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).
next prev 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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