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From: Brian Dessent <brian@dessent.net>
To: gcc-help@gcc.gnu.org
Subject: Re: Symbols which were not used, still in binary
Date: Wed, 28 Jun 2006 20:17:00 -0000	[thread overview]
Message-ID: <44A2E3D6.F0A78450@dessent.net> (raw)
In-Reply-To: <44A2DF65.8010704@web.de>

Steve Kreyer wrote:

> I have compiled the follwing code with the command ''gcc file.c''
>
> ...
> 
> Neither is it used in this piece of code, nor is it compiled into an
> object file,
> so in my opinion it should be optimized away by gcc.
> So perhaps anybody can tell me whats wrong with my thought...

First of all, if you just type "gcc file.c" then you have not enabled
any optimization at all.  You have to supply -O2 (or -Os, -O1, etc.) if
you want the compiler to perform optimization, as the default is -O0.

That aside, the function won't be eliminated until it's declared
"static", as some other module could still call it.

Brian

  reply	other threads:[~2006-06-28 20:17 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-06-28 19:58 Steve Kreyer
2006-06-28 20:17 ` Brian Dessent [this message]
2006-06-28 21:21   ` Steve Kreyer
2006-06-28 20:17 ` Michael Eager
2006-06-28 21:20   ` Brian Dessent
2006-06-29  5:16     ` Ingo Krabbe

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