linux-kernel - Re: [PATCH v4 07/31] kconfig: add built-in function support

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Date:   Tue, 22 May 2018 06:58:33 +0200
From:   Ulf Magnusson <ulfalizer@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH v4 07/31] kconfig: add built-in function support

On Tue, May 22, 2018 at 6:50 AM, Ulf Magnusson <ulfalizer@...il.com> wrote:
> On Tue, May 22, 2018 at 5:11 AM, Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
>> 2018-05-22 0:10 GMT+09:00 Ulf Magnusson <ulfalizer@...il.com>:
>>> On Mon, May 21, 2018 at 4:32 PM, Ulf Magnusson <ulfalizer@...il.com> wrote:
>>>> On Mon, May 21, 2018 at 4:23 PM, Ulf Magnusson <ulfalizer@...il.com> wrote:
>>>>> On Sun, May 20, 2018 at 4:50 PM, Sam Ravnborg <sam@...nborg.org> wrote:
>>>>>> Will the following be equal:
>>>>>>
>>>>>>         $(foo,abc,$(x),$(y))
>>>>>>         $(foo, abc, $(x), $(y))
>>>>>>
>>>>>> make is rather annoying as space is significant, but there seems no good reason
>>>>>> for kconfig to inheritate this.
>>>>>> So unless there are good arguments consider alloing the spaces.
>>>>>> If the current implmentation already supports optional spaces then I just missed
>>>>>> it whie reviewing.
>>>>>>
>>>>>>         Sam
>>>>>
>>>>> +1 from me.
>>>>>
>>>>> I also find the rules for whitespace in Make confusing, and always
>>>>> have to look them up when doing trickier stuff. Maybe they're the
>>>>> result of people not considering whitespace initially, and stuff
>>>>> getting tacked on later. GNU Make adds some alternate syntaxes with
>>>>> quotes.
>>>>>
>>>>> I was going to mention shell, but it looks like you already did. :)
>>>>>
>>>>> If we go with Make-like syntax, maybe we could at least have a variant
>>>>> with fewer whitespace gotchas.
>>>>>
>>>>> Cheers,
>>>>> Ulf
>>>>
>>>> Maybe it'd be a pain to implement, but something like $(foo $(x) "two
>>>> words" "interpolated $(stuff)") seems pretty nice, with three
>>>> arguments there.
>>>
>>> Guess that might interact poorly with $(shell foo "bar baz") though.
>>> Kinda nice to have a syntax that doesn't overlap with shell when
>>> building shell commands.
>>
>>
>> Right.  I can easily imagine
>> that would end up with more gotchas due to quoting and escaping.
>
> Yeah, you're right. It's probably trying to fix something that isn't
> broken. Make's syntax really isn't bad there, just slightly
> non-obvious at first...
>
> Think it's fine now. Better to commit to the syntax than trying to be
> "helpful" by adding a bunch of random exceptions too. That probably
> gives a bigger mess in the end...
>
> Cheers,
> Ulf

I'm fine with the comma-after-function-name change though. That just
makes it more consistent.

Cheers,
Ulf