linux-kernel - Re: [PATCH] kbuild: support make dir/file.i for *.S

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Date:	Sat, 12 Dec 2015 14:13:03 -0500
From:	Brian Gerst <brgerst@...il.com>
To:	Wang YanQing <udknight@...il.com>, mmarek@...e.com,
	linux-kbuild@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: support make dir/file.i for *.S

On Thu, Dec 10, 2015 at 11:33 AM, Wang YanQing <udknight@...il.com> wrote:
> This feature could reduce a little time to expand all
> the macros in *.S for reading.
>
> Signed-off-by: Wang YanQing <udknight@...il.com>
> ---
>  Makefile               | 2 ++
>  scripts/Makefile.build | 6 ++++++
>  2 files changed, 8 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index 7558c9c..d7e2060 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1552,6 +1552,8 @@ endif
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.s: %.S prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> +%.i: %.S prepare scripts FORCE
> +       $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.o: %.S prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.symtypes: %.c prepare scripts FORCE
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 2c47f9c..2a51d49 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -287,6 +287,12 @@ cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
>  $(obj)/%.s: $(src)/%.S FORCE
>         $(call if_changed_dep,as_s_S)
>
> +quiet_cmd_cc_i_S = CPP $(quiet_modtag) $@
> +cmd_cc_i_S       = $(CPP) $(a_flags)   -o $@ $<
> +
> +$(obj)/%.i: $(src)/%.S FORCE
> +       $(call if_changed_dep,cc_i_S)
> +
>  quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
>  cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<

*.s (lower case) is the suffix used for preprocessed assembly files,
and there is already a rule for that.  *.i is for preprocessed C
files.

--
Brian Gerst
--
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