the two information the first is wrong in this case.  This
>>>> is coming from the DESTDIR value while compiling.  Is it possible that
>>>> Emacs was compiled with a certain DESTDIR value and then installed using
>>>> a different one?
>>>
>>> I can't quite follow where the automake magic sets DESTDIR but in the
>>> main Makefile I certainly have:
>>>
>>>   # The default location for installation.  Everything is placed in
>>>   # subdirectories of this directory.  The default values for many of
>>>   # the variables below are expressed in terms of this one, so you may
>>>   # not need to change them.  This defaults to /usr/local.
>>>   prefix=/home/alex/src/emacs/install
>>>
>>> Where is DESTDIR defined during the build?
>>
>> That is a very good question.
>
> I can't see it set, although LISP and BIN DESTDIRS are set:
>
>   19:58:13 [alex@qemu-test:~/s/e/emacs.git] native-comp|✔ + remake
>   remake -C lib all
>   remake[1]: Entering directory '/home/alex/src/emacs/emacs.git/lib'
>   remake[1]: Nothing to be done for 'all'.
>   remake[1]: Leaving directory '/home/alex/src/emacs/emacs.git/lib'
>   remake -C lib-src all
>   remake[1]: Entering directory '/home/alex/src/emacs/emacs.git/lib-src'
>   remake[1]: Nothing to be done for 'all'.
>   remake[1]: Leaving directory '/home/alex/src/emacs/emacs.git/lib-src'
>   remake -C src VCSWITNESS='$(srcdir)/../.git/logs/HEAD' BIN_DESTDIR='/home/alex/src/emacs/install/bin/' \
>            LISP_DESTDIR='/home/alex/src/emacs/install/share/emacs/28.0.50/lisp/' all
>   remake[1]: Entering directory '/home/alex/src/emacs/emacs.git/src'

Regardless the DESTDIRS Unix mystery (!?) BIN_DESTDIR and LISP_DESTDIR
are set correctly.  But looking at you original error apparently Emacs
is convinced to start from '/usr/bin/' and not
'/home/alex/src/emacs/install/bin/'.

This '/usr/bin/' should be the value of `invocation-directory' while
executing pdumper.c:5312.  Is this value wrong or we are missing
something else?

  Andrea
  
-- 
akrl@sdf.org