From: Scott Wood <scottwood@freescale.com>
To: Mitch Bradley <wmb@firmworks.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>,
Michal Marek <mmarek@suse.cz>,
Stephen Warren <swarren@nvidia.com>,
<devicetree-discuss@lists.ozlabs.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: dtc: import latest upstream dtc
Date: Tue, 9 Oct 2012 19:04:26 -0500 [thread overview]
Message-ID: <1349827466.26044.16@snotra> (raw)
In-Reply-To: <5074B155.4090703@firmworks.com> (from wmb@firmworks.com on Tue Oct 9 18:20:53 2012)
On 10/09/2012 06:20:53 PM, Mitch Bradley wrote:
> On 10/9/2012 11:16 AM, Stephen Warren wrote:
> > On 10/01/2012 12:39 PM, Jon Loeliger wrote:
> >>>
> >>> What more do you think needs discussion re: dtc+cpp?
> >>
> >> How not to abuse the ever-loving shit out of it? :-)
> >
> > Perhaps we can just handle this through the regular patch review
> > process; I think it may be difficult to define and agree upon
> exactly
> > what "abuse" means ahead of time, but it's probably going to be easy
> > enough to recognize it when one sees it?
>
>
> One of the ways it could get out of hand would be via "include
> dependency hell". People will be tempted to reuse existing .h files
> containing pin definitions, which, if history is a guide, will end up
> depending on all sorts of other .h files.
>
> Another problem I often face with symbolic names is the difficulty of
> figuring out what the numerical values really are (for debugging),
> especially when .h files are in different subtrees from the files that
> use the definitions, and when they use multiple macro levels and fancy
> features like concatenation. Sometimes I think it's clearer just to
> write the number and use a comment to say what it is.
Both comments apply just as well to ordinary C code, and I don't think
anyone would seriously suggest just using comments instead for C code.
Is there a way to ask CPP to evaluate a macro in the context of the
input file, rather than produce normal output? If not, I guess you
could make a tool that creates a wrapper file that includes the main
file and then evaluates the symbol you want.
-Scott
WARNING: multiple messages have this Message-ID (diff)
From: Scott Wood <scottwood@freescale.com>
To: Mitch Bradley <wmb@firmworks.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>,
Michal Marek <mmarek@suse.cz>,
Stephen Warren <swarren@nvidia.com>,
devicetree-discuss@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Subject: Re: dtc: import latest upstream dtc
Date: Tue, 9 Oct 2012 19:04:26 -0500 [thread overview]
Message-ID: <1349827466.26044.16@snotra> (raw)
In-Reply-To: <5074B155.4090703@firmworks.com> (from wmb@firmworks.com on Tue Oct 9 18:20:53 2012)
On 10/09/2012 06:20:53 PM, Mitch Bradley wrote:
> On 10/9/2012 11:16 AM, Stephen Warren wrote:
> > On 10/01/2012 12:39 PM, Jon Loeliger wrote:
> >>>
> >>> What more do you think needs discussion re: dtc+cpp?
> >>
> >> How not to abuse the ever-loving shit out of it? :-)
> >
> > Perhaps we can just handle this through the regular patch review
> > process; I think it may be difficult to define and agree upon
> exactly
> > what "abuse" means ahead of time, but it's probably going to be easy
> > enough to recognize it when one sees it?
>
>
> One of the ways it could get out of hand would be via "include
> dependency hell". People will be tempted to reuse existing .h files
> containing pin definitions, which, if history is a guide, will end up
> depending on all sorts of other .h files.
>
> Another problem I often face with symbolic names is the difficulty of
> figuring out what the numerical values really are (for debugging),
> especially when .h files are in different subtrees from the files that
> use the definitions, and when they use multiple macro levels and fancy
> features like concatenation. Sometimes I think it's clearer just to
> write the number and use a comment to say what it is.
Both comments apply just as well to ordinary C code, and I don't think
anyone would seriously suggest just using comments instead for C code.
Is there a way to ask CPP to evaluate a macro in the context of the
input file, rather than produce normal output? If not, I guess you
could make a tool that creates a wrapper file that includes the main
file and then evaluates the symbol you want.
-Scott
next prev parent reply other threads:[~2012-10-10 0:04 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-28 21:25 [PATCH] dtc: import latest upstream dtc Stephen Warren
2012-09-29 21:06 ` Jon Loeliger
2012-10-01 16:09 ` Rob Herring
2012-10-01 16:13 ` Stephen Warren
2012-10-01 16:13 ` Stephen Warren
2012-10-01 17:56 ` Rob Herring
2012-10-01 17:56 ` Rob Herring
2012-10-01 18:33 ` Stephen Warren
2012-10-01 18:39 ` Jon Loeliger
2012-10-01 18:39 ` Jon Loeliger
2012-10-09 21:16 ` Stephen Warren
2012-10-09 21:16 ` Stephen Warren
2012-10-09 23:20 ` Mitch Bradley
2012-10-09 23:20 ` Mitch Bradley
2012-10-10 0:04 ` Scott Wood [this message]
2012-10-10 0:04 ` Scott Wood
2012-10-10 4:43 ` Warner Losh
2012-10-10 7:24 ` David Gibson
2012-10-10 14:41 ` Warner Losh
2012-10-10 14:41 ` Warner Losh
2012-10-10 23:06 ` David Gibson
2012-10-10 15:16 ` Stephen Warren
2012-10-10 15:33 ` Rob Herring
2012-10-10 16:19 ` Stephen Warren
2012-10-10 17:18 ` Rob Herring
2012-10-10 18:42 ` Stephen Warren
2012-10-10 23:16 ` David Gibson
2012-10-10 23:16 ` David Gibson
2012-10-11 1:42 ` Mitch Bradley
2012-10-11 5:11 ` David Gibson
2012-10-11 5:11 ` David Gibson
2012-10-10 23:09 ` David Gibson
2012-10-10 23:09 ` David Gibson
2012-10-10 15:15 ` Stephen Warren
2012-10-10 15:15 ` Stephen Warren
2012-10-10 16:09 ` Scott Wood
2012-10-10 16:09 ` Scott Wood
2012-10-10 16:22 ` Stephen Warren
2012-10-10 23:18 ` David Gibson
2012-10-12 17:24 ` Stephen Warren
2012-10-13 6:24 ` David Gibson
2012-10-13 6:24 ` David Gibson
2012-10-13 13:42 ` Segher Boessenkool
2012-10-13 13:42 ` Segher Boessenkool
2012-10-14 0:16 ` David Gibson
2012-10-14 0:16 ` David Gibson
2012-10-10 17:09 ` Rob Herring
2012-10-10 18:23 ` Mitch Bradley
2012-10-10 18:23 ` Mitch Bradley
2012-10-10 18:45 ` Stephen Warren
2012-10-10 18:45 ` Stephen Warren
2012-10-10 18:56 ` Mitch Bradley
2012-10-10 18:56 ` Mitch Bradley
2012-10-11 0:14 ` David Gibson
2012-10-10 23:54 ` David Gibson
2012-10-10 18:40 ` Stephen Warren
2012-10-10 18:52 ` Mitch Bradley
2012-10-10 18:52 ` Mitch Bradley
2012-10-01 18:02 ` Jon Loeliger
2012-10-01 18:02 ` Jon Loeliger
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