Re: [PATCH 2/2] Enable 'make CONFIG_FOO=y oldconfig'

From: Michal Marek
Date: Tue Aug 09 2011 - 10:14:16 EST

On 31.7.2011 02:05, Arnaud Lacombe wrote:

On Sat, Jul 30, 2011 at 7:53 PM, H. Peter Anvin<hpa@xxxxxxxxx> wrote:
On 07/30/2011 04:44 PM, Arnaud Lacombe wrote:

Beside that, the one thing I dislike with your patch is that it is
unconditional and global to all symbols, and you have no way to forbid
the environment to override a value.


Because kconfig might not be ran exclusively from a fully controlled
and restricted environment ? Not to mention that it is used by other
people than the linux kernel folks.

Well, it has always been possible to trick kbuild (not kconfig) into accepting CONFIG_* options from environment, because unset kconfig options in auto.conf are not seen by make. Of course this is completely fragile, because there is no dependency checking and such variables are only seen by make and do not appear in autoconf.h. So a patch that teaches kconfig to read options from the environment would actually make some (albeit currently "illegal") use cases work correctly :).

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