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From: "Drew Adams" <drew.adams@oracle.com>
To: "'Xavier Maillard'" <xma@gnu.org>, <emacs-devel@gnu.org>
Subject: RE: Science to suppress compiler warnings
Date: Tue, 2 Jun 2009 16:57:10 -0700	[thread overview]
Message-ID: <ECDE70B57AE240FC9DBE1F0982FF6DEC@us.oracle.com> (raw)
In-Reply-To: <87fxeigro9.wl%xma@gnu.org>

> (eval-when-compile (defvar foo nil))

(eval-when-compile (defvar foo))

You don't give it a value; you just declare it (to the compiler).

> Warning: reference to free variable `records-link-menu-map'
> Warning: assignment to free variable `records-link-menu-map'
> 
> What is the difference between these two warnings exactly ?

The first means the variable is used (referenced) somehow.
The second means that it is assigned to.

E.g., (setq foo bar) refers to variable `bar', and if it's free, then you get
the first warning. (setq bar 5) assigns `bar' a value, which will give you the
second warning (if `bar' is free).





  parent reply	other threads:[~2009-06-02 23:57 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-02 23:08 Science to suppress compiler warnings Xavier Maillard
2009-06-02 23:36 ` Davis Herring
2009-06-03  8:58   ` Xavier Maillard
2009-06-02 23:57 ` Drew Adams [this message]
2009-06-03  0:51   ` Lennart Borgman
2009-06-03  5:35   ` Stefan Monnier
2009-06-03  9:04     ` Xavier Maillard
2009-06-03 17:33       ` Stefan Monnier
2009-06-03 14:11     ` Drew Adams
2009-06-03  8:40   ` Andreas Schwab
2009-06-03 12:26     ` Xavier Maillard
2009-06-03  8:59   ` Xavier Maillard
2009-06-03  4:43 ` Stephen J. Turnbull
2009-06-03  9:58   ` Lennart Borgman

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