bug#52376: 28.0.90; libdir is missing from native-comp-eln-load-path with GTK3 build

[Bhavin Gandhi <bhavin7392@gmail.com>]

I have been trying to build a RPM package for pretest 28.0.90. This
process builds three variants, GTK3, Lucid, and No X.

When I install and start GTK3 based Emacs with emacs -Q, the value of
native-comp-eln-load-path does not have
/usr/lib64/emacs/28.0.90/native-lisp/ in it.

--8<---------------cut here---------------start------------->8---
native-comp-eln-load-path is a variable defined in ‘C source code’.

Its value is
("/home/bhavin/.emacs.d/eln-cache/" "/home/bhavin/src/emacs/native-lisp/")
--8<---------------cut here---------------end--------------->8---

$ ls -ll /usr/lib64/emacs/28.0.90/native-lisp/28.0.90-619a407c/
total 3080
-rw-r--r--. 1 root root  81216 Dec  8 15:14 autoload-f3599901-fca77eea.eln
…

But in case of other two variants Lucid and the No X, the libdir is there.

To isolate the issue I tried following commands with newly extracted
pretest tar:


--8<---------------cut here---------------start------------->8---
$ ./configure --build=x86_64-redhat-linux-gnu
--host=x86_64-redhat-linux-gnu --program-prefix=
--disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
--datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
--libexecdir=/usr/libexec --localstatedir=/var
--sharedstatedir=/var/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-dbus --with-gif --with-jpeg
--with-png --with-rsvg --with-tiff --with-xft --with-xpm
--with-x-toolkit=gtk3 --with-gpm=no --with-xwidgets --with-modules
--with-harfbuzz --with-cairo --with-json --with-native-compilation
$ make -j8 bootstrap
$ make -j8
$ sudo make -j8 install
--8<---------------cut here---------------end--------------->8---

With this installation, the libdir is detected and loaded as well.

I'm not sure where to look and how to debug this issue, I tried
looking at the source code to find places where this variable is set,
but wasn't able to find any code related to libdir. This might not be
a bug, but with my very little knowledge on how Emacs starts and loads
things, I have already ran out of things to try out for this problem.

This behaviour is consistently reproducible, so I should be able to
run commands, give more details, and try any instructions to debug
this. All the build steps, above commands are run in separate and new
containers.



In GNU Emacs 28.0.90 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
3.24.30, cairo version 1.17.4)
 of 2021-12-08 built on toolbox
Repository revision: c4a21caf591131351dab4f26adac00541614fb9f
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Fedora Linux 35 (Container Image)

Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no --with-xwidgets --with-modules --with-harfbuzz
 --with-cairo --with-json --with-native-compilation
 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
 CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2 -flto=auto -ffat-lto-objects
 -fexceptions -g -grecord-gcc-switches -pipe -Wall
 -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LANG: C.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util rmail
rmail-loaddefs auth-source eieio eieio-core eieio-loaddefs
password-cache json map text-property-search time-date mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils comp
comp-cstr warnings subr-x rx cl-seq cl-macs cl-extra help-mode seq
byte-opt gv cl-loaddefs cl-lib bytecomp byte-compile cconv iso-transl
tooltip eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads
xwidget-internal dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo move-toolbar gtk x-toolkit x multi-tty
make-network-process native-compile emacs)

Memory information:
((conses 16 74321 8216)
 (symbols 48 7850 1)
 (strings 32 21907 3978)
 (string-bytes 1 764195)
 (vectors 16 17728)
 (vector-slots 8 256054 16638)
 (floats 8 27 37)
 (intervals 56 304 0)
 (buffers 992 12))