[Buildroot] [PATCH] support/kconfig: use kconfig-provided way of setting the CONFIG_ prefix
Yann E. MORIN
yann.morin.1998 at free.fr
Tue Apr 16 21:34:24 UTC 2013
Thomas, All,
On Tue, Apr 16, 2013 at 11:06:25PM +0200, Thomas Petazzoni wrote:
> On Sun, 14 Apr 2013 14:53:17 +0200, Yann E. MORIN wrote:
> > It's now been a while since it has been possible to build the kconfig
> > parser to understand a prefix other than CONFIG_, and even no prefix
> > at all, by setting the CONFIG_ macro (#define) at biuld time.
> >
> > Just use that, insted of patching, it will make it easier for us in the
> > future.
>
> I haven't tested your patch nor looked at it carefully. However, I know
> there is a difference between what the kernel does and what Buildroot
> does in terms of Kconfig options.
>
> In a kernel Kconfig file, the option names are not prefixed by
> 'CONFIG_', but when used in Makefiles, they are.
>
> In Buildroot, option names are prefixed with 'BR2_' in both the
> Config.in files and in the Makefiles. Does your change takes this into
> account?
That's the whole point of this patch: use Kconfig ability to understand
any prefix other than the default 'CONFIG_', and even an empty prefix:
-HOST_EXTRACFLAGS += -I$(obj)
+HOST_EXTRACFLAGS += -I$(obj) -DCONFIG_=\"\"
^^^^^^^^^^^^^^
This tells that the option prefix is empty, so:
Config.in .config
--------------------------------------------
config FOO FOO=y
config BR2_BAR # BR2_BAR is not set
If I did use: -DCONFIG_=\"YEM\" , then that would give:
Config.in .config
--------------------------------------------
config FOO YEM_FOO=y
config BR2_BAR # YEM_BR2_BAR is not set
So yes, this patch maintains our do-not-add-a-prefix-to-options policy. ;-)
Regards,
Yann E. MORIN.
PS. It is even possible to override that prefix at runtime, too, but
that's not the path I choose in this patch.
YEM.
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