bug#47049: [feature/native] macro-expansion cycle when compiling comp.el

[Eli Zaretskii <eliz@gnu.org>]

From: eliz@HOME-C4E4A596F7.i-did-not-set--mail-host-address--so-tickle-me
--text follows this line--
I made some local modifications in comp.el, and used that modified
comp.el for a while (by loading it manually at run time) to debug some
problem.  Then I undid those local modifications of comp.el (by saying
"git checkout") and said "make" to rebuild Emacs.  And I see this:

    ELC      emacs-lisp/comp.elc
  Warning: Eager macro-expansion skipped due to cycle:
      => (load "comp.el") => (macroexpand-all (defalias 'comp-add-call-cstr  )) => (macroexpand (comp-loop-insn-in-block  )) => (load "comp.el")

Why does this happen? could it be that while comp.el was modified it
got native-compiled, and now that inconsistent comp.eln gets in the
way?  Anything I can check to find out the culprit?

In GNU Emacs 28.0.50 (build 26, i686-pc-mingw32)
 of 2021-03-09 built on HOME-C4E4A596F7
Repository revision: 79c83f79c5b618cb9ef5eca7be2245f15ff54626
Repository branch: feature/native-comp
Windowing system distributor 'Microsoft Corp.', version 5.1.2600
System Description: Microsoft Windows XP Service Pack 3 (v5.1.0.2600)

Configured using:
 'configure -C --prefix=/d/usr --with-wide-int --with-native-compilation
 --enable-checking=yes,glyphs 'CFLAGS=-O0 -gdwarf-4 -g3''

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
XPM ZLIB

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1255

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-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
  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 epg-config gnus-util rmail
rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map text-property-search time-date
subr-x seq byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel dos-w32 ls-lisp disp-table term/w32-win w32-win
w32-vars term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-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 facemenu
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 charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face pcase macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads w32notify
w32 lcms2 multi-tty make-network-process nativecomp emacs)

Memory information:
((conses 16 74162 8424)
 (symbols 48 7913 0)
 (strings 16 22637 2689)
 (string-bytes 1 661551)
 (vectors 16 14091)
 (vector-slots 8 278584 12025)
 (floats 8 24 40)
 (intervals 40 255 60)
 (buffers 888 10))