linux-kernel - Better way to force a rebuild

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Date:	Wed, 10 Dec 2008 14:48:35 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kbuild@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
cc:	zippel@...ux-m68k.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Better way to force a rebuild

Hi,

In include/linux/kernel.h I currently have the following lines at the 
bottom of the file:

/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
#endif

This is only there to force a rebuild of all files when 
CONFIG_FTRACE_MCOUNT_RECORD is modified. Since the modification of that 
config causes the build to act different, we need to rebuild all C 
objects. I added the #ifdef in kernel.h as a hack to force the rebuild by 
the config dependencies used in kbuild.

My question is, is there a better way to force a full rebuild on a 
modification of a config?

Thanks,

-- Steve

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