linux-kernel - Re: [PATCH 5/6] create/adjust generated/expsyms.h

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Message-ID: <20160208222448.GC13832@ravnborg.org>
Date:	Mon, 8 Feb 2016 23:24:49 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:	Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 5/6] create/adjust generated/expsyms.h

On Mon, Feb 08, 2016 at 03:28:34PM -0500, Nicolas Pitre wrote:
> Given the list of exported symbols needed by all modules, we can create
> a header file containing preprocessor defines for each of those symbols.
> Also, when some symbols are added and/or removed from the list, we can
> update the time on the corresponding files used as build dependencies for
> those symbols. And finally, if any symbol did change state, the
> corresponding source files must be rebuilt.
> 
> The insertion or removal of an EXPORT_SYMBOL() entry within a module may
> create or remove the need for another exported symbol.  This is why this
> operation has to be repeated until the list of needed exported symbols
> becomes stable. Only then the final kernel and modules link take place.

Could this magic with vmlinux_recursive have been implemented in a more
obvious way in link-vmlinux.sh?
One of the purposes with link-vmlinux.sh was to make the final link
stage more readable and this patch goes in the other direction.

	Sam