[llvm-dev] [cfe-dev] Modernizing LLVM Coding Style Guide and enforcing Clang-tidy

Mehdi Amini via llvm-dev llvm-dev at lists.llvm.org
Tue Jan 10 00:37:28 PST 2017

> On Jan 10, 2017, at 12:33 AM, Sean Silva <chisophugis at gmail.com> wrote:
> On Mon, Jan 9, 2017 at 12:48 PM, Mehdi Amini via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> > On Jan 9, 2017, at 12:47 PM, Renato Golin <renato.golin at linaro.org <mailto:renato.golin at linaro.org>> wrote:
> >
> > On 9 January 2017 at 19:04, Mehdi Amini <mehdi.amini at apple.com <mailto:mehdi.amini at apple.com>> wrote:
> >> This is not correct according to the number of “should” and the imperative tone for many aspects of http://llvm.org/docs/CodingStandards.html#source-code-formatting <http://llvm.org/docs/CodingStandards.html#source-code-formatting>
> >
> > You mistake the tone of the documentation.
> Either one of us is mistaken, but I find yourself being fairly confident here…
> Try going above the 80 cols and defend it as your personal preference in a review, and let me know how it went.
> I doubt most reviewers will notice if you go slightly over 80 cols without some sort of automated check warning about it. W.r.t. the higher-level semantic guidelines, no reviewer keeps them all in their head. Just writing down a rule doesn't buy anything no matter how you write it down.

Well I believe it still buys you an interesting property: no bike shedding over “personal preference” in any review. There’s a guideline to point at and we can’t instead focus on the important bits.


> The real coding standard is the one that a critical mass of LLVM developers will comment on when they find something objectionable.
> <download (8).png>
>> -- Sean Silva
>> Mehdi
> > There are things that
> > cannot be (exceptions, RTTI), things that are important to get right
> > (includes vs. forward declaration), things that are preferred
> > (c++11-isms) and things that are optional and very much depends on the
> > situation. The four items in the list I replied to fall into the
> > latter category.
> >
> > The tone used for each type is appropriate to its enforcement. If you
> > add compiler errors or warnings, it's pretty easy to enforce.
> > Everything else will have varying degrees of success, and being
> > obnoxious about it has never been, and I hope never will be, our way.
> >
> > We don't force people to run clang-format on patches, we ask when it's
> > ugly and people do because they believe it's a good thing. When the
> > formatting doesn't hurt my eyes, I don't ask for clang-format. I
> > certainly won't start asking people to run clang-tidy, though I'd be
> > happy if they did. That's personal and with the volume of commits we
> > have, that last thing we need is people blocking or reverting patches
> > because they didn't conform to personal preferences, even if they were
> > encoded in the coding standards.
> >
> > I also strongly oppose to encoding personal preferences with a
> > stronger wording that it's warranted. Personal is personal. If it's
> > legal C++ and it's an appropriate use of the language for the case at
> > hand, than it's fine. I couldn't care less if you use "using" or
> > "typedef". I can understand both. "Prefer using" is an interesting
> > proposition, but refuse patches because they have "typedefs" is silly.
> >
> > Honestly, my "coding standards" would be as simple as "do whatever
> > Scott Meyers says you should", but the LLVM one is nice, too. Unless
> > it's used as a weapon.
> >
> > cheers,
> > --renato
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