[PATCH] kbuild: add KBUILD_DEFCONFIG

[Masahiro Yamada]

On Tue, 13 Jan 2015 09:02:58 +0100
Sascha Hauer <s.hauer at pengutronix.de> wrote:

> On Tue, Jan 13, 2015 at 04:54:47PM +0900, Masahiro Yamada wrote:
> > Hi Jean-Christophe,
> > 
> > On Tue, 13 Jan 2015 14:53:19 +0800
> > Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com> wrote:
> > 
> > > 
> > > > On Jan 13, 2015, at 2:46 PM, Masahiro Yamada <yamada.m at jp.panasonic.com> wrote:
> > > > 
> > > > This allows "make ARCH=... defconfig".
> > > > 
> > > > Fox example, you can type "make defconfig" instead of
> > > > "make sandbox_defconfig".
> > > > 
> > > > Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
> > > > ---
> > > > 
> > > > arch/arm/Makefile      | 1 +
> > > > arch/blackfin/Makefile | 1 +
> > > > arch/efi/Makefile      | 2 ++
> > > > arch/nios2/Makefile    | 2 ++
> > > > arch/openrisc/Makefile | 2 ++
> > > > arch/sandbox/Makefile  | 1 +
> > > > arch/x86/Makefile      | 2 ++
> > > > 7 files changed, 11 insertions(+)
> > > > 
> > > > diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> > > > index f06e2a0..9dd983b 100644
> > > > --- a/arch/arm/Makefile
> > > > +++ b/arch/arm/Makefile
> > > > @@ -1,3 +1,4 @@
> > > > +KBUILD_DEFCONFIG := versatilepb_defconfig
> > > 
> > > no sure we need a default config on arm and some other
> > > 
> > > I known we use them on the kernel but here it could result in a broken board
> > > if use not carefully
> > > 
> > > for arch that only have 1 defconfig and will only have one maybe
> > > 
> > 
> > Why could it result in a broken board?  (It seems harmless to me.)
> > 
> > I think it is useful at least for Sandbox and some other arches that
> > have only "generic_defconfig".
> > 
> > It is true that KBUILD_DEFCONFIG is not so useful for ARM.
> > If it is not desired for ARM (and Blackfin), we can drop it, of course.
> 
> I think it makes sense on EFI, x86 and sandbox. On the other
> architectures one must know which board to build, so let's do not
> get others the impression that the generic defconfig produces something
> useful. This also includes nios2 and openrisc. For these two only
> one defconfig exists but I think this is more because these
> architectures have very limited usage.
> 

OK, I have posted v2 where only EFI, x86 and sandbox is changed.

Best Regards
Masahiro Yamada