GNU bug report logs - #21831
24.5 on Windows; start-process modifies its PROGRAM argument

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#21831: closed (24.5 on Windows; start-process modifies its
 PROGRAM argument)
Date: Wed, 04 Nov 2015 21:03:02 +0000

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Your message dated Wed, 04 Nov 2015 23:01:48 +0200
with message-id <838u6dtr5v.fsf <at> gnu.org>
and subject line Re: bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument
has caused the debbugs.gnu.org bug report #21831,
regarding 24.5 on Windows; start-process modifies its PROGRAM argument
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Cornelius Mika <cornelius.mika <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5 on Windows; start-process modifies its PROGRAM argument
Date: Wed, 4 Nov 2015 21:31:55 +0100

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start-process normalizes the given PROGRAM path by destructively modifying
its contents.
This is problematic if the path variable is reused later on.

Minimal repro:
(let ((path "c:/Windows/System32/clip.exe"))
  (start-process "" nil path)
  path) ; => "c:\\Windows\\System32\\clip.exe"

In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.3.9600
Configured using:
 `configure --prefix=/c/usr --host=i686-pc-mingw32'

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

Major mode: Lisp Interaction

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  tooltip-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

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For information about GNU Emacs and the GNU system, type C-h C-a.

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Memory information:
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From: Eli Zaretskii <eliz <at> gnu.org>
To: Cornelius Mika <cornelius.mika <at> gmail.com>
Cc: 21831-done <at> debbugs.gnu.org
Subject: Re: bug#21831: 24.5 on Windows;
 start-process modifies its PROGRAM argument
Date: Wed, 04 Nov 2015 23:01:48 +0200

> From: Cornelius Mika <cornelius.mika <at> gmail.com>
> Date: Wed, 4 Nov 2015 21:31:55 +0100
> 
> start-process normalizes the given PROGRAM path by destructively modifying its
> contents.
> This is problematic if the path variable is reused later on.
> 
> Minimal repro:
> (let ((path "c:/Windows/System32/clip.exe"))
> (start-process "" nil path)
> path) ; => "c:\\Windows\\System32\\clip.exe"
> 
> In GNU Emacs 24.5.1 (i686-pc-mingw32)
> of 2015-04-11 on LEG570
> Windowing system distributor `Microsoft Corp.', version 6.3.9600
> Configured using:
> `configure --prefix=/c/usr --host=i686-pc-mingw32'

Thanks.

I can reproduce this in Emacs 24.5, but not in the current development
sources.  So this problem was already fixed as part of the development
since then, and I see the code which was added to avoid this.

So I'm marking this bug done.

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