linux-kernel - Re: [PATCH v2 3/5] kbuild: Use relative path for $(objtree)

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Date:	Tue, 10 Jun 2014 10:17:42 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Richard Weinberger <richard.weinberger@...il.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v2 3/5] kbuild: Use relative path for $(objtree)

On 2014-06-10 09:40, Geert Uytterhoeven wrote:
> Hi Michael,
> 
> On Thu, Jun 5, 2014 at 5:56 PM, Michal Marek <mmarek@...e.cz> wrote:
>> --- a/arch/um/Makefile
>> +++ b/arch/um/Makefile
>> @@ -111,8 +111,7 @@ endef
>>  KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
>>
>>  archheaders:
>> -       $(Q)$(MAKE) -C '$(srctree)' KBUILD_SRC= \
>> -               ARCH=$(HEADER_ARCH) O='$(objtree)' archheaders
>> +       $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
> 
> Should the logic in https://lkml.org/lkml/2014/6/1/17 be changed as well?

I haven't tried it, but I don't see a problem with the added make
invocations:

+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
+		    SRCARCH=$(HEADER_ARCH) src=asm \
+		    obj=arch/$(HEADER_ARCH)/include/generated/asm
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
+		    SRCARCH=$(HEADER_ARCH) src=uapi/asm \
+		    obj=arch/$(HEADER_ARCH)/include/generated/uapi/asm

The problem with the first make was the directory change (-C ...), which
broke the relative paths. These two just spawn another make in the
current directory, so it should be fine.

Michal
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