linux-kernel - Re: [PATCH] objtool/x86: Replace Non-standard Range Expression in Case

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Date:   Fri, 16 Feb 2018 17:47:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Progyan Bhattacharya <bprogyan@...il.com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Nick Desaulniers <nick.desaulniers@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Nicholas Mc Guire <der.herr@...r.at>
Subject: Re: [PATCH] objtool/x86: Replace Non-standard Range Expression in
 Case

On Fri, Feb 16, 2018 at 08:35:11AM -0600, Josh Poimboeuf wrote:
> On Fri, Feb 16, 2018 at 07:55:13PM +0530, Progyan Bhattacharya wrote:
> > Replace range expressions with seperate individual cases, i.e. convert case 1...3: to case 1: case 2: case 3
> > Range expression within case statements are non-standard C code and can create issues over compiler and platform variety.
> > 
> > While compiling with gcc 4.8 (RHEL) I encountered this error on range expression in case statements:
> > error: range expressions in switch statements are non-standard [-Werror=pedantic]
> > 
> > Signed-off-by: Progyan Bhattacharya <progyanb@....org>
> 
> Hi Progyan,
> 
> Thank you for the patch.
> 
> I think this makes the code unnecessarily verbose and less readable.  We
> rely on many such GCC extensions, and we don't aim to comply with
> standard C.  And AFAIK, we don't use -Werror=pedantic in the kernel.

Agreed, it makes the code actively worse. Just don't use error=pedantic.