linux-kernel - Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections -fdata-sections

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Message-ID: <alpine.DEB.2.00.0904202318540.7725@vinegar-pot.mit.edu>
Date:	Mon, 20 Apr 2009 23:26:38 -0400 (EDT)
From:	Anders Kaseorg <andersk@....EDU>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tim Abbott <tabbott@....edu>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Waseem Daher <wdaher@....edu>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jeff Arnold <jbarnold@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections
 -fdata-sections

On Mon, 20 Apr 2009, Arjan van de Ven wrote:
> an alternative approach would be to have a special build target that
> uses this, but makes a 2nd vmlinux, and then runs a diff on the symbols
> against the regular one... and finds which functions got dropped.
> Some patient soul can then go about and stick in ifdefs and stuff...

We wouldn’t even need a 2nd vmlinux for that.  Once we can compile with 
-ffunction-sections -fdata-sections, we can just ask the linker to print 
the list of unused sections that it removed (--gc-sections 
--print-gc-sections).

Anders
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