[PATCH v4] devtools: add .clang-format file

[Morten Brørup]

> From: Stephen Hemminger [mailto:stephen at networkplumber.org]
> Sent: Monday, 13 May 2024 17.55
> 
> On Mon, 13 May 2024 14:08:07 +0100
> Ferruh Yigit <ferruh.yigit at amd.com> wrote:
> 
> > 2. Double tab indentation vs parenthesis align
> >          if (iter->bus != NULL &&
> >  -                       /* not in middle of rte_eth_dev iteration, */
> >  -                       iter->class_device == NULL) {
> >  +           /* not in middle of rte_eth_dev iteration, */
> >  +           iter->class_device == NULL) {
> >
> > DPDK coding guide suggests double tab, but also accepts alignment by
> > spaces. But as far as I can see most of code has double tab.
> > Majority of the diff caused because of this rule.
> 
> 
> I personally am more used the aligned style, and most tools support
> that.
> The DPDK one is unique (not done by most other projects). So can we just
> keep the kernel (what is this clang-format) version.

I personally prefer the double tab.
It also works with editors showing tab as 4 space indentation.

Mixing tabs and spaces only works if the editor shows tabs as 8 space indentation.

Double tab works with both editor configurations.

And there is no confusion if the following block happens to be aligned with the following parameters. E.g.:

if fool(x,
        y)
        myfn();

vs.

if fool(x,
                y)
        myfn();