linux-kernel - Re: [PATCH 3/3] kbuild: Allow passing additional HOSTCFLAGS and HOSTLDFLAGS

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Message-ID: <CAK7LNAT8gsvd-DP_TAFNSbJ_Bn=H-gjfuirWd9kmxh8Yx60cfA@mail.gmail.com>
Date:   Thu, 5 Apr 2018 13:59:58 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 3/3] kbuild: Allow passing additional HOSTCFLAGS and HOSTLDFLAGS

2018-03-29 9:48 GMT+09:00 Laura Abbott <labbott@...hat.com>:
>
> Similar to AFLAGS_KBUILD, there may be uses (e.g. hardening) for passing in
> additional flags to host programs. Allow these to be passed in from the
> environment.
>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
>  Documentation/kbuild/kbuild.txt | 9 +++++++++
>  Makefile                        | 3 +++
>  2 files changed, 12 insertions(+)
>
> diff --git a/Documentation/kbuild/kbuild.txt b/Documentation/kbuild/kbuild.txt
> index ac2363ea05c5..3751a4bc8596 100644
> --- a/Documentation/kbuild/kbuild.txt
> +++ b/Documentation/kbuild/kbuild.txt
> @@ -24,6 +24,15 @@ KAFLAGS
>  --------------------------------------------------
>  Additional options to the assembler (for built-in and modules).
>
> +AFLAGS_HOSTCFLAGS
> +--------------------------------------------------
> +Additional options passed to the compiler when building host programs.
> +
> +AFLAGS_HOSTLDFLAGS
> +--------------------------------------------------
> +Additional options passed to the linker (through the compiler) when buidling
> +host programs.
> +


I am afraid you misunderstood the meaning of 'AFLAGS'.

AFLAGS is not 'Additional flags', but 'Assembler flags'
that are used for compiling *.S files.

AFLAGS for host programs is weird.



I see similar proposals from different people.

I replied like follows:
https://lkml.org/lkml/2018/2/28/178

However, Robin seems busy lately.

I will wait a bit, then
if nobody does this, I may do it.




>  AFLAGS_MODULE
>  --------------------------------------------------
>  Additional module specific options to use for $(AS).
> diff --git a/Makefile b/Makefile
> index 7ba478ab8c82..2cab3f8d489c 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -367,6 +367,9 @@ HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
>  HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
>  HOST_LOADLIBES := $(HOST_LFS_LIBS)
>
> +HOSTCFLAGS  += $(AFLAGS_HOSTCFLAGS)
> +HOSTLDFLAGS  += $(AFLAGS_HOSTLDFLAGS)
> +
>  # Make variables (CC, etc...)
>  AS             = $(CROSS_COMPILE)as
>  LD             = $(CROSS_COMPILE)ld
> --
> 2.16.2
>
> --
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-- 
Best Regards
Masahiro Yamada