Re: [Linux-kernel-mentees] [RFC PATCH v2] checkpatch: add shebang check to EXECUTE_PERMISSIONS

[Lukas Bulwahn <lukas.bulwahn@gmail.com>]

On Tue, 13 Oct 2020, Joe Perches wrote:

> On Wed, 2020-10-14 at 08:47 +0200, Lukas Bulwahn wrote:
> > 
> > On Tue, 13 Oct 2020, Joe Perches wrote:
> > 
> > > On Wed, 2020-10-14 at 08:36 +0200, Lukas Bulwahn wrote:
> > > > On Tue, 13 Oct 2020, Joe Perches wrote:
> > > > 
> > > > > On Wed, 2020-10-14 at 08:21 +0200, Lukas Bulwahn wrote:
> > > > > > What does checkpatch.pl warn about and what does clang-format still warn 
> > > > > > about, which is generally accepted okay as style in the kernel?
> > > > > 
> > > > > clang-format doesn't warn at all, it just reformats.
> > > > > 
> > > > You can run clang-format with --dry-run and then it would just state the 
> > > > proposed changes, right?
> > > 
> > > clang-format through at least version 10 does not have
> > > a --dry-run option.
> > > 
> > > 
> > 
> > Just a quick check:
> > 
> > version 9 does not have the --dry-run option:
> > 
> > https://releases.llvm.org/9.0.0/tools/clang/docs/ClangFormat.html
> > 
> > version 10 does:
> > 
> > https://releases.llvm.org/10.0.0/tools/clang/docs/ClangFormat.html
> 
> Perhaps some version 10 variants do, but 10.0.0 does not.
> 
> $ which clang-format
> /usr/local/bin/clang-format
> $ clang-format --version
> clang-format version 10.0.0 (git://github.com/llvm/llvm-project.git 305b961f64b75e73110e309341535f6d5a48ed72)
> $ clang-format --dry-run
> clang-format: Unknown command line argument '--dry-run'.  Try: 'clang-format --help'
> clang-format: Did you mean '  --debug'?
>

Hmm... either the documentation is wrong; or the clang-format version 
10.0.0 you are was an early version 10 during development before the 
release and did not have that feature yet? 

$ clang-format-10 --version
Ubuntu clang-format version 
10.0.1-++20200928083909+ef32c611aa2-1~exp1~20200928185400.194

$ clang-format-10 --help | grep 'dry-run'
  --dry-run                  - If set, do not actually make the formatting 
changes
  --ferror-limit=<uint>      - Set the maximum number of clang-format
    errors to emit before stopping (0 = no limit). Used only with --dry-run or -n
  -n                         - Alias for --dry-run


You have probably seen that clang/llvm-11 was released; I guess a good 
motivation for us to update our clang setup? :)

Lukas
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