linux-kernel - Re: [PATCH] kbuild: use -E instead of -c for _

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Message-ID: <CAK7LNAQ8M_z-z8tp-OiU=n13iggqEyY084S5HNS3p8LwM3qc1g@mail.gmail.com>
Date:   Sat, 6 Jul 2019 23:37:44 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: use -E instead of -c for __cc-option

On Fri, Jun 28, 2019 at 2:13 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> Use -E instead of -c like scripts/Kconfig.include
> This makes the compiler flag evaluation slightly faster.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---

Applied to linux-kbuild.



>  scripts/Kbuild.include | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> index f641bb0aa63f..e4329b92d165 100644
> --- a/scripts/Kbuild.include
> +++ b/scripts/Kbuild.include
> @@ -113,7 +113,7 @@ as-instr = $(call try-run,\
>  # __cc-option
>  # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
>  __cc-option = $(call try-run,\
> -       $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
> +       $(1) -Werror $(2) $(3) -E -x c /dev/null -o "$$TMP",$(3),$(4))
>
>  # Do not attempt to build with gcc plugins during cc-option tests.
>  # (And this uses delayed resolution so the flags will be up to date.)
> --
> 2.17.1
>


-- 
Best Regards
Masahiro Yamada