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Re: [h-e-w] Emacs and Windows PATH variable

From: Eli Zaretskii
Subject: Re: [h-e-w] Emacs and Windows PATH variable
Date: Wed, 05 Mar 2014 19:31:46 +0200

> From: Stephen Leake <address@hidden>
> Cc: Nikolay Kudryavtsev <address@hidden>,  address@hidden
> Date: Tue, 04 Mar 2014 18:12:14 -0600
> Eli Zaretskii <address@hidden> writes:
> > In general, there's no way I know of to change PATH inside a running
> > program (in this case Emacs), except by restarting it.  
> You don't need to change the PATH of the Emacs process. You need to
> change the PATH that emacs passes to processes it spawns. That's what
> `exec-path' is for:
>   (setq exec-path
>         (list
>          (expand-file-name "~/bin")
>          (concat "/Apps/GNAT-" (getenv "GNAT_VERSION") "/bin")
>        (concat (getenv "ANDROID_HOME") "/tools")
>        (concat (getenv "ANDROID_HOME") "/platform-tools")
>        "c:/Program Files (x86)/Java/jdk1.7.0_05/bin"
>        (concat (getenv "ANT_HOME") "/bin")
>        (or
>         (getenv "EMACS_BIN") ;; emacs 23.2
>         (getenv "EMACSPATH") ;; ?
>         (concat (getenv "emacs_dir") "/bin") ;; emacs 24.3
>         )
>          "c:/Projects/monotone/monotone-build_mingw" ; working version
> ;         "c:/MinGW/bin" ; dlls for new mtn version
> ;         "c:/Apps/monotone-1.0" ; current version; dlls
>          "c:/Apps/monotone-1.0.90" ; testing version; newer dlls
>          "c:/Apps/Inno_Setup_5.4.3"
>          "c:/bin"
>          "c:/WINDOWS/system32"))
>   (setenv "PATH" (mapconcat 'identity  exec-path  path-separator))

Not recommended to the faint at heart: how do you know for certain
that Emacs's own value of PATH (as opposed to exec-path and
process-environment), which is now different from these two, is not
used anywhere?

In any case, note that you are pushing directories onto PATH with
forward slashes.  Some (rare) programs don't like that, so caveat

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