Re: [tree] ftrace, v16

[Ingo Molnar <mingo@elte.hu>]

* Sam Ravnborg <sam@ravnborg.org> wrote:

> Hi Ingo
> 
> >       kbuild: create new CFLAGS_REMOVE_(basename).o option
> 
> But no changes to Documentation/kbuild/makefiles.txt
> 
> Documentation must be included for new kbuild features.
> 
> 
> > +ifdef CONFIG_DYNAMIC_FTRACE
> > +CFLAGS_REMOVE_ftrace.o = -pg
> > +endif
> 
> I can see where this comes from as we have:
> 
>     CFLAGS_ftrace.o := -foobar
> 
> But in all cases below I see the pattern:
> 
> ifdef CONFIG_FOO_BAR
> CFLAGS_REMOVE_foobar.o = -pg
> endif
> 
> And it would be nice to get this on one line instead.
> And use a syntax we can somehow remember.
> 
> Today we have:
>     ccflags-y := -foobar
> 
> to add options valid for the whole file.
> So we should then add:
> - possibility to remove an option valid for the whole file
> - add/remove an option for a single file
> 
> The suggested syntax:
> ccflags-remove-y := -foobar
> ccflags-<file.o>-y := -foobar
> ccflags-remove-<file.o>-y := -foobar
> 
> So in the case above for ftrace we would use:
> 
> ccflags-remove-ftrace.o-$(CONFIG_DYNAMIC_FTRACE) := -pg
> 
> Comments?

sounds like a good cleanup to me. Would you be interested in sending 
patches for this?

	Ingo