linux-kernel - Immortal CONFIG_DEBUG

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Message-ID: <20081116074201.GA27921@x200.localdomain>
Date:	Sun, 16 Nov 2008 10:42:01 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	viro@...IV.linux.org.uk, sam@...nborg.org, zippel@...ux-m68k.org
Cc:	linux-kernel@...r.kernel.org
Subject: Immortal CONFIG_DEBUG_INFO=y

As known to everybody doing fat builds, banning DEBUG_INFO=y is mandatory,
otherwise build is slower and takes much more disk space. And to not
accidently enable it, banning it in kconfig:

	@@ -475,7 +475,7 @@ config DEBUG_BUGVERBOSE

	 config DEBUG_INFO
	 	bool "Compile the kernel with debug info"
	-	depends on DEBUG_KERNEL
	+	depends on DEBUG_KERNEL && DISABLED
	 	help
	           If you say Y here the resulting kernel image will include
	 	  debugging info resulting in a larger kernel image.

This works pretty well -- allmodconfig generates config without DEBUG_INFO and
so on, defconfigs also regenerated without it, even if original one in arch/
has DEBUG_INFO enabled and so on. Trick also works for other options, like,
KALLSYMS_EXTRA_PASS.

Except one case:

	make ARCH=sh magicpanelr2_defconfig

DEBUG_INFO survives to .config and resulting build runs with -g.

Now, DEBUG_INFO correctly dissapeares for all other defconfig.
And it dissapeares in se7721_defconfig case (which has CONFIG_DEBUG_KERNEL=y
_and_ CONFIG_DEBUG_INFO=y)

All other options I ban and enable (LOCALVERSION_AUTO, KALLSYMS_EXTRA_PASS,
MODVERSIONS, MODULE_SRCVERSION_ALL, STANDALONE, STAGING) correctly on and off
themselves in all cases.
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