linux-kernel - Re: [PATCH] checkpatch: remove GCC_BINARY

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Date:   Mon, 27 Aug 2018 00:22:25 -0700
From:   Joe Perches <joe@...ches.com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Andy Whitcroft <apw@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: remove GCC_BINARY_CONSTANT warning

On Mon, 2018-08-27 at 06:59 +0000, Christophe Leroy wrote:
> This warning was there to avoid the use of 0bxxx values
> as they are not supported by gcc prior to v4.3
> 
> Since commit cafa0010cd51f ("Raise the minimum required gcc
> version to 4.6"), it's not an issue anymore and using
> such values can increase readability of code.

Seems sensible as the other compilers also support binary literals
from relatively old versions.
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf
https://software.intel.com/en-us/articles/c14-features-supported-by-intel-c-compiler

> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  scripts/checkpatch.pl | 11 -----------
>  1 file changed, 11 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 5219280bf7ff..d98650790722 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -4933,17 +4933,6 @@ sub process {
>  		while ($line =~ m{($Constant|$Lval)}g) {
>  			my $var = $1;
>  
> -#gcc binary extension
> -			if ($var =~ /^$Binary$/) {
> -				if (WARN("GCC_BINARY_CONSTANT",
> -					 "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
> -				    $fix) {
> -					my $hexval = sprintf("0x%x", oct($var));
> -					$fixed[$fixlinenr] =~
> -					    s/\b$var\b/$hexval/;
> -				}
> -			}
> -
>  #CamelCase
>  			if ($var !~ /^$Constant$/ &&
>  			    $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&