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From: Fabio Estevam <festevam@gmail.com>
Date: Wed, 7 Mar 2018 06:47:14 -0300
Message-ID: <CAOMZO5C5jSxwKMV0hZpA1emFW9ha8GN4XsTsdTfgPU4eJ44Ctw@mail.gmail.com>
Subject: Re: [PATCH] media: dvbdev: fix building on ia64
To: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>,
        Mauro Carvalho Chehab <mchehab@infradead.org>
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Hi Mauro,

On Wed, Mar 7, 2018 at 6:14 AM, Mauro Carvalho Chehab
<mchehab@s-opensource.com> wrote:
> Not sure why, but, on ia64, with Linaro's gcc 7.3 compiler,
> using #ifdef (CONFIG_I2C) is not OK.

Looking at the kbuild report the failure happens when CONFIG_I2C=m.

IS_ENABLED() macro takes care of both built-in and module as it will expand to:

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

and that's the reason why IS_ENABLE() fixes the build problem.

Regards,

Fabio Estevam