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SubjectRe: [PATCH 1/2] #2 (Generation of *.s files from *.S files in kbuild)
On Fri, Aug 13, 2004 at 08:33:47PM +0200, Sam Ravnborg wrote:
> On Fri, Aug 13, 2004 at 12:24:26PM +0300, Dan Aloni wrote:
> > diff -urN linux-2.6.7/scripts/Makefile.build linux-2.6.7-work/scripts/Makefile.build
> > --- linux-2.6.7/scripts/Makefile.build 2004-08-13 12:18:52.000000000 +0300
> > +++ linux-2.6.7-work/scripts/Makefile.build 2004-08-13 12:19:00.000000000 +0300
> > @@ -194,11 +194,11 @@
> > $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
> > $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
> >
> > -quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
> > -cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
> > +quiet_cmd_as_lds_lds_S = CPP $(quiet_modtag) $@
> > +cmd_as_lds_lds_S = $(CPP) $(a_flags) -o $@ $<
> >
> > -%.s: %.S FORCE
> > - $(call if_changed_dep,as_s_S)
> > +%.lds: %.lds.S FORCE
> > + $(call if_changed_dep,as_lds_lds_S)
>
>
> This is not good.
> The .S -> .s is used for assembly.

Actually the only rule I saw that is being used for
assembly is the .S -> .o rule (examples under
arch/i386/kernel).

> An additional rule is needed:
>
> Something like:
> quiet_cmd_cpp_lds_S = LDS $@
> cmd_cpp_lds_S = $(CPP) $(cpp_flags) -o $@ $<
>
> %.lds: %.lds.S FORCE
> $(call if_changed_dep,cpp_lds_S)
>
> Adding a new rule it no longer are acceptable to misuse
> AFLAGS for this. So you have to add support for a new
> set of flags.
> Better name them with CPP so they can be used for other
> preprocessings tasks later if needed.
>
> So in Makefile.lib you need to add cpp_flags like a_flags
> but using CPPFLAGS, EXTRA_CPPFLAGS, and CPPFLAGS_@
>
> Try building a clean kernel after implementing this.

Okay, I'll send a patch when it's ready.

--
Dan Aloni
da-x@colinux.org
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