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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Wei Chen <wei.chen@linaro.org>
Cc: sstabellini@kernel.org, wei.liu2@citrix.com,
	steve.capper@arm.com, andrew.cooper3@citrix.com,
	ian.jackson@eu.citrix.com, xen-devel@lists.xen.org,
	julien.grall@arm.com
Subject: Re: [RFC v2] xen/arm: build: add missed dependency for head.S
Date: Tue, 7 Jun 2016 09:18:27 -0400	[thread overview]
Message-ID: <20160607131826.GA8000@x230.dumpdata.com> (raw)
In-Reply-To: <20160607043443.3111-1-Wei.Chen@linaro.org>

On Tue, Jun 07, 2016 at 12:34:43PM +0800, Wei Chen wrote:
> In current Xen build rules, the build system will only check the
> dependencies in current folder and obj-y generated dependencies
> in other folder.
> 
> But Makefile may add some objects to ALL_OBJS. These objects may
> be not in the same folder as Makefile. Use arch/arm/Makefile as
> an example:
>     ALL_OBJS := $(TARGET_SUBARCH)/head.o
> 
> The head.o is not in the same folder as Makefile and is not listed
> in obj-y. So, when we update the header files that had been included
> in head.S. The build system would not check the dependency of head.S.
> The head.S would not be re-compiled.
> 
> In this patch, we will get objects added by Makefile and add their
> dependencies to check list.
> 
> Signed-off-by: Wei Chen <Wei.Chen@linaro.org>
> ---
> v1 -> v2:
> - Use a generic method instead of changing Makefiles
> ---
>  xen/Rules.mk | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/Rules.mk b/xen/Rules.mk
> index 961d533..fb3087c 100644
> --- a/xen/Rules.mk
> +++ b/xen/Rules.mk
> @@ -95,12 +95,21 @@ include $(BASEDIR)/arch/$(TARGET_ARCH)/Rules.mk
>  include Makefile
>  
>  DEPS = .*.d
> +
> +# In obj-y and ALL_OBJS, there may have some objects are not in the

You are missing a verb here.

I think you mean to say 'there may be some objects which are not in the'
> +# same folder as Makefile, so we have to use gendep to generate
> +# dependencies for them.
> +DEP_OBJS = $(obj-y)
> +
> +# Extract objects from ALL_OBJS added by Makefile.
> +DEP_OBJS += $(filter-out %built_in.o,$(ALL_OBJS))
> +
>  define gendep
>      ifneq ($(1),$(subst /,:,$(1)))
>          DEPS += $(dir $(1)).$(notdir $(1)).d
>      endif
>  endef
> -$(foreach o,$(filter-out %/,$(obj-y)),$(eval $(call gendep,$(o))))
> +$(foreach o,$(filter-out %/,$(DEP_OBJS)),$(eval $(call gendep,$(o))))
>  
>  # Ensure each subdirectory has exactly one trailing slash.
>  subdir-n := $(patsubst %,%/,$(patsubst %/,%,$(subdir-n) $(subdir-)))
> -- 
> 2.7.4
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

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  reply	other threads:[~2016-06-07 13:18 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-03 10:07 [RFC] " Wei Chen
2016-06-06 17:08 ` Julien Grall
2016-06-07 10:03   ` Ian Jackson
2016-06-07  4:34     ` [RFC v2] " Wei Chen
2016-06-07 13:18       ` Konrad Rzeszutek Wilk [this message]
2016-06-08  3:10         ` Wei Chen
2016-06-07 16:01       ` [RFC v2] xen/arm: build: add missed dependency for head.S [and 1 more messages] Ian Jackson
2016-06-07 16:24         ` Wei Liu
2016-06-08  3:14           ` Wei Chen
2016-06-08  8:09             ` Wei Liu
2016-06-07 10:07     ` [RFC] xen/arm: build: add missed dependency for head.S Julien Grall

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