linux-kernel - Re: [PATCH] Makefile: allow no update .config build

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Date:	Fri, 29 Mar 2013 08:41:49 +0800
From:	li guang <lig.fnst@...fujitsu.com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	mmarek@...e.cz, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Makefile: allow no update .config build

在 2013-03-28四的 10:13 -0700，Randy Dunlap写道：
> On 03/28/13 00:28, liguang wrote:
> > if we pull some commits from other git repo
> > which bring in a few CONFIG_* options, then
> > we have to build all again, but we do assure
> > these options are not interesting for us,
> > so the long waiting build will be offending.
> > this change help us to avoid all-build.
> > 
> > Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> > ---
> >  Makefile |    9 +++++++++
> >  1 files changed, 9 insertions(+), 0 deletions(-)
> > 
> > diff --git a/Makefile b/Makefile
> > index 54d2b2a..d10e505 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -106,6 +106,12 @@ ifeq ("$(origin W)", "command line")
> >    export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
> >  endif
> >  
> > +# KBUILD_NCU is set to do not update .config even
> > +# a few new CONFIG_* options appeared
> > +ifeq ("$(origin NCU)", "command line")
> > +  KBUILD_NCU := $(NCU)
> > +endif
> > +
> >  # That's our default target when none is given on the command line
> >  PHONY := _all
> >  _all:
> > @@ -540,8 +546,10 @@ $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
> >  # with it and forgot to run make oldconfig.
> >  # if auto.conf.cmd is missing then we are probably in a cleaned tree so
> >  # we execute the config step to be sure to catch updated Kconfig files
> > +ifneq ($(KBUILD_NCU), 1)
> >  include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
> >  	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
> > +endif # $(KBUILD_NCU)
> >  else
> >  # external modules needs include/generated/autoconf.h and include/config/auto.conf
> >  # but do not care if they are up-to-date. Use auto.conf to trigger the test
> > @@ -1157,6 +1165,7 @@ help:
> >  	@echo  '		2: warnings which occur quite often but may still be relevant'
> >  	@echo  '		3: more obscure warnings, can most likely be ignored'
> >  	@echo  '		Multiple levels can be combined with W=12 or W=123'
> > +	@echo  '  make NCU=1 [targets] no .config udate'
> 
> 	                                          update

OK, I'll update.

Thanks!

> 
> >  	@echo  ''
> >  	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
> >  	@echo  'For further info see the ./README file'
> > 
> 
> 


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