GNU bug report logs - #44128
[feature/native-comp]; When invoking a symlink to the 'emacs' binary Emacs fails to start

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From: Phil Sainty <psainty <at> orcon.net.nz>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 44128 <at> debbugs.gnu.org
Subject: bug#44128: bug#47800: [native-comp] could not resolve realpath of "emacs"
Date: Fri, 16 Apr 2021 17:41:52 +1200

[Message part 1 (text/plain, inline)]

On 16/04/21 3:08 am, Eli Zaretskii wrote (on bug 47800):
> Does the untested patch below fix the problem?

That didn't change the outcomes for me.

I've just tried some very basic debugging with the attached patch
(yours plus some debug output) which gives me the following outputs:


$ cd /tmp

$ ls emacs
ls: cannot access 'emacs': No such file or directory


$ emacs --version
load_pdump_find_executable: candidate: /home/phil/bin/emacs
=> file: /home/phil/bin/emacs
=> (link) realpath: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
load_pdump: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
real_filename( /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50 )
=> realpath: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
set_invocation_vars: emacs
real_filename( emacs )
=> realpath: (null)
emacs: could not resolve realpath of "emacs": No such file or directory


$ mkdir emacs

$ emacs --version
load_pdump_find_executable: candidate: /home/phil/bin/emacs
=> file: /home/phil/bin/emacs
=> (link) realpath: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
load_pdump: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
real_filename( /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50 )
=> realpath: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
set_invocation_vars: emacs
real_filename( emacs )
=> realpath: /tmp/emacs
emacs: /tmp/../native-lisp/28.0.50-abd7aa58/preloaded/window-0d1b8b93-581f9fcd.eln: cannot open shared object file: No such file or directory


$ /home/phil/emacs/native-comp/usr/local/bin/emacs --version
load_pdump: /home/phil/emacs/native-comp/usr/local/bin/emacs
real_filename( /home/phil/emacs/native-comp/usr/local/bin/emacs )
=> realpath: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
set_invocation_vars: /home/phil/emacs/native-comp/usr/local/bin/emacs
real_filename( /home/phil/emacs/native-comp/usr/local/bin/emacs )
=> realpath: /home/phil/emacs/native-comp/usr/local/bin/emacs-28.0.50
GNU Emacs 28.0.50
Copyright (C) 2021 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GNU Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.

[bug47800.patch (text/x-patch, attachment)]

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