bug#51894: 27.2; GDB Gud support on Cygwin has trouble accessing shared files on Windows network drives.

[Guy Offer via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Working on Cygwin Emacs when source code is located on Windows 10
network drives (e.g. Windows F: drive points to \\fileserver\soruce) and accessed
by gdb using \cygdrive\f\source\.. the Emacs gdb support cannot find the
file.
File can only be find by the Emacs GDB support if the source path begins with
double slash (e.g,, \\cygdrive\f\source\...).  However in this case it
cannot be found by the gud gdb window.
To overcome this source mounts should be done directly from the Cygwin (using mount) and not
through the Windows 10 drives (\cygdrive\...).


In GNU Emacs 27.2 (build 1, x86_64-pc-cygwin, X toolkit, Xaw3d scroll bars)
of 2021-03-26 built on moufang2
Repository revision: 5a2c58d08c59ce5a7afb6511cc99f722f426c12b
Repository branch: master
Windowing system distributor 'The Cygwin/X Project', version 11.0.12012000
Recent messages:
(No changes need to be saved)
elisp--preceding-sexp: End of file during parsing
Saving file /cygdrive/c/Temp/cmd3...
Wrote /cygdrive/c/Temp/cmd3
(No changes need to be saved) [3 times]
Undefined command: "exit".  Try "help".
Switched to thread 1
Mark set
Target doesn't support non-stop mode.  Turning it off.
Mark set [8 times]

Configured using:
'configure
--srcdir=/home/kbrown/src/cygpackages/emacs/emacs-27.2-1.x86_64/src/emacs-27.2
--prefix=/usr --exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc
--docdir=/usr/share/doc/emacs --htmldir=/usr/share/doc/emacs/html -C
--with-x-toolkit=lucid 'CFLAGS=-ggdb -O2 -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-fstack-protector-strong --param=ssp-buffer-size=4
-fdebug-prefix-map=/home/kbrown/src/cygpackages/emacs/emacs-27.2-1.x86_64/build=/usr/src/debug/emacs-27.2-1
-fdebug-prefix-map=/home/kbrown/src/cygpackages/emacs/emacs-27.2-1.x86_64/src/emacs-27.2=/usr/src/debug/emacs-27.2-1'
CPPFLAGS= LDFLAGS='

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY
GFILENOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT
ZLIB TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS JSON PDUMPER
LCMS2 GMP

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Debugger

Minor modes in effect:
  gud-tooltip-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  tab-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 dired dired-loaddefs format-spec
rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs text-property-search mailabbrev gmm-utils mailheader
sendmail mail-utils help-fns radix-tree cl-print debug backtrace
help-mode mule-util jka-compr info vc-git cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs which-func
imenu vc vc-dispatcher tempo srecode soap-client mm-decode mm-bodies
mm-encode url-http url-auth mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr url-gw nsm rmc puny url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
url-parse auth-source url-vars mailcap rng-xsd rng-dt rng-util
xsd-regexp xml smerge-mode sieve sieve-mode sieve-manage sasl
sasl-anonymous sasl-login sasl-plain password-cache pcvs-defs pcvs-util
grep glasses gdb-mi bindat json map gud flymake-proc flymake warnings
thingatpt etags fileloop generator xref project emerge elide-head ediff
ediff-merg ediff-mult ediff-wind ediff-diff ediff-help ediff-init
ediff-util ede/project-am ede/autoconf-edit autoconf autoconf-mode
semantic/find ede/makefile-edit make-mode ede/linux semantic/db
semantic/util-modes semantic/util semantic pp semantic/tag semantic/lex
semantic/fw mode-local find-func ede/make ede/speedbar ede/files ede
ede/detect ede/base ede/auto ede/source eieio-base seq eieio-speedbar
speedbar sb-image ezimage dframe eieio-custom cl-seq eieio byte-opt
bytecomp byte-compile cconv eieio-core cl-macs gv eieio-loaddefs cedet
ebrowse ebuff-menu view diff copyright compile comint ansi-color ring
compare-w diff-mode easy-mmode check-declare calculator edmacro kmacro
add-log time-date subr-x cus-edit easymenu cus-start cus-load wid-edit
cl-loaddefs cl-lib advice tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type 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 elisp-mode lisp-mode prog-mode register page
tab-bar menu-bar rfn-eshadow isearch 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 loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
threads dbusbind gfilenotify lcms2 dynamic-setting system-font-setting
font-render-setting x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 246697 30355)
(symbols 48 21407 1)
(strings 32 65711 3822)
(string-bytes 1 2120737)
(vectors 16 37254)
(vector-slots 8 481354 23754)
(floats 8 118 220)
(intervals 56 3551 198)
(buffers 1000 37))

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