linux-kernel - Re: [PATCH 2/7] x86: Add an option to compile with -ffunction-sections -fdata-sections

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Message-ID: <alpine.DEB.2.00.0902041549470.32142@vinegar-pot.mit.edu>
Date:	Wed, 4 Feb 2009 15:50:40 -0500 (EST)
From:	Anders Kaseorg <andersk@....EDU>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Jeff Arnold <jbarnold@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Tim Abbott <tabbott@....edu>, Waseem Daher <wdaher@....edu>,
	Nikanth Karthikesan <knikanth@...e.de>
Subject: Re: [PATCH 2/7] x86: Add an option to compile with -ffunction-sections
 -fdata-sections

On Wed, 4 Feb 2009, Rusty Russell wrote:
> Ah, OK, this explanation should probably be in a paragraph in the Kconfig
> help message, rather than hiding on lkml.

Sure.

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c6a2674..3412706 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -602,6 +602,11 @@ config FUNCTION_DATA_SECTIONS
 	  If you say Y here the compiler will give each function
 	  and data structure its own ELF section.

+	  This option conflicts with CONFIG_FUNCTION_TRACER, which
+	  enables profiling code generation, because current GCC does
+	  not support compiling with -ffunction-sections -pg (see
+	  <http://gcc.gnu.org/ml/gcc-help/2008-11/msg00128.html>).
+
 	  If unsure, say N.

 config BOOT_PRINTK_DELAY
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