From: Bruce Richardson <bruce.richardson@intel.com>
To: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] net/mlx: fix compile errors with ignore pedantic pragma
Date: Tue, 20 Sep 2016 16:58:48 +0100 [thread overview]
Message-ID: <20160920155848.GA74952@bricha3-MOBL3> (raw)
In-Reply-To: <20160920125126.GG17252@6wind.com>
On Tue, Sep 20, 2016 at 02:51:27PM +0200, Adrien Mazarguil wrote:
> On Mon, Sep 19, 2016 at 04:26:05PM +0100, Bruce Richardson wrote:
> > On Mon, Sep 19, 2016 at 04:59:59PM +0200, Adrien Mazarguil wrote:
> > > Hi Bruce,
> > >
> > > On Mon, Sep 19, 2016 at 03:36:54PM +0100, Bruce Richardson wrote:
> > > > With recent gcc versions, e.g. gcc 6.1, compilation of mlx drivers with
> > > > debug enabled produces lots of errors complaining that "pedantic" is
> > > > not a warning level that can be ignored.
> > > >
> > > > error: ‘-pedantic’ is not an option that controls warnings [-Werror=pragmas]
> > > > #pragma GCC diagnostic ignored "-pedantic"
> > > > ^~~~~~~~~~~
> > > >
> > > > These errors can be removed by changing the "-pedantic" to "-Wpedantic".
> > >
> > > Nice to have a workaround, I thought they did not keep the option at all.
> > > However after testing:
> > >
> > > - It does not seem to work with GCC 4.6 and older, they prefer -pedantic:
> > > "warning: unknown option after `#pragma GCC diagnostic' kind".
> > >
> > > - GCC 4.9 (possibly 5.x as well) does not care, can use either -pedantic or
> > > -Wpedantic.
> > >
> > > - GCC 6 can only supports -Wpedantic.
> > >
> > > Note we're working toward removing the need for these #pragma in the first
> > > place as soon as possible, however in the meantime I fear that checking the
> > > GCC version is necessary.
> > >
> > Depends on how old of GCC version we need to support. From the release notes
> > it appears that -Wpedantic was introduced in GCC 4.8 (3 1/2 years ago).
> >
> > https://gcc.gnu.org/gcc-4.8/changes.html
> >
> > Do we need to support compilation on gcc versions older than this?
>
> I'm all for upgrading so I do not really mind if we stop caring about older
> GCC versions (especially considering this problem only occurs in debugging
> mode which is seldom used by non-developers). The version check is necessary
> if we want to keep full compatibility with at least:
>
> - RHEL <= 6.x
> - Debian <= 7.x
> - Ubuntu <= 13.04
>
> Works for me either way, thus:
>
> Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
>
Any objections to dropping of support for debug settings for these OS's?
/Bruce
next prev parent reply other threads:[~2016-09-20 15:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-19 14:36 Bruce Richardson
2016-09-19 14:59 ` Adrien Mazarguil
2016-09-19 15:26 ` Bruce Richardson
2016-09-20 12:51 ` Adrien Mazarguil
2016-09-20 15:58 ` Bruce Richardson [this message]
2016-09-20 18:17 ` Adrien Mazarguil
2016-09-30 14:33 ` Ferruh Yigit
2016-09-21 5:11 ` Panu Matilainen
2016-09-21 9:48 ` Bruce Richardson
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