linux-kernel - Re: [RFC PATCH v2 09/31] kvx: Add build infrastructure

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Message-Id: <9965e2d1-bae8-4ce7-911c-783c772e9ff1@app.fastmail.com>
Date:   Fri, 20 Jan 2023 16:01:11 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Jules Maselbas" <jmaselbas@...ray.eu>
Cc:     "Yann Sionneau" <ysionneau@...ray.eu>,
        "Jonathan Corbet" <corbet@....net>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Marc Zyngier" <maz@...nel.org>,
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Subject: Re: [RFC PATCH v2 09/31] kvx: Add build infrastructure

On Fri, Jan 20, 2023, at 15:53, Jules Maselbas wrote:
> On Fri, Jan 20, 2023 at 03:39:22PM +0100, Arnd Bergmann wrote:
>> On Fri, Jan 20, 2023, at 15:09, Yann Sionneau wrote:
>> >      - Fix clean target raising an error from gcc (LIBGCC)
>> 
>> I had not noticed this on v1 but:
>> 
>> > +# Link with libgcc to get __div* builtins.
>> > +LIBGCC	:= $(shell $(CC) $(DEFAULT_OPTS) --print-libgcc-file-name)
>> 
>> It's better to copy the bits of libgcc that you actually need
>> than to include the whole thing. The kernel is in a weird
> It was initialy using KCONFIG_CFLAGS which do not contains valid options
> when invoking the clean target.
>
> I am not exactly sure what's needed by gcc for --print-libgcc-file-name,
> my guess is that only the -march option matters, I will double check
> internally with compiler peoples.
>
>> state that is neither freestanding nor the normal libc based
>> environment, so we generally want full control over what is
>> used. This is particularly important for 32-bit architectures
>> that do not want the 64-bit division, but there are probably
>> enough other cases as well.

To clarify: I meant you should not include libgcc.a at all but
add the minimum set of required files as arch/kvx/lib/*.S.

     Arnd