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Subject: bug#67540: 29.1; Emacs on Windows incorrectly capitalizes some environment  variables
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emacs -Q
M-! set

Now issue the "set" command from a CMD shell. Notice that the "Path"
environment variable has been renamed to "PATH" in Emacs.  This renaming
interferes with some tools operating correctly e.g. the swift compiler
(see https://swift.org).

I notice that the "ComSpec" variable is getting the same treatment

I am able to work around the problem as follows:

(defun unsetenv (var-name)
  (let ((current-prefix-arg '(4)))
	(funcall-interactively 'setenv var-name nil)))

(when (eq system-type 'windows-nt)
  (dolist (v '("Path" "ComSpec"))
          (let ((x (getenv v)))
               (unsetenv (upcase v))
               (setenv v x))))


In GNU Emacs 29.1 (build 2, x86_64-w64-mingw32) of 2023-08-02 built on
AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.22621
System Description: Microsoft Windows 10 Pro (v10.0.2009.22621.2715)

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Dave Abrahams <dave@HIDDEN>
Subject: bug#67540: Acknowledgement (29.1; Emacs on Windows incorrectly
 capitalizes some environment  variables)
Message-ID: <handler.67540.B.170131140222540.ack <at> debbugs.gnu.org>
References: <4447B955-7BC6-4641-B65D-F674D796B86E@HIDDEN>
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#67540: 29.1; Emacs on Windows incorrectly capitalizes some environment variables
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On 11/29/2023 6:29 PM, Dave Abrahams wrote:
> Now issue the "set" command from a CMD shell. Notice that the "Path"
> environment variable has been renamed to "PATH" in Emacs.  This renaming
> interferes with some tools operating correctly e.g. the swift compiler
> (see https://swift.org).

This sounds like there's a bug in the Swift compiler. Environment 
variables on MS-Windows are case-insensitive: 
<https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/getenv-wgetenv?view=msvc-170>. 
That documentation just covers 'getenv' (and 'wgetenv'), but I'm 
reasonably certain the same applies to the Win32 APIs as well.

It might be nice for Emacs to preserve the case of any existing 
environment variables on MS-Windows to be on the safe side though...

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#67540: 29.1; Emacs on Windows incorrectly capitalizes some environment  variables
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Thu, 30 Nov 2023 09:10:43 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <4447B955-7BC6-4641-B65D-F674D796B86E@HIDDEN> (message from
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tags 67540 wontfix
thanks

> From: Dave Abrahams <dave@HIDDEN>
> Date: Wed, 29 Nov 2023 18:29:26 -0800
> 
> 
> 
> emacs -Q
> M-! set
> 
> Now issue the "set" command from a CMD shell. Notice that the "Path"
> environment variable has been renamed to "PATH" in Emacs.  This renaming
> interferes with some tools operating correctly e.g. the swift compiler
> (see https://swift.org).

You are saying that the swift compiler doesn't recognize "PATH"?  If
so, it's a bug in the swift compiler, since look up of environment
variables by cmd.exe at least is case-insensitive on Windows, and I
have yet to see a Windows program which doesn't do the same.  I
suggest reporting a bug against swift.

We cannot avoid up-casing Path and ComSpec in Emacs because that would
break many places in Emacs that assume they are spelled in CAPS.
(Obviously, PATH is much more critical than COMSPEC, but still.)  And
Emacs Lisp programs don't compare these variables case-insensitively.

So if swift and some other programs must have Path and not PATH, my
suggestion is to perform the letter-case changes when you invoke those
programs, and them alone, as doing that globally in Emacs will cause
problems elsewhere.

Message received at control <at> debbugs.gnu.org:

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Date: Thu, 30 Nov 2023 09:10:43 +0200
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To: Dave Abrahams <dave@HIDDEN>
In-Reply-To: <4447B955-7BC6-4641-B65D-F674D796B86E@HIDDEN> (message from
 Dave Abrahams on Wed, 29 Nov 2023 18:29:26 -0800)
Subject: Re: bug#67540: 29.1;
 Emacs on Windows incorrectly capitalizes some environment  variables
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tags 67540 wontfix
thanks

> From: Dave Abrahams <dave@HIDDEN>
> Date: Wed, 29 Nov 2023 18:29:26 -0800
> 
> 
> 
> emacs -Q
> M-! set
> 
> Now issue the "set" command from a CMD shell. Notice that the "Path"
> environment variable has been renamed to "PATH" in Emacs.  This renaming
> interferes with some tools operating correctly e.g. the swift compiler
> (see https://swift.org).

You are saying that the swift compiler doesn't recognize "PATH"?  If
so, it's a bug in the swift compiler, since look up of environment
variables by cmd.exe at least is case-insensitive on Windows, and I
have yet to see a Windows program which doesn't do the same.  I
suggest reporting a bug against swift.

We cannot avoid up-casing Path and ComSpec in Emacs because that would
break many places in Emacs that assume they are spelled in CAPS.
(Obviously, PATH is much more critical than COMSPEC, but still.)  And
Emacs Lisp programs don't compare these variables case-insensitively.

So if swift and some other programs must have Path and not PATH, my
suggestion is to perform the letter-case changes when you invoke those
programs, and them alone, as doing that globally in Emacs will cause
problems elsewhere.

Last modified: Thu, 30 Nov 2023 07:15:02 UTC

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