Hello!

It looks like "loaddefs-generate--file-load-name" hangs when it receives
a path starting with "c:/".

Looking at the code, it seems like the very first loop, which
eats the path piece by piece with (file-name-directory name) never
terminates as (file-name-directory-name "c:/") returns "c:/".

In GNU Emacs 29.0.50 (build 1, x86_64-w64-mingw32)
Repository revision: c618a2258cb85e4297304156ccb4c8dbb4fc984a
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.22621
System Description: Microsoft Windows 10 Enterprise (v10.0.2009.22621.819)

Configured using:
'configure --prefix=/d/a/emacs-build/emacs-build/pkg/master-x86_64
'CFLAGS=-Ofast -fno-finite-math-only -fomit-frame-pointer'
--with-native-compilation --with-zlib --with-xpm --with-xml2
--with-tree-sitter --without-tiff --with-rsvg --with-png --with-lcms2
--with-json --with-jpeg --with-harfbuzz --with-gnutls --with-gif
--without-cairo --disable-build-details --without-dbus
--with-compress-install --with-small-ja-dic'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Fundamental

Minor modes in effect:
  global-auto-revert-mode: t
  global-hl-line-mode: t
  global-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
  column-number-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util 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 time cl-extra
help-mode straight info autoload loaddefs-gen generate-lisp-file
radix-tree lisp-mnt easy-mmode cl-seq pcase subr-x byte-opt cl-macs gv
bytecomp byte-compile advice autorevert filenotify cl-loaddefs cl-lib
hl-line rmc iso-transl tooltip cconv eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode 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 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 nadvice seq simple cl-generic
indonesian philippine 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 abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads w32notify w32 lcms2 multi-tty
make-network-process native-compile emacs)

Memory information:
((conses 16 69536 67736)
(symbols 48 8376 0)
(strings 32 24966 24386)
(string-bytes 1 827292)
(vectors 16 15567)
(vector-slots 8 303325 101908)
(floats 8 35 128)
(intervals 56 213 53)
(buffers 992 12))