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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: how to embed the current buffer name into the compile-comand
Date: Sat, 04 Aug 2007 12:44:24 +0300
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> From: sunway <sunwayforever@gmail.com>
> Date: Fri, 03 Aug 2007 18:03:28 -0700
> 
> (setq compile-command (concat (concat "g++ -Wall " (buffer-file-name))
> " &&./a.out"))

There's no need for nested `concat' invocations: `concat' accepts any
number of arguments, not just 2.

See the doc string of `concat' for more details.