linux-kernel - Re: [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo)

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Message-ID: <20210120095541.f354ml4h36rfc4gx@vireshk-i7>
Date:   Wed, 20 Jan 2021 15:25:41 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Bill Mills <bill.mills@...aro.org>,
        Anmar Oueja <anmar.oueja@...aro.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo)

On 20-01-21, 17:58, Masahiro Yamada wrote:
> > +%.dtb %.dtbo: include/config/kernel.release scripts_dtc
> >         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
> 
> 
> No, this is wrong because it does not work
> as grouped targets.
> 
> You need to separate them.
> 
> 
> 
> %.dtb: include/config/kernel.release scripts_dtc
>          $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
> 
> %.dtbo: include/config/kernel.release scripts_dtc
>          $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
> 
> 
> 
> 
> See GNU make manual.
> 
> 
> "Pattern rules may have more than one target; however, every target
> must contain a % character.
> Pattern rules are always treated as grouped targets"
> 
> https://www.gnu.org/software/make/manual/html_node/Pattern-Intro.html

Hmm, okay I will do that.

I did it this way because I saw similar stuff at some other places. I
am not a regular Makefile hacker, there is every chance I am reading
it wrong.

$ git grep "%.*%.*:" | grep Makefile
Makefile:%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
scripts/Makefile.build:$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
scripts/Makefile.host:$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
scripts/genksyms/Makefile:$(obj)/pars%.tab.c $(obj)/pars%.tab.h: $(src)/pars%.y FORCE
tools/perf/Documentation/Makefile:$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : %.txt
tools/perf/Documentation/Makefile:$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.xml

-- 
viresh