Re[2]: [PATCH 1/2] Makefile: Create empty <config.h> if this header file is not needed by board

[Alexander Shiyan]

> On Fri, Apr 05, 2013 at 02:07:23PM +0400, Alexander Shiyan wrote:
> > > > > On Mon, Mar 11, 2013 at 08:10:49PM +0400, Alexander Shiyan wrote:
> > > > > > Patch creates empty <config.h> if this header is not needed by board.
> > > > > > This will allow to remove many empty config.h files from boards.

Ah, yes. Nice catch. I'll post v2 later.
Just a additional "rm -f $@;" need to be included before "echo".

> > > > > > 
> > > > > > Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
> > > > > > ---
> > > > > >  Makefile | 17 +++++++++++------
> > > > > >  1 file changed, 11 insertions(+), 6 deletions(-)
> > > > > > 
> > > > > > diff --git a/Makefile b/Makefile
> > > > > > index b5819fc..e8d9984 100644
> > > > > > --- a/Makefile
> > > > > > +++ b/Makefile
> > > > > > @@ -898,13 +898,18 @@ include/asm:
> > > > > >  	$(Q)$(check-symlink)
> > > > > >  	$(Q)$(create-symlink)
> > > > > >  
> > > > > > +define symlink-config-h
> > > > > > +	if [ -f $(srctree)/$(BOARD)/config.h ]; then		\
> > > > > > +		$(kecho) '  SYMLINK $@ -> $(BOARD)/config.h';	\
> > > > > > +		ln -fsn $(srctree)/$(BOARD)/config.h $@;	\
> > > > > > +	else							\
> > > > > > +		$(kecho) '  CREATE  $@';			\
> > > > > > +		echo -n > $@;					\
> > > > > > +	fi
> > > > > > +endef
> > > > > 
> > > > > I dropped this patch because it autogenerates files which were
> > > > > previously part of the repository. This causes git checkout to
> > > > > complain about overwriting existing files when we want to checkout
> > > > > earlier versions.
> > > > 
> > > > Patch creates include/config.h (which is in .gitignore) only
> > > > or makes symlink to board/config.h. So all already as you say below.
> > > 
> > > It creates a arch/$arch/$board/config.h, so we get the following:
> > Can you point it in the code?
> > 
> > > 
> > > # git checkout for-next/remove-config-h
> > > ...
> > > # make pcm038_defconfig && make
> > > ...
> > > # git checkout master
> > > error: The following untracked working tree files would be overwritten by checkout:
> > >         arch/arm/boards/pcm038/config.h
> > > Please move or remove them before you can switch branches.
> > > Aborting
> > > 
> > > So this patch forces us to manually remove arch/$arch/$board/config.h
> > > or to use git checkout -f
> > 
> > I am do not understand a problem. For me it works OK.
> > 
> > shc at shc /home/git/bb-test-cfg $ ls arch/arm/boards/pcm038/
> > env  lowlevel.c  Makefile  pcm038.c  pcm038.dox  pcm970.c  pll.h
> > 
> > shc at shc /home/git/bb-test-cfg $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- pcm038_defconfig
> >   HOSTCC  scripts/basic/fixdep
> >   HOSTCC  scripts/basic/docproc
> >   HOSTCC  scripts/kconfig/conf.o
> >   SHIPPED scripts/kconfig/zconf.tab.c
> >   SHIPPED scripts/kconfig/zconf.lex.c
> >   SHIPPED scripts/kconfig/zconf.hash.c
> >   HOSTCC  scripts/kconfig/zconf.tab.o
> > scripts/kconfig/zconf.tab.c: В функции «header_print_comment»:
> > scripts/kconfig/confdata.c:540:10: предупреждение: ignoring return value of «fwrite», declared with attribute warn_unused_result [-Wunused-result]
> > scripts/kconfig/zconf.tab.c: В функции «kconfig_print_comment»:
> > scripts/kconfig/confdata.c:467:10: предупреждение: ignoring return value of «fwrite», declared with attribute warn_unused_result [-Wunused-result]
> >   HOSTLD  scripts/kconfig/conf
> > #
> > # configuration written to .config
> > #
> > 
> > shc at shc /home/git/bb-test-cfg $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
> > scripts/kconfig/conf --silentoldconfig Kconfig
> >   Generating include/generated/mach-types.h
> >   CHK     include/generated/version.h
> >   UPD     include/generated/version.h
> >   CHK     include/generated/utsrelease.h
> >   UPD     include/generated/utsrelease.h
> >   SYMLINK include/asm -> include/asm-arm
> >   CREATE  include/config.h
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >   LD      scripts/built-in.o
> >   CC      scripts/mod/empty.o
> >   HOSTCC  scripts/mod/mk_elfconfig
> >   MKELF   scripts/mod/elfconfig.h
> >   HOSTCC  scripts/mod/modpost.o
> > ^Cmake[2]: *** [scripts/mod/modpost.o] Прерывание
> > make[1]: *** [scripts/mod] Прерывание
> > make: *** [scripts] Прерывание
> > 
> > shc at shc /home/git/bb-test-cfg $ ls arch/arm/boards/pcm038/
> > env  lowlevel.c  Makefile  pcm038.c  pcm038.dox  pcm970.c  pll.h
> > 
> > shc at shc /home/git/bb-test-cfg $ git commit -a
> > # On branch cfg
> > nothing to commit, working directory clean
> > 
> > ...
> > So, no board/config.h. Just a empty include/config.h.
> > 
> > ... Not understand a problem.
> 
> Ah, I understand now ;)
> 
> The problem here is that include/config.h previously existed as a link.
> Your patch does a 'echo > include/config.h'. When this is a link then it
> will empty the file the link points to instead of creating an empty
> include/config.h.
> 
> So, to run into it you have to:
> 
> # git checkout master
> # make pcm038_defconfig && make
> # git checkout for-next/for-next/remove-config-h
> # make
> # git checkout master
> 
> The solution to this seems to be to remove include/config.h before
> echoing into it.
> 
> Sascha
> 
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