linux-kernel - Re: [PATCH] lib: vsprintf: add printf format conversion %M for errno strings

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Message-ID: <1498411624.24295.36.camel@perches.com>
Date:   Sun, 25 Jun 2017 10:27:04 -0700
From:   Joe Perches <joe@...ches.com>
To:     "Enrico Weigelt, metux IT consult" <enrico.weigelt@...3.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: vsprintf: add printf format conversion %M for
 errno strings

On Sun, 2017-06-25 at 19:12 +0200, Enrico Weigelt, metux IT consult
wrote:
> Adding a new format conversion for *printf() and friends.

Every use of %M is going to cause gcc when using __printf to emit
a warning like:

unknown conversion type character ‘M’ in format [-Wformat=]

Beyond that, why is this useful?
There can't possibly be any fast-path use.
Why not just create a function that does errno/string conversions?